/****************************************************************************** ** This file is an amalgamation of many separate C source files from SQLite ** version 3.5.9. By combining all the individual C code files into this ** single large file, the entire code can be compiled as a one translation ** unit. This allows many compilers to do optimizations that would not be ** possible if the files were compiled separately. Performance improvements ** of 5% are more are commonly seen when SQLite is compiled as a single ** translation unit. ** ** This file is all you need to compile SQLite. To use SQLite in other ** programs, you need this file and the "sqlite3.h" header file that defines ** the programming interface to the SQLite library. (If you do not have ** the "sqlite3.h" header file at hand, you will find a copy in the first ** 5638 lines past this header comment.) Additional code files may be ** needed if you want a wrapper to interface SQLite with your choice of ** programming language. The code for the "sqlite3" command-line shell ** is also in a separate file. This file contains only code for the core ** SQLite library. ** ** This amalgamation was generated on 2008-05-14 16:30:52 UTC. */ #define SQLITE_CORE 1 #define SQLITE_AMALGAMATION 1 #ifndef SQLITE_PRIVATE # define SQLITE_PRIVATE static #endif #ifndef SQLITE_API # define SQLITE_API #endif /************** Begin file sqliteInt.h ***************************************/ /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** Internal interface definitions for SQLite. ** ** @(#) $Id: sqliteInt.h,v 1.704 2008/05/13 13:27:34 drh Exp $ */ #ifndef _SQLITEINT_H_ #define _SQLITEINT_H_ /* ** Include the configuration header output by 'configure' if we're using the ** autoconf-based build */ #ifdef _HAVE_SQLITE_CONFIG_H #include "config.h" #endif /************** Include sqliteLimit.h in the middle of sqliteInt.h ***********/ /************** Begin file sqliteLimit.h *************************************/ /* ** 2007 May 7 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file defines various limits of what SQLite can process. ** ** @(#) $Id: sqliteLimit.h,v 1.8 2008/03/26 15:56:22 drh Exp $ */ /* ** The maximum length of a TEXT or BLOB in bytes. This also ** limits the size of a row in a table or index. ** ** The hard limit is the ability of a 32-bit signed integer ** to count the size: 2^31-1 or 2147483647. */ #ifndef SQLITE_MAX_LENGTH # define SQLITE_MAX_LENGTH 1000000000 #endif /* ** This is the maximum number of ** ** * Columns in a table ** * Columns in an index ** * Columns in a view ** * Terms in the SET clause of an UPDATE statement ** * Terms in the result set of a SELECT statement ** * Terms in the GROUP BY or ORDER BY clauses of a SELECT statement. ** * Terms in the VALUES clause of an INSERT statement ** ** The hard upper limit here is 32676. Most database people will ** tell you that in a well-normalized database, you usually should ** not have more than a dozen or so columns in any table. And if ** that is the case, there is no point in having more than a few ** dozen values in any of the other situations described above. */ #ifndef SQLITE_MAX_COLUMN # define SQLITE_MAX_COLUMN 2000 #endif /* ** The maximum length of a single SQL statement in bytes. ** ** It used to be the case that setting this value to zero would ** turn the limit off. That is no longer true. It is not possible ** to turn this limit off. */ #ifndef SQLITE_MAX_SQL_LENGTH # define SQLITE_MAX_SQL_LENGTH 1000000000 #endif /* ** The maximum depth of an expression tree. This is limited to ** some extent by SQLITE_MAX_SQL_LENGTH. But sometime you might ** want to place more severe limits on the complexity of an ** expression. ** ** A value of 0 used to mean that the limit was not enforced. ** But that is no longer true. The limit is now strictly enforced ** at all times. */ #ifndef SQLITE_MAX_EXPR_DEPTH # define SQLITE_MAX_EXPR_DEPTH 1000 #endif /* ** The maximum number of terms in a compound SELECT statement. ** The code generator for compound SELECT statements does one ** level of recursion for each term. A stack overflow can result ** if the number of terms is too large. In practice, most SQL ** never has more than 3 or 4 terms. Use a value of 0 to disable ** any limit on the number of terms in a compount SELECT. */ #ifndef SQLITE_MAX_COMPOUND_SELECT # define SQLITE_MAX_COMPOUND_SELECT 500 #endif /* ** The maximum number of opcodes in a VDBE program. ** Not currently enforced. */ #ifndef SQLITE_MAX_VDBE_OP # define SQLITE_MAX_VDBE_OP 25000 #endif /* ** The maximum number of arguments to an SQL function. */ #ifndef SQLITE_MAX_FUNCTION_ARG # define SQLITE_MAX_FUNCTION_ARG 100 #endif /* ** The maximum number of in-memory pages to use for the main database ** table and for temporary tables. The SQLITE_DEFAULT_CACHE_SIZE */ #ifndef SQLITE_DEFAULT_CACHE_SIZE # define SQLITE_DEFAULT_CACHE_SIZE 2000 #endif #ifndef SQLITE_DEFAULT_TEMP_CACHE_SIZE # define SQLITE_DEFAULT_TEMP_CACHE_SIZE 500 #endif /* ** The maximum number of attached databases. This must be between 0 ** and 30. The upper bound on 30 is because a 32-bit integer bitmap ** is used internally to track attached databases. */ #ifndef SQLITE_MAX_ATTACHED # define SQLITE_MAX_ATTACHED 10 #endif /* ** The maximum value of a ?nnn wildcard that the parser will accept. */ #ifndef SQLITE_MAX_VARIABLE_NUMBER # define SQLITE_MAX_VARIABLE_NUMBER 999 #endif /* Maximum page size. The upper bound on this value is 32768. This a limit ** imposed by the necessity of storing the value in a 2-byte unsigned integer ** and the fact that the page size must be a power of 2. */ #ifndef SQLITE_MAX_PAGE_SIZE # define SQLITE_MAX_PAGE_SIZE 32768 #endif /* ** The default size of a database page. */ #ifndef SQLITE_DEFAULT_PAGE_SIZE # define SQLITE_DEFAULT_PAGE_SIZE 1024 #endif #if SQLITE_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE # undef SQLITE_DEFAULT_PAGE_SIZE # define SQLITE_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE #endif /* ** Ordinarily, if no value is explicitly provided, SQLite creates databases ** with page size SQLITE_DEFAULT_PAGE_SIZE. However, based on certain ** device characteristics (sector-size and atomic write() support), ** SQLite may choose a larger value. This constant is the maximum value ** SQLite will choose on its own. */ #ifndef SQLITE_MAX_DEFAULT_PAGE_SIZE # define SQLITE_MAX_DEFAULT_PAGE_SIZE 8192 #endif #if SQLITE_MAX_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE # undef SQLITE_MAX_DEFAULT_PAGE_SIZE # define SQLITE_MAX_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE #endif /* ** Maximum number of pages in one database file. ** ** This is really just the default value for the max_page_count pragma. ** This value can be lowered (or raised) at run-time using that the ** max_page_count macro. */ #ifndef SQLITE_MAX_PAGE_COUNT # define SQLITE_MAX_PAGE_COUNT 1073741823 #endif /* ** Maximum length (in bytes) of the pattern in a LIKE or GLOB ** operator. */ #ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH # define SQLITE_MAX_LIKE_PATTERN_LENGTH 50000 #endif /************** End of sqliteLimit.h *****************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /* Needed for various definitions... */ #define _GNU_SOURCE /* ** Include standard header files as necessary */ #ifdef HAVE_STDINT_H #include #endif #ifdef HAVE_INTTYPES_H #include #endif /* ** A macro used to aid in coverage testing. When doing coverage ** testing, the condition inside the argument must be evaluated ** both true and false in order to get full branch coverage. ** This macro can be inserted to ensure adequate test coverage ** in places where simple condition/decision coverage is inadequate. */ #ifdef SQLITE_COVERAGE_TEST SQLITE_PRIVATE void sqlite3Coverage(int); # define testcase(X) if( X ){ sqlite3Coverage(__LINE__); } #else # define testcase(X) #endif /* ** The macro unlikely() is a hint that surrounds a boolean ** expression that is usually false. Macro likely() surrounds ** a boolean expression that is usually true. GCC is able to ** use these hints to generate better code, sometimes. */ #if defined(__GNUC__) && 0 # define likely(X) __builtin_expect((X),1) # define unlikely(X) __builtin_expect((X),0) #else # define likely(X) !!(X) # define unlikely(X) !!(X) #endif /* ** These #defines should enable >2GB file support on Posix if the ** underlying operating system supports it. If the OS lacks ** large file support, or if the OS is windows, these should be no-ops. ** ** Ticket #2739: The _LARGEFILE_SOURCE macro must appear before any ** system #includes. Hence, this block of code must be the very first ** code in all source files. ** ** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch ** on the compiler command line. This is necessary if you are compiling ** on a recent machine (ex: RedHat 7.2) but you want your code to work ** on an older machine (ex: RedHat 6.0). If you compile on RedHat 7.2 ** without this option, LFS is enable. But LFS does not exist in the kernel ** in RedHat 6.0, so the code won't work. Hence, for maximum binary ** portability you should omit LFS. ** ** Similar is true for MacOS. LFS is only supported on MacOS 9 and later. */ #ifndef SQLITE_DISABLE_LFS # define _LARGE_FILE 1 # ifndef _FILE_OFFSET_BITS # define _FILE_OFFSET_BITS 64 # endif # define _LARGEFILE_SOURCE 1 #endif /* ** The SQLITE_THREADSAFE macro must be defined as either 0 or 1. ** Older versions of SQLite used an optional THREADSAFE macro. ** We support that for legacy */ #if !defined(SQLITE_THREADSAFE) #if defined(THREADSAFE) # define SQLITE_THREADSAFE THREADSAFE #else # define SQLITE_THREADSAFE 1 #endif #endif /* ** Exactly one of the following macros must be defined in order to ** specify which memory allocation subsystem to use. ** ** SQLITE_SYSTEM_MALLOC // Use normal system malloc() ** SQLITE_MEMDEBUG // Debugging version of system malloc() ** SQLITE_MEMORY_SIZE // internal allocator #1 ** SQLITE_MMAP_HEAP_SIZE // internal mmap() allocator ** SQLITE_POW2_MEMORY_SIZE // internal power-of-two allocator ** ** If none of the above are defined, then set SQLITE_SYSTEM_MALLOC as ** the default. */ #if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\ defined(SQLITE_MEMORY_SIZE)+defined(SQLITE_MMAP_HEAP_SIZE)+\ defined(SQLITE_POW2_MEMORY_SIZE)>1 # error "At most one of the following compile-time configuration options\ is allows: SQLITE_SYSTEM_MALLOC, SQLITE_MEMDEBUG, SQLITE_MEMORY_SIZE,\ SQLITE_MMAP_HEAP_SIZE, SQLITE_POW2_MEMORY_SIZE" #endif #if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\ defined(SQLITE_MEMORY_SIZE)+defined(SQLITE_MMAP_HEAP_SIZE)+\ defined(SQLITE_POW2_MEMORY_SIZE)==0 # define SQLITE_SYSTEM_MALLOC 1 #endif /* ** If SQLITE_MALLOC_SOFT_LIMIT is defined, then try to keep the ** sizes of memory allocations below this value where possible. */ #if defined(SQLITE_POW2_MEMORY_SIZE) && !defined(SQLITE_MALLOC_SOFT_LIMIT) # define SQLITE_MALLOC_SOFT_LIMIT 1024 #endif /* ** We need to define _XOPEN_SOURCE as follows in order to enable ** recursive mutexes on most unix systems. But Mac OS X is different. ** The _XOPEN_SOURCE define causes problems for Mac OS X we are told, ** so it is omitted there. See ticket #2673. ** ** Later we learn that _XOPEN_SOURCE is poorly or incorrectly ** implemented on some systems. So we avoid defining it at all ** if it is already defined or if it is unneeded because we are ** not doing a threadsafe build. Ticket #2681. ** ** See also ticket #2741. */ #if !defined(_XOPEN_SOURCE) && !defined(__DARWIN__) && !defined(__APPLE__) && SQLITE_THREADSAFE # define _XOPEN_SOURCE 500 /* Needed to enable pthread recursive mutexes */ #endif #if defined(SQLITE_TCL) || defined(TCLSH) # include #endif /* ** Many people are failing to set -DNDEBUG=1 when compiling SQLite. ** Setting NDEBUG makes the code smaller and run faster. So the following ** lines are added to automatically set NDEBUG unless the -DSQLITE_DEBUG=1 ** option is set. Thus NDEBUG becomes an opt-in rather than an opt-out ** feature. */ #if !defined(NDEBUG) && !defined(SQLITE_DEBUG) # define NDEBUG 1 #endif /************** Include sqlite3.h in the middle of sqliteInt.h ***************/ /************** Begin file sqlite3.h *****************************************/ /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the SQLite library ** presents to client programs. If a C-function, structure, datatype, ** or constant definition does not appear in this file, then it is ** not a published API of SQLite, is subject to change without ** notice, and should not be referenced by programs that use SQLite. ** ** Some of the definitions that are in this file are marked as ** "experimental". Experimental interfaces are normally new ** features recently added to SQLite. We do not anticipate changes ** to experimental interfaces but reserve to make minor changes if ** experience from use "in the wild" suggest such changes are prudent. ** ** The official C-language API documentation for SQLite is derived ** from comments in this file. This file is the authoritative source ** on how SQLite interfaces are suppose to operate. ** ** The name of this file under configuration management is "sqlite.h.in". ** The makefile makes some minor changes to this file (such as inserting ** the version number) and changes its name to "sqlite3.h" as ** part of the build process. ** ** @(#) $Id: sqlite.h.in,v 1.312 2008/05/12 12:39:56 drh Exp $ */ #ifndef _SQLITE3_H_ #define _SQLITE3_H_ #include /* Needed for the definition of va_list */ /* ** Make sure we can call this stuff from C++. */ #if 0 extern "C" { #endif /* ** Add the ability to override 'extern' */ #ifndef SQLITE_EXTERN # define SQLITE_EXTERN extern #endif /* ** Make sure these symbols where not defined by some previous header ** file. */ #ifdef SQLITE_VERSION # undef SQLITE_VERSION #endif #ifdef SQLITE_VERSION_NUMBER # undef SQLITE_VERSION_NUMBER #endif /* ** CAPI3REF: Compile-Time Library Version Numbers {F10010} ** ** The SQLITE_VERSION and SQLITE_VERSION_NUMBER #defines in ** the sqlite3.h file specify the version of SQLite with which ** that header file is associated. ** ** The "version" of SQLite is a string of the form "X.Y.Z". ** The phrase "alpha" or "beta" might be appended after the Z. ** The X value is major version number always 3 in SQLite3. ** The X value only changes when backwards compatibility is ** broken and we intend to never break ** backwards compatibility. The Y value is the minor version ** number and only changes when ** there are major feature enhancements that are forwards compatible ** but not backwards compatible. The Z value is release number ** and is incremented with ** each release but resets back to 0 when Y is incremented. ** ** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()]. ** ** INVARIANTS: ** ** {F10011} The SQLITE_VERSION #define in the sqlite3.h header file ** evaluates to a string literal that is the SQLite version ** with which the header file is associated. ** ** {F10014} The SQLITE_VERSION_NUMBER #define resolves to an integer ** with the value (X*1000000 + Y*1000 + Z) where X, Y, and ** Z are the major version, minor version, and release number. */ #define SQLITE_VERSION "3.5.9" #define SQLITE_VERSION_NUMBER 3005009 /* ** CAPI3REF: Run-Time Library Version Numbers {F10020} ** KEYWORDS: sqlite3_version ** ** These features provide the same information as the [SQLITE_VERSION] ** and [SQLITE_VERSION_NUMBER] #defines in the header, but are associated ** with the library instead of the header file. Cautious programmers might ** include a check in their application to verify that ** sqlite3_libversion_number() always returns the value ** [SQLITE_VERSION_NUMBER]. ** ** The sqlite3_libversion() function returns the same information as is ** in the sqlite3_version[] string constant. The function is provided ** for use in DLLs since DLL users usually do not have direct access to string ** constants within the DLL. ** ** INVARIANTS: ** ** {F10021} The [sqlite3_libversion_number()] interface returns an integer ** equal to [SQLITE_VERSION_NUMBER]. ** ** {F10022} The [sqlite3_version] string constant contains the text of the ** [SQLITE_VERSION] string. ** ** {F10023} The [sqlite3_libversion()] function returns ** a pointer to the [sqlite3_version] string constant. */ SQLITE_API const char sqlite3_version[]; SQLITE_API const char *sqlite3_libversion(void); SQLITE_API int sqlite3_libversion_number(void); /* ** CAPI3REF: Test To See If The Library Is Threadsafe {F10100} ** ** SQLite can be compiled with or without mutexes. When ** the SQLITE_THREADSAFE C preprocessor macro is true, mutexes ** are enabled and SQLite is threadsafe. When that macro is false, ** the mutexes are omitted. Without the mutexes, it is not safe ** to use SQLite from more than one thread. ** ** There is a measurable performance penalty for enabling mutexes. ** So if speed is of utmost importance, it makes sense to disable ** the mutexes. But for maximum safety, mutexes should be enabled. ** The default behavior is for mutexes to be enabled. ** ** This interface can be used by a program to make sure that the ** version of SQLite that it is linking against was compiled with ** the desired setting of the SQLITE_THREADSAFE macro. ** ** INVARIANTS: ** ** {F10101} The [sqlite3_threadsafe()] function returns nonzero if ** SQLite was compiled with its mutexes enabled or zero ** if SQLite was compiled with mutexes disabled. */ SQLITE_API int sqlite3_threadsafe(void); /* ** CAPI3REF: Database Connection Handle {F12000} ** KEYWORDS: {database connection} {database connections} ** ** Each open SQLite database is represented by pointer to an instance of the ** opaque structure named "sqlite3". It is useful to think of an sqlite3 ** pointer as an object. The [sqlite3_open()], [sqlite3_open16()], and ** [sqlite3_open_v2()] interfaces are its constructors ** and [sqlite3_close()] is its destructor. There are many other interfaces ** (such as [sqlite3_prepare_v2()], [sqlite3_create_function()], and ** [sqlite3_busy_timeout()] to name but three) that are methods on this ** object. */ typedef struct sqlite3 sqlite3; /* ** CAPI3REF: 64-Bit Integer Types {F10200} ** KEYWORDS: sqlite_int64 sqlite_uint64 ** ** Because there is no cross-platform way to specify 64-bit integer types ** SQLite includes typedefs for 64-bit signed and unsigned integers. ** ** The sqlite3_int64 and sqlite3_uint64 are the preferred type ** definitions. The sqlite_int64 and sqlite_uint64 types are ** supported for backwards compatibility only. ** ** INVARIANTS: ** ** {F10201} The [sqlite_int64] and [sqlite3_int64] types specify a ** 64-bit signed integer. ** ** {F10202} The [sqlite_uint64] and [sqlite3_uint64] types specify ** a 64-bit unsigned integer. */ #ifdef SQLITE_INT64_TYPE typedef SQLITE_INT64_TYPE sqlite_int64; typedef unsigned SQLITE_INT64_TYPE sqlite_uint64; #elif defined(_MSC_VER) typedef __int64 sqlite_int64; typedef unsigned __int64 sqlite_uint64; #else typedef long long int sqlite_int64; typedef unsigned long long int sqlite_uint64; #endif typedef sqlite_int64 sqlite3_int64; typedef sqlite_uint64 sqlite3_uint64; /* ** If compiling for a processor that lacks floating point support, ** substitute integer for floating-point */ #ifdef SQLITE_OMIT_FLOATING_POINT # define double sqlite3_int64 #endif /* ** CAPI3REF: Closing A Database Connection {F12010} ** ** This routine is the destructor for the [sqlite3] object. ** ** Applications should [sqlite3_finalize | finalize] all ** [prepared statements] and ** [sqlite3_blob_close | close] all [sqlite3_blob | BLOBs] ** associated with the [sqlite3] object prior ** to attempting to close the [sqlite3] object. ** ** What happens to pending transactions? Are they ** rolled back, or abandoned? ** ** INVARIANTS: ** ** {F12011} The [sqlite3_close()] interface destroys an [sqlite3] object ** allocated by a prior call to [sqlite3_open()], ** [sqlite3_open16()], or [sqlite3_open_v2()]. ** ** {F12012} The [sqlite3_close()] function releases all memory used by the ** connection and closes all open files. ** ** {F12013} If the database connection contains ** [prepared statements] that have not been ** finalized by [sqlite3_finalize()], then [sqlite3_close()] ** returns [SQLITE_BUSY] and leaves the connection open. ** ** {F12014} Giving sqlite3_close() a NULL pointer is a harmless no-op. ** ** LIMITATIONS: ** ** {U12015} The parameter to [sqlite3_close()] must be an [sqlite3] object ** pointer previously obtained from [sqlite3_open()] or the ** equivalent, or NULL. ** ** {U12016} The parameter to [sqlite3_close()] must not have been previously ** closed. */ SQLITE_API int sqlite3_close(sqlite3 *); /* ** The type for a callback function. ** This is legacy and deprecated. It is included for historical ** compatibility and is not documented. */ typedef int (*sqlite3_callback)(void*,int,char**, char**); /* ** CAPI3REF: One-Step Query Execution Interface {F12100} ** ** The sqlite3_exec() interface is a convenient way of running ** one or more SQL statements without a lot of C code. The ** SQL statements are passed in as the second parameter to ** sqlite3_exec(). The statements are evaluated one by one ** until either an error or an interrupt is encountered or ** until they are all done. The 3rd parameter is an optional ** callback that is invoked once for each row of any query results ** produced by the SQL statements. The 5th parameter tells where ** to write any error messages. ** ** The sqlite3_exec() interface is implemented in terms of ** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()]. ** The sqlite3_exec() routine does nothing that cannot be done ** by [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()]. ** The sqlite3_exec() is just a convenient wrapper. ** ** INVARIANTS: ** ** {F12101} The [sqlite3_exec()] interface evaluates zero or more UTF-8 ** encoded, semicolon-separated, SQL statements in the ** zero-terminated string of its 2nd parameter within the ** context of the [sqlite3] object given in the 1st parameter. ** ** {F12104} The return value of [sqlite3_exec()] is SQLITE_OK if all ** SQL statements run successfully. ** ** {F12105} The return value of [sqlite3_exec()] is an appropriate ** non-zero error code if any SQL statement fails. ** ** {F12107} If one or more of the SQL statements handed to [sqlite3_exec()] ** return results and the 3rd parameter is not NULL, then ** the callback function specified by the 3rd parameter is ** invoked once for each row of result. ** ** {F12110} If the callback returns a non-zero value then [sqlite3_exec()] ** will aborted the SQL statement it is currently evaluating, ** skip all subsequent SQL statements, and return [SQLITE_ABORT]. ** What happens to *errmsg here? Does the result code for ** sqlite3_errcode() get set? ** ** {F12113} The [sqlite3_exec()] routine will pass its 4th parameter through ** as the 1st parameter of the callback. ** ** {F12116} The [sqlite3_exec()] routine sets the 2nd parameter of its ** callback to be the number of columns in the current row of ** result. ** ** {F12119} The [sqlite3_exec()] routine sets the 3rd parameter of its ** callback to be an array of pointers to strings holding the ** values for each column in the current result set row as ** obtained from [sqlite3_column_text()]. ** ** {F12122} The [sqlite3_exec()] routine sets the 4th parameter of its ** callback to be an array of pointers to strings holding the ** names of result columns as obtained from [sqlite3_column_name()]. ** ** {F12125} If the 3rd parameter to [sqlite3_exec()] is NULL then ** [sqlite3_exec()] never invokes a callback. All query ** results are silently discarded. ** ** {F12128} If an error occurs while parsing or evaluating any of the SQL ** statements handed to [sqlite3_exec()] then [sqlite3_exec()] will ** return an [error code] other than [SQLITE_OK]. ** ** {F12131} If an error occurs while parsing or evaluating any of the SQL ** handed to [sqlite3_exec()] and if the 5th parameter (errmsg) ** to [sqlite3_exec()] is not NULL, then an error message is ** allocated using the equivalent of [sqlite3_mprintf()] and ** *errmsg is made to point to that message. ** ** {F12134} The [sqlite3_exec()] routine does not change the value of ** *errmsg if errmsg is NULL or if there are no errors. ** ** {F12137} The [sqlite3_exec()] function sets the error code and message ** accessible via [sqlite3_errcode()], [sqlite3_errmsg()], and ** [sqlite3_errmsg16()]. ** ** LIMITATIONS: ** ** {U12141} The first parameter to [sqlite3_exec()] must be an valid and open ** [database connection]. ** ** {U12142} The database connection must not be closed while ** [sqlite3_exec()] is running. ** ** {U12143} The calling function is should use [sqlite3_free()] to free ** the memory that *errmsg is left pointing at once the error ** message is no longer needed. ** ** {U12145} The SQL statement text in the 2nd parameter to [sqlite3_exec()] ** must remain unchanged while [sqlite3_exec()] is running. */ SQLITE_API int sqlite3_exec( sqlite3*, /* An open database */ const char *sql, /* SQL to be evaluted */ int (*callback)(void*,int,char**,char**), /* Callback function */ void *, /* 1st argument to callback */ char **errmsg /* Error msg written here */ ); /* ** CAPI3REF: Result Codes {F10210} ** KEYWORDS: SQLITE_OK {error code} {error codes} ** ** Many SQLite functions return an integer result code from the set shown ** here in order to indicates success or failure. ** ** See also: [SQLITE_IOERR_READ | extended result codes] */ #define SQLITE_OK 0 /* Successful result */ /* beginning-of-error-codes */ #define SQLITE_ERROR 1 /* SQL error or missing database */ #define SQLITE_INTERNAL 2 /* Internal logic error in SQLite */ #define SQLITE_PERM 3 /* Access permission denied */ #define SQLITE_ABORT 4 /* Callback routine requested an abort */ #define SQLITE_BUSY 5 /* The database file is locked */ #define SQLITE_LOCKED 6 /* A table in the database is locked */ #define SQLITE_NOMEM 7 /* A malloc() failed */ #define SQLITE_READONLY 8 /* Attempt to write a readonly database */ #define SQLITE_INTERRUPT 9 /* Operation terminated by sqlite3_interrupt()*/ #define SQLITE_IOERR 10 /* Some kind of disk I/O error occurred */ #define SQLITE_CORRUPT 11 /* The database disk image is malformed */ #define SQLITE_NOTFOUND 12 /* NOT USED. Table or record not found */ #define SQLITE_FULL 13 /* Insertion failed because database is full */ #define SQLITE_CANTOPEN 14 /* Unable to open the database file */ #define SQLITE_PROTOCOL 15 /* NOT USED. Database lock protocol error */ #define SQLITE_EMPTY 16 /* Database is empty */ #define SQLITE_SCHEMA 17 /* The database schema changed */ #define SQLITE_TOOBIG 18 /* String or BLOB exceeds size limit */ #define SQLITE_CONSTRAINT 19 /* Abort due to constraint violation */ #define SQLITE_MISMATCH 20 /* Data type mismatch */ #define SQLITE_MISUSE 21 /* Library used incorrectly */ #define SQLITE_NOLFS 22 /* Uses OS features not supported on host */ #define SQLITE_AUTH 23 /* Authorization denied */ #define SQLITE_FORMAT 24 /* Auxiliary database format error */ #define SQLITE_RANGE 25 /* 2nd parameter to sqlite3_bind out of range */ #define SQLITE_NOTADB 26 /* File opened that is not a database file */ #define SQLITE_ROW 100 /* sqlite3_step() has another row ready */ #define SQLITE_DONE 101 /* sqlite3_step() has finished executing */ /* end-of-error-codes */ /* ** CAPI3REF: Extended Result Codes {F10220} ** KEYWORDS: {extended error code} {extended error codes} ** KEYWORDS: {extended result codes} ** ** In its default configuration, SQLite API routines return one of 26 integer ** [SQLITE_OK | result codes]. However, experience has shown that ** many of these result codes are too course-grained. They do not provide as ** much information about problems as programmers might like. In an effort to ** address this, newer versions of SQLite (version 3.3.8 and later) include ** support for additional result codes that provide more detailed information ** about errors. The extended result codes are enabled or disabled ** for each database connection using the [sqlite3_extended_result_codes()] ** API. ** ** Some of the available extended result codes are listed here. ** One may expect the number of extended result codes will be expand ** over time. Software that uses extended result codes should expect ** to see new result codes in future releases of SQLite. ** ** The SQLITE_OK result code will never be extended. It will always ** be exactly zero. ** ** INVARIANTS: ** ** {F10223} The symbolic name for an extended result code always contains ** a related primary result code as a prefix. ** ** {F10224} Primary result code names contain a single "_" character. ** ** {F10225} Extended result code names contain two or more "_" characters. ** ** {F10226} The numeric value of an extended result code contains the ** numeric value of its corresponding primary result code in ** its least significant 8 bits. */ #define SQLITE_IOERR_READ (SQLITE_IOERR | (1<<8)) #define SQLITE_IOERR_SHORT_READ (SQLITE_IOERR | (2<<8)) #define SQLITE_IOERR_WRITE (SQLITE_IOERR | (3<<8)) #define SQLITE_IOERR_FSYNC (SQLITE_IOERR | (4<<8)) #define SQLITE_IOERR_DIR_FSYNC (SQLITE_IOERR | (5<<8)) #define SQLITE_IOERR_TRUNCATE (SQLITE_IOERR | (6<<8)) #define SQLITE_IOERR_FSTAT (SQLITE_IOERR | (7<<8)) #define SQLITE_IOERR_UNLOCK (SQLITE_IOERR | (8<<8)) #define SQLITE_IOERR_RDLOCK (SQLITE_IOERR | (9<<8)) #define SQLITE_IOERR_DELETE (SQLITE_IOERR | (10<<8)) #define SQLITE_IOERR_BLOCKED (SQLITE_IOERR | (11<<8)) #define SQLITE_IOERR_NOMEM (SQLITE_IOERR | (12<<8)) /* ** CAPI3REF: Flags For File Open Operations {F10230} ** ** These bit values are intended for use in the ** 3rd parameter to the [sqlite3_open_v2()] interface and ** in the 4th parameter to the xOpen method of the ** [sqlite3_vfs] object. */ #define SQLITE_OPEN_READONLY 0x00000001 #define SQLITE_OPEN_READWRITE 0x00000002 #define SQLITE_OPEN_CREATE 0x00000004 #define SQLITE_OPEN_DELETEONCLOSE 0x00000008 #define SQLITE_OPEN_EXCLUSIVE 0x00000010 #define SQLITE_OPEN_MAIN_DB 0x00000100 #define SQLITE_OPEN_TEMP_DB 0x00000200 #define SQLITE_OPEN_TRANSIENT_DB 0x00000400 #define SQLITE_OPEN_MAIN_JOURNAL 0x00000800 #define SQLITE_OPEN_TEMP_JOURNAL 0x00001000 #define SQLITE_OPEN_SUBJOURNAL 0x00002000 #define SQLITE_OPEN_MASTER_JOURNAL 0x00004000 /* ** CAPI3REF: Device Characteristics {F10240} ** ** The xDeviceCapabilities method of the [sqlite3_io_methods] ** object returns an integer which is a vector of the these ** bit values expressing I/O characteristics of the mass storage ** device that holds the file that the [sqlite3_io_methods] ** refers to. ** ** The SQLITE_IOCAP_ATOMIC property means that all writes of ** any size are atomic. The SQLITE_IOCAP_ATOMICnnn values ** mean that writes of blocks that are nnn bytes in size and ** are aligned to an address which is an integer multiple of ** nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means ** that when data is appended to a file, the data is appended ** first then the size of the file is extended, never the other ** way around. The SQLITE_IOCAP_SEQUENTIAL property means that ** information is written to disk in the same order as calls ** to xWrite(). */ #define SQLITE_IOCAP_ATOMIC 0x00000001 #define SQLITE_IOCAP_ATOMIC512 0x00000002 #define SQLITE_IOCAP_ATOMIC1K 0x00000004 #define SQLITE_IOCAP_ATOMIC2K 0x00000008 #define SQLITE_IOCAP_ATOMIC4K 0x00000010 #define SQLITE_IOCAP_ATOMIC8K 0x00000020 #define SQLITE_IOCAP_ATOMIC16K 0x00000040 #define SQLITE_IOCAP_ATOMIC32K 0x00000080 #define SQLITE_IOCAP_ATOMIC64K 0x00000100 #define SQLITE_IOCAP_SAFE_APPEND 0x00000200 #define SQLITE_IOCAP_SEQUENTIAL 0x00000400 /* ** CAPI3REF: File Locking Levels {F10250} ** ** SQLite uses one of these integer values as the second ** argument to calls it makes to the xLock() and xUnlock() methods ** of an [sqlite3_io_methods] object. */ #define SQLITE_LOCK_NONE 0 #define SQLITE_LOCK_SHARED 1 #define SQLITE_LOCK_RESERVED 2 #define SQLITE_LOCK_PENDING 3 #define SQLITE_LOCK_EXCLUSIVE 4 /* ** CAPI3REF: Synchronization Type Flags {F10260} ** ** When SQLite invokes the xSync() method of an ** [sqlite3_io_methods] object it uses a combination of ** these integer values as the second argument. ** ** When the SQLITE_SYNC_DATAONLY flag is used, it means that the ** sync operation only needs to flush data to mass storage. Inode ** information need not be flushed. The SQLITE_SYNC_NORMAL flag means ** to use normal fsync() semantics. The SQLITE_SYNC_FULL flag means ** to use Mac OS-X style fullsync instead of fsync(). */ #define SQLITE_SYNC_NORMAL 0x00002 #define SQLITE_SYNC_FULL 0x00003 #define SQLITE_SYNC_DATAONLY 0x00010 /* ** CAPI3REF: OS Interface Open File Handle {F11110} ** ** An [sqlite3_file] object represents an open file in the OS ** interface layer. Individual OS interface implementations will ** want to subclass this object by appending additional fields ** for their own use. The pMethods entry is a pointer to an ** [sqlite3_io_methods] object that defines methods for performing ** I/O operations on the open file. */ typedef struct sqlite3_file sqlite3_file; struct sqlite3_file { const struct sqlite3_io_methods *pMethods; /* Methods for an open file */ }; /* ** CAPI3REF: OS Interface File Virtual Methods Object {F11120} ** ** Every file opened by the [sqlite3_vfs] xOpen method contains a pointer to ** an instance of this object. This object defines the ** methods used to perform various operations against the open file. ** ** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or ** [SQLITE_SYNC_FULL]. The first choice is the normal fsync(). * The second choice is an ** OS-X style fullsync. The SQLITE_SYNC_DATA flag may be ORed in to ** indicate that only the data of the file and not its inode needs to be ** synced. ** ** The integer values to xLock() and xUnlock() are one of **
    **
  • [SQLITE_LOCK_NONE], **
  • [SQLITE_LOCK_SHARED], **
  • [SQLITE_LOCK_RESERVED], **
  • [SQLITE_LOCK_PENDING], or **
  • [SQLITE_LOCK_EXCLUSIVE]. **
** xLock() increases the lock. xUnlock() decreases the lock. ** The xCheckReservedLock() method looks ** to see if any database connection, either in this ** process or in some other process, is holding an RESERVED, ** PENDING, or EXCLUSIVE lock on the file. It returns true ** if such a lock exists and false if not. ** ** The xFileControl() method is a generic interface that allows custom ** VFS implementations to directly control an open file using the ** [sqlite3_file_control()] interface. The second "op" argument ** is an integer opcode. The third ** argument is a generic pointer which is intended to be a pointer ** to a structure that may contain arguments or space in which to ** write return values. Potential uses for xFileControl() might be ** functions to enable blocking locks with timeouts, to change the ** locking strategy (for example to use dot-file locks), to inquire ** about the status of a lock, or to break stale locks. The SQLite ** core reserves opcodes less than 100 for its own use. ** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available. ** Applications that define a custom xFileControl method should use opcodes ** greater than 100 to avoid conflicts. ** ** The xSectorSize() method returns the sector size of the ** device that underlies the file. The sector size is the ** minimum write that can be performed without disturbing ** other bytes in the file. The xDeviceCharacteristics() ** method returns a bit vector describing behaviors of the ** underlying device: ** **
    **
  • [SQLITE_IOCAP_ATOMIC] **
  • [SQLITE_IOCAP_ATOMIC512] **
  • [SQLITE_IOCAP_ATOMIC1K] **
  • [SQLITE_IOCAP_ATOMIC2K] **
  • [SQLITE_IOCAP_ATOMIC4K] **
  • [SQLITE_IOCAP_ATOMIC8K] **
  • [SQLITE_IOCAP_ATOMIC16K] **
  • [SQLITE_IOCAP_ATOMIC32K] **
  • [SQLITE_IOCAP_ATOMIC64K] **
  • [SQLITE_IOCAP_SAFE_APPEND] **
  • [SQLITE_IOCAP_SEQUENTIAL] **
** ** The SQLITE_IOCAP_ATOMIC property means that all writes of ** any size are atomic. The SQLITE_IOCAP_ATOMICnnn values ** mean that writes of blocks that are nnn bytes in size and ** are aligned to an address which is an integer multiple of ** nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means ** that when data is appended to a file, the data is appended ** first then the size of the file is extended, never the other ** way around. The SQLITE_IOCAP_SEQUENTIAL property means that ** information is written to disk in the same order as calls ** to xWrite(). */ typedef struct sqlite3_io_methods sqlite3_io_methods; struct sqlite3_io_methods { int iVersion; int (*xClose)(sqlite3_file*); int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst); int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst); int (*xTruncate)(sqlite3_file*, sqlite3_int64 size); int (*xSync)(sqlite3_file*, int flags); int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize); int (*xLock)(sqlite3_file*, int); int (*xUnlock)(sqlite3_file*, int); int (*xCheckReservedLock)(sqlite3_file*); int (*xFileControl)(sqlite3_file*, int op, void *pArg); int (*xSectorSize)(sqlite3_file*); int (*xDeviceCharacteristics)(sqlite3_file*); /* Additional methods may be added in future releases */ }; /* ** CAPI3REF: Standard File Control Opcodes {F11310} ** ** These integer constants are opcodes for the xFileControl method ** of the [sqlite3_io_methods] object and to the [sqlite3_file_control()] ** interface. ** ** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging. This ** opcode causes the xFileControl method to write the current state of ** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED], ** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE]) ** into an integer that the pArg argument points to. This capability ** is used during testing and only needs to be supported when SQLITE_TEST ** is defined. */ #define SQLITE_FCNTL_LOCKSTATE 1 /* ** CAPI3REF: Mutex Handle {F17110} ** ** The mutex module within SQLite defines [sqlite3_mutex] to be an ** abstract type for a mutex object. The SQLite core never looks ** at the internal representation of an [sqlite3_mutex]. It only ** deals with pointers to the [sqlite3_mutex] object. ** ** Mutexes are created using [sqlite3_mutex_alloc()]. */ typedef struct sqlite3_mutex sqlite3_mutex; /* ** CAPI3REF: OS Interface Object {F11140} ** ** An instance of this object defines the interface between the ** SQLite core and the underlying operating system. The "vfs" ** in the name of the object stands for "virtual file system". ** ** The iVersion field is initially 1 but may be larger for future ** versions of SQLite. Additional fields may be appended to this ** object when the iVersion value is increased. ** ** The szOsFile field is the size of the subclassed [sqlite3_file] ** structure used by this VFS. mxPathname is the maximum length of ** a pathname in this VFS. ** ** Registered sqlite3_vfs objects are kept on a linked list formed by ** the pNext pointer. The [sqlite3_vfs_register()] ** and [sqlite3_vfs_unregister()] interfaces manage this list ** in a thread-safe way. The [sqlite3_vfs_find()] interface ** searches the list. ** ** The pNext field is the only field in the sqlite3_vfs ** structure that SQLite will ever modify. SQLite will only access ** or modify this field while holding a particular static mutex. ** The application should never modify anything within the sqlite3_vfs ** object once the object has been registered. ** ** The zName field holds the name of the VFS module. The name must ** be unique across all VFS modules. ** ** {F11141} SQLite will guarantee that the zFilename string passed to ** xOpen() is a full pathname as generated by xFullPathname() and ** that the string will be valid and unchanged until xClose() is ** called. {END} So the [sqlite3_file] can store a pointer to the ** filename if it needs to remember the filename for some reason. ** ** {F11142} The flags argument to xOpen() includes all bits set in ** the flags argument to [sqlite3_open_v2()]. Or if [sqlite3_open()] ** or [sqlite3_open16()] is used, then flags includes at least ** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. {END} ** If xOpen() opens a file read-only then it sets *pOutFlags to ** include [SQLITE_OPEN_READONLY]. Other bits in *pOutFlags may be ** set. ** ** {F11143} SQLite will also add one of the following flags to the xOpen() ** call, depending on the object being opened: ** **
    **
  • [SQLITE_OPEN_MAIN_DB] **
  • [SQLITE_OPEN_MAIN_JOURNAL] **
  • [SQLITE_OPEN_TEMP_DB] **
  • [SQLITE_OPEN_TEMP_JOURNAL] **
  • [SQLITE_OPEN_TRANSIENT_DB] **
  • [SQLITE_OPEN_SUBJOURNAL] **
  • [SQLITE_OPEN_MASTER_JOURNAL] **
{END} ** ** The file I/O implementation can use the object type flags to ** changes the way it deals with files. For example, an application ** that does not care about crash recovery or rollback might make ** the open of a journal file a no-op. Writes to this journal would ** also be no-ops, and any attempt to read the journal would return ** SQLITE_IOERR. Or the implementation might recognize that a database ** file will be doing page-aligned sector reads and writes in a random ** order and set up its I/O subsystem accordingly. ** ** SQLite might also add one of the following flags to the xOpen ** method: ** **
    **
  • [SQLITE_OPEN_DELETEONCLOSE] **
  • [SQLITE_OPEN_EXCLUSIVE] **
** ** {F11145} The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be ** deleted when it is closed. {F11146} The [SQLITE_OPEN_DELETEONCLOSE] ** will be set for TEMP databases, journals and for subjournals. ** {F11147} The [SQLITE_OPEN_EXCLUSIVE] flag means the file should be opened ** for exclusive access. This flag is set for all files except ** for the main database file. {END} ** ** {F11148} At least szOsFile bytes of memory are allocated by SQLite ** to hold the [sqlite3_file] structure passed as the third ** argument to xOpen. {END} The xOpen method does not have to ** allocate the structure; it should just fill it in. ** ** {F11149} The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS] ** to test for the existance of a file, ** or [SQLITE_ACCESS_READWRITE] to test to see ** if a file is readable and writable, or [SQLITE_ACCESS_READ] ** to test to see if a file is at least readable. {END} The file can be a ** directory. ** ** {F11150} SQLite will always allocate at least mxPathname+1 bytes for ** the output buffers for xGetTempname and xFullPathname. {F11151} The exact ** size of the output buffer is also passed as a parameter to both ** methods. {END} If the output buffer is not large enough, SQLITE_CANTOPEN ** should be returned. As this is handled as a fatal error by SQLite, ** vfs implementations should endeavor to prevent this by setting ** mxPathname to a sufficiently large value. ** ** The xRandomness(), xSleep(), and xCurrentTime() interfaces ** are not strictly a part of the filesystem, but they are ** included in the VFS structure for completeness. ** The xRandomness() function attempts to return nBytes bytes ** of good-quality randomness into zOut. The return value is ** the actual number of bytes of randomness obtained. The ** xSleep() method causes the calling thread to sleep for at ** least the number of microseconds given. The xCurrentTime() ** method returns a Julian Day Number for the current date and ** time. */ typedef struct sqlite3_vfs sqlite3_vfs; struct sqlite3_vfs { int iVersion; /* Structure version number */ int szOsFile; /* Size of subclassed sqlite3_file */ int mxPathname; /* Maximum file pathname length */ sqlite3_vfs *pNext; /* Next registered VFS */ const char *zName; /* Name of this virtual file system */ void *pAppData; /* Pointer to application-specific data */ int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*, int flags, int *pOutFlags); int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir); int (*xAccess)(sqlite3_vfs*, const char *zName, int flags); int (*xGetTempname)(sqlite3_vfs*, int nOut, char *zOut); int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut); void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename); void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg); void *(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol); void (*xDlClose)(sqlite3_vfs*, void*); int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut); int (*xSleep)(sqlite3_vfs*, int microseconds); int (*xCurrentTime)(sqlite3_vfs*, double*); /* New fields may be appended in figure versions. The iVersion ** value will increment whenever this happens. */ }; /* ** CAPI3REF: Flags for the xAccess VFS method {F11190} ** ** {F11191} These integer constants can be used as the third parameter to ** the xAccess method of an [sqlite3_vfs] object. {END} They determine ** what kind of permissions the xAccess method is ** looking for. {F11192} With SQLITE_ACCESS_EXISTS, the xAccess method ** simply checks to see if the file exists. {F11193} With ** SQLITE_ACCESS_READWRITE, the xAccess method checks to see ** if the file is both readable and writable. {F11194} With ** SQLITE_ACCESS_READ the xAccess method ** checks to see if the file is readable. */ #define SQLITE_ACCESS_EXISTS 0 #define SQLITE_ACCESS_READWRITE 1 #define SQLITE_ACCESS_READ 2 /* ** CAPI3REF: Enable Or Disable Extended Result Codes {F12200} ** ** The sqlite3_extended_result_codes() routine enables or disables the ** [SQLITE_IOERR_READ | extended result codes] feature of SQLite. ** The extended result codes are disabled by default for historical ** compatibility. ** ** INVARIANTS: ** ** {F12201} Each new [database connection] has the ** [extended result codes] feature ** disabled by default. ** ** {F12202} The [sqlite3_extended_result_codes(D,F)] interface will enable ** [extended result codes] for the ** [database connection] D if the F parameter ** is true, or disable them if F is false. */ SQLITE_API int sqlite3_extended_result_codes(sqlite3*, int onoff); /* ** CAPI3REF: Last Insert Rowid {F12220} ** ** Each entry in an SQLite table has a unique 64-bit signed ** integer key called the "rowid". The rowid is always available ** as an undeclared column named ROWID, OID, or _ROWID_ as long as those ** names are not also used by explicitly declared columns. If ** the table has a column of type INTEGER PRIMARY KEY then that column ** is another alias for the rowid. ** ** This routine returns the rowid of the most recent ** successful INSERT into the database from the database connection ** shown in the first argument. If no successful inserts ** have ever occurred on this database connection, zero is returned. ** ** If an INSERT occurs within a trigger, then the rowid of the ** inserted row is returned by this routine as long as the trigger ** is running. But once the trigger terminates, the value returned ** by this routine reverts to the last value inserted before the ** trigger fired. ** ** An INSERT that fails due to a constraint violation is not a ** successful insert and does not change the value returned by this ** routine. Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK, ** and INSERT OR ABORT make no changes to the return value of this ** routine when their insertion fails. When INSERT OR REPLACE ** encounters a constraint violation, it does not fail. The ** INSERT continues to completion after deleting rows that caused ** the constraint problem so INSERT OR REPLACE will always change ** the return value of this interface. ** ** For the purposes of this routine, an insert is considered to ** be successful even if it is subsequently rolled back. ** ** INVARIANTS: ** ** {F12221} The [sqlite3_last_insert_rowid()] function returns the ** rowid of the most recent successful insert done ** on the same database connection and within the same ** trigger context, or zero if there have ** been no qualifying inserts on that connection. ** ** {F12223} The [sqlite3_last_insert_rowid()] function returns ** same value when called from the same trigger context ** immediately before and after a ROLLBACK. ** ** LIMITATIONS: ** ** {U12232} If a separate thread does a new insert on the same ** database connection while the [sqlite3_last_insert_rowid()] ** function is running and thus changes the last insert rowid, ** then the value returned by [sqlite3_last_insert_rowid()] is ** unpredictable and might not equal either the old or the new ** last insert rowid. */ SQLITE_API sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*); /* ** CAPI3REF: Count The Number Of Rows Modified {F12240} ** ** This function returns the number of database rows that were changed ** or inserted or deleted by the most recently completed SQL statement ** on the connection specified by the first parameter. Only ** changes that are directly specified by the INSERT, UPDATE, or ** DELETE statement are counted. Auxiliary changes caused by ** triggers are not counted. Use the [sqlite3_total_changes()] function ** to find the total number of changes including changes caused by triggers. ** ** A "row change" is a change to a single row of a single table ** caused by an INSERT, DELETE, or UPDATE statement. Rows that ** are changed as side effects of REPLACE constraint resolution, ** rollback, ABORT processing, DROP TABLE, or by any other ** mechanisms do not count as direct row changes. ** ** A "trigger context" is a scope of execution that begins and ** ends with the script of a trigger. Most SQL statements are ** evaluated outside of any trigger. This is the "top level" ** trigger context. If a trigger fires from the top level, a ** new trigger context is entered for the duration of that one ** trigger. Subtriggers create subcontexts for their duration. ** ** Calling [sqlite3_exec()] or [sqlite3_step()] recursively does ** not create a new trigger context. ** ** This function returns the number of direct row changes in the ** most recent INSERT, UPDATE, or DELETE statement within the same ** trigger context. ** ** So when called from the top level, this function returns the ** number of changes in the most recent INSERT, UPDATE, or DELETE ** that also occurred at the top level. ** Within the body of a trigger, the sqlite3_changes() interface ** can be called to find the number of ** changes in the most recently completed INSERT, UPDATE, or DELETE ** statement within the body of the same trigger. ** However, the number returned does not include in changes ** caused by subtriggers since they have their own context. ** ** SQLite implements the command "DELETE FROM table" without ** a WHERE clause by dropping and recreating the table. (This is much ** faster than going through and deleting individual elements from the ** table.) Because of this optimization, the deletions in ** "DELETE FROM table" are not row changes and will not be counted ** by the sqlite3_changes() or [sqlite3_total_changes()] functions. ** To get an accurate count of the number of rows deleted, use ** "DELETE FROM table WHERE 1" instead. ** ** INVARIANTS: ** ** {F12241} The [sqlite3_changes()] function returns the number of ** row changes caused by the most recent INSERT, UPDATE, ** or DELETE statement on the same database connection and ** within the same trigger context, or zero if there have ** not been any qualifying row changes. ** ** LIMITATIONS: ** ** {U12252} If a separate thread makes changes on the same database connection ** while [sqlite3_changes()] is running then the value returned ** is unpredictable and unmeaningful. */ SQLITE_API int sqlite3_changes(sqlite3*); /* ** CAPI3REF: Total Number Of Rows Modified {F12260} *** ** This function returns the number of row changes caused ** by INSERT, UPDATE or DELETE statements since the database handle ** was opened. The count includes all changes from all trigger ** contexts. But the count does not include changes used to ** implement REPLACE constraints, do rollbacks or ABORT processing, ** or DROP table processing. ** The changes ** are counted as soon as the statement that makes them is completed ** (when the statement handle is passed to [sqlite3_reset()] or ** [sqlite3_finalize()]). ** ** SQLite implements the command "DELETE FROM table" without ** a WHERE clause by dropping and recreating the table. (This is much ** faster than going ** through and deleting individual elements from the table.) Because of ** this optimization, the change count for "DELETE FROM table" will be ** zero regardless of the number of elements that were originally in the ** table. To get an accurate count of the number of rows deleted, use ** "DELETE FROM table WHERE 1" instead. ** ** See also the [sqlite3_changes()] interface. ** ** INVARIANTS: ** ** {F12261} The [sqlite3_total_changes()] returns the total number ** of row changes caused by INSERT, UPDATE, and/or DELETE ** statements on the same [database connection], in any ** trigger context, since the database connection was ** created. ** ** LIMITATIONS: ** ** {U12264} If a separate thread makes changes on the same database connection ** while [sqlite3_total_changes()] is running then the value ** returned is unpredictable and unmeaningful. */ SQLITE_API int sqlite3_total_changes(sqlite3*); /* ** CAPI3REF: Interrupt A Long-Running Query {F12270} ** ** This function causes any pending database operation to abort and ** return at its earliest opportunity. This routine is typically ** called in response to a user action such as pressing "Cancel" ** or Ctrl-C where the user wants a long query operation to halt ** immediately. ** ** It is safe to call this routine from a thread different from the ** thread that is currently running the database operation. But it ** is not safe to call this routine with a database connection that ** is closed or might close before sqlite3_interrupt() returns. ** ** If an SQL is very nearly finished at the time when sqlite3_interrupt() ** is called, then it might not have an opportunity to be interrupted. ** It might continue to completion. ** An SQL operation that is interrupted will return ** [SQLITE_INTERRUPT]. If the interrupted SQL operation is an ** INSERT, UPDATE, or DELETE that is inside an explicit transaction, ** then the entire transaction will be rolled back automatically. ** A call to sqlite3_interrupt() has no effect on SQL statements ** that are started after sqlite3_interrupt() returns. ** ** INVARIANTS: ** ** {F12271} The [sqlite3_interrupt()] interface will force all running ** SQL statements associated with the same database connection ** to halt after processing at most one additional row of ** data. ** ** {F12272} Any SQL statement that is interrupted by [sqlite3_interrupt()] ** will return [SQLITE_INTERRUPT]. ** ** LIMITATIONS: ** ** {U12279} If the database connection closes while [sqlite3_interrupt()] ** is running then bad things will likely happen. */ SQLITE_API void sqlite3_interrupt(sqlite3*); /* ** CAPI3REF: Determine If An SQL Statement Is Complete {F10510} ** ** These routines are useful for command-line input to determine if the ** currently entered text seems to form complete a SQL statement or ** if additional input is needed before sending the text into ** SQLite for parsing. These routines return true if the input string ** appears to be a complete SQL statement. A statement is judged to be ** complete if it ends with a semicolon token and is not a fragment of a ** CREATE TRIGGER statement. Semicolons that are embedded within ** string literals or quoted identifier names or comments are not ** independent tokens (they are part of the token in which they are ** embedded) and thus do not count as a statement terminator. ** ** These routines do not parse the SQL and ** so will not detect syntactically incorrect SQL. ** ** INVARIANTS: ** ** {F10511} The sqlite3_complete() and sqlite3_complete16() functions ** return true (non-zero) if and only if the last ** non-whitespace token in their input is a semicolon that ** is not in between the BEGIN and END of a CREATE TRIGGER ** statement. ** ** LIMITATIONS: ** ** {U10512} The input to sqlite3_complete() must be a zero-terminated ** UTF-8 string. ** ** {U10513} The input to sqlite3_complete16() must be a zero-terminated ** UTF-16 string in native byte order. */ SQLITE_API int sqlite3_complete(const char *sql); SQLITE_API int sqlite3_complete16(const void *sql); /* ** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors {F12310} ** ** This routine identifies a callback function that might be ** invoked whenever an attempt is made to open a database table ** that another thread or process has locked. ** If the busy callback is NULL, then [SQLITE_BUSY] ** or [SQLITE_IOERR_BLOCKED] ** is returned immediately upon encountering the lock. ** If the busy callback is not NULL, then the ** callback will be invoked with two arguments. The ** first argument to the handler is a copy of the void* pointer which ** is the third argument to this routine. The second argument to ** the handler is the number of times that the busy handler has ** been invoked for this locking event. If the ** busy callback returns 0, then no additional attempts are made to ** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned. ** If the callback returns non-zero, then another attempt ** is made to open the database for reading and the cycle repeats. ** ** The presence of a busy handler does not guarantee that ** it will be invoked when there is lock contention. ** If SQLite determines that invoking the busy handler could result in ** a deadlock, it will go ahead and return [SQLITE_BUSY] or ** [SQLITE_IOERR_BLOCKED] instead of invoking the ** busy handler. ** Consider a scenario where one process is holding a read lock that ** it is trying to promote to a reserved lock and ** a second process is holding a reserved lock that it is trying ** to promote to an exclusive lock. The first process cannot proceed ** because it is blocked by the second and the second process cannot ** proceed because it is blocked by the first. If both processes ** invoke the busy handlers, neither will make any progress. Therefore, ** SQLite returns [SQLITE_BUSY] for the first process, hoping that this ** will induce the first process to release its read lock and allow ** the second process to proceed. ** ** The default busy callback is NULL. ** ** The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED] ** when SQLite is in the middle of a large transaction where all the ** changes will not fit into the in-memory cache. SQLite will ** already hold a RESERVED lock on the database file, but it needs ** to promote this lock to EXCLUSIVE so that it can spill cache ** pages into the database file without harm to concurrent ** readers. If it is unable to promote the lock, then the in-memory ** cache will be left in an inconsistent state and so the error ** code is promoted from the relatively benign [SQLITE_BUSY] to ** the more severe [SQLITE_IOERR_BLOCKED]. This error code promotion ** forces an automatic rollback of the changes. See the ** ** CorruptionFollowingBusyError wiki page for a discussion of why ** this is important. ** ** There can only be a single busy handler defined for each database ** connection. Setting a new busy handler clears any previous one. ** Note that calling [sqlite3_busy_timeout()] will also set or clear ** the busy handler. ** ** INVARIANTS: ** ** {F12311} The [sqlite3_busy_handler()] function replaces the busy handler ** callback in the database connection identified by the 1st ** parameter with a new busy handler identified by the 2nd and 3rd ** parameters. ** ** {F12312} The default busy handler for new database connections is NULL. ** ** {F12314} When two or more database connection share a common cache, ** the busy handler for the database connection currently using ** the cache is invoked when the cache encounters a lock. ** ** {F12316} If a busy handler callback returns zero, then the SQLite ** interface that provoked the locking event will return ** [SQLITE_BUSY]. ** ** {F12318} SQLite will invokes the busy handler with two argument which ** are a copy of the pointer supplied by the 3rd parameter to ** [sqlite3_busy_handler()] and a count of the number of prior ** invocations of the busy handler for the same locking event. ** ** LIMITATIONS: ** ** {U12319} A busy handler should not call close the database connection ** or prepared statement that invoked the busy handler. */ SQLITE_API int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*); /* ** CAPI3REF: Set A Busy Timeout {F12340} ** ** This routine sets a [sqlite3_busy_handler | busy handler] ** that sleeps for a while when a ** table is locked. The handler will sleep multiple times until ** at least "ms" milliseconds of sleeping have been done. {F12343} After ** "ms" milliseconds of sleeping, the handler returns 0 which ** causes [sqlite3_step()] to return [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED]. ** ** Calling this routine with an argument less than or equal to zero ** turns off all busy handlers. ** ** There can only be a single busy handler for a particular database ** connection. If another busy handler was defined ** (using [sqlite3_busy_handler()]) prior to calling ** this routine, that other busy handler is cleared. ** ** INVARIANTS: ** ** {F12341} The [sqlite3_busy_timeout()] function overrides any prior ** [sqlite3_busy_timeout()] or [sqlite3_busy_handler()] setting ** on the same database connection. ** ** {F12343} If the 2nd parameter to [sqlite3_busy_timeout()] is less than ** or equal to zero, then the busy handler is cleared so that ** all subsequent locking events immediately return [SQLITE_BUSY]. ** ** {F12344} If the 2nd parameter to [sqlite3_busy_timeout()] is a positive ** number N, then a busy handler is set that repeatedly calls ** the xSleep() method in the VFS interface until either the ** lock clears or until the cumulative sleep time reported back ** by xSleep() exceeds N milliseconds. */ SQLITE_API int sqlite3_busy_timeout(sqlite3*, int ms); /* ** CAPI3REF: Convenience Routines For Running Queries {F12370} ** ** Definition: A result table is memory data structure created by the ** [sqlite3_get_table()] interface. A result table records the ** complete query results from one or more queries. ** ** The table conceptually has a number of rows and columns. But ** these numbers are not part of the result table itself. These ** numbers are obtained separately. Let N be the number of rows ** and M be the number of columns. ** ** A result table is an array of pointers to zero-terminated ** UTF-8 strings. There are (N+1)*M elements in the array. ** The first M pointers point to zero-terminated strings that ** contain the names of the columns. ** The remaining entries all point to query results. NULL ** values are give a NULL pointer. All other values are in ** their UTF-8 zero-terminated string representation as returned by ** [sqlite3_column_text()]. ** ** A result table might consists of one or more memory allocations. ** It is not safe to pass a result table directly to [sqlite3_free()]. ** A result table should be deallocated using [sqlite3_free_table()]. ** ** As an example of the result table format, suppose a query result ** is as follows: ** ** 
**        Name        | Age
**        -----------------------
**        Alice       | 43
**        Bob         | 28
**        Cindy       | 21
**
** ** There are two column (M==2) and three rows (N==3). Thus the ** result table has 8 entries. Suppose the result table is stored ** in an array names azResult. Then azResult holds this content: ** ** 
**        azResult[0] = "Name";
**        azResult[1] = "Age";
**        azResult[2] = "Alice";
**        azResult[3] = "43";
**        azResult[4] = "Bob";
**        azResult[5] = "28";
**        azResult[6] = "Cindy";
**        azResult[7] = "21";
**
** ** The sqlite3_get_table() function evaluates one or more ** semicolon-separated SQL statements in the zero-terminated UTF-8 ** string of its 2nd parameter. It returns a result table to the ** pointer given in its 3rd parameter. ** ** After the calling function has finished using the result, it should ** pass the pointer to the result table to sqlite3_free_table() in order to ** release the memory that was malloc-ed. Because of the way the ** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling ** function must not try to call [sqlite3_free()] directly. Only ** [sqlite3_free_table()] is able to release the memory properly and safely. ** ** The sqlite3_get_table() interface is implemented as a wrapper around ** [sqlite3_exec()]. The sqlite3_get_table() routine does not have access ** to any internal data structures of SQLite. It uses only the public ** interface defined here. As a consequence, errors that occur in the ** wrapper layer outside of the internal [sqlite3_exec()] call are not ** reflected in subsequent calls to [sqlite3_errcode()] or ** [sqlite3_errmsg()]. ** ** INVARIANTS: ** ** {F12371} If a [sqlite3_get_table()] fails a memory allocation, then ** it frees the result table under construction, aborts the ** query in process, skips any subsequent queries, sets the ** *resultp output pointer to NULL and returns [SQLITE_NOMEM]. ** ** {F12373} If the ncolumn parameter to [sqlite3_get_table()] is not NULL ** then [sqlite3_get_table()] write the number of columns in the ** result set of the query into *ncolumn if the query is ** successful (if the function returns SQLITE_OK). ** ** {F12374} If the nrow parameter to [sqlite3_get_table()] is not NULL ** then [sqlite3_get_table()] write the number of rows in the ** result set of the query into *nrow if the query is ** successful (if the function returns SQLITE_OK). ** ** {F12376} The [sqlite3_get_table()] function sets its *ncolumn value ** to the number of columns in the result set of the query in the ** sql parameter, or to zero if the query in sql has an empty ** result set. */ SQLITE_API int sqlite3_get_table( sqlite3*, /* An open database */ const char *sql, /* SQL to be evaluated */ char ***pResult, /* Results of the query */ int *nrow, /* Number of result rows written here */ int *ncolumn, /* Number of result columns written here */ char **errmsg /* Error msg written here */ ); SQLITE_API void sqlite3_free_table(char **result); /* ** CAPI3REF: Formatted String Printing Functions {F17400} ** ** These routines are workalikes of the "printf()" family of functions ** from the standard C library. ** ** The sqlite3_mprintf() and sqlite3_vmprintf() routines write their ** results into memory obtained from [sqlite3_malloc()]. ** The strings returned by these two routines should be ** released by [sqlite3_free()]. Both routines return a ** NULL pointer if [sqlite3_malloc()] is unable to allocate enough ** memory to hold the resulting string. ** ** In sqlite3_snprintf() routine is similar to "snprintf()" from ** the standard C library. The result is written into the ** buffer supplied as the second parameter whose size is given by ** the first parameter. Note that the order of the ** first two parameters is reversed from snprintf(). This is an ** historical accident that cannot be fixed without breaking ** backwards compatibility. Note also that sqlite3_snprintf() ** returns a pointer to its buffer instead of the number of ** characters actually written into the buffer. We admit that ** the number of characters written would be a more useful return ** value but we cannot change the implementation of sqlite3_snprintf() ** now without breaking compatibility. ** ** As long as the buffer size is greater than zero, sqlite3_snprintf() ** guarantees that the buffer is always zero-terminated. The first ** parameter "n" is the total size of the buffer, including space for ** the zero terminator. So the longest string that can be completely ** written will be n-1 characters. ** ** These routines all implement some additional formatting ** options that are useful for constructing SQL statements. ** All of the usual printf formatting options apply. In addition, there ** is are "%q", "%Q", and "%z" options. ** ** The %q option works like %s in that it substitutes a null-terminated ** string from the argument list. But %q also doubles every '\'' character. ** %q is designed for use inside a string literal. By doubling each '\'' ** character it escapes that character and allows it to be inserted into ** the string. ** ** For example, so some string variable contains text as follows: ** ** 
**  char *zText = "It's a happy day!";
**
** ** One can use this text in an SQL statement as follows: ** ** 
**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES('%q')", zText);
**  sqlite3_exec(db, zSQL, 0, 0, 0);
**  sqlite3_free(zSQL);
**
** ** Because the %q format string is used, the '\'' character in zText ** is escaped and the SQL generated is as follows: ** ** 
**  INSERT INTO table1 VALUES('It''s a happy day!')
**
** ** This is correct. Had we used %s instead of %q, the generated SQL ** would have looked like this: ** ** 
**  INSERT INTO table1 VALUES('It's a happy day!');
**
** ** This second example is an SQL syntax error. As a general rule you ** should always use %q instead of %s when inserting text into a string ** literal. ** ** The %Q option works like %q except it also adds single quotes around ** the outside of the total string. Or if the parameter in the argument ** list is a NULL pointer, %Q substitutes the text "NULL" (without single ** quotes) in place of the %Q option. {END} So, for example, one could say: ** ** 
**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
**  sqlite3_exec(db, zSQL, 0, 0, 0);
**  sqlite3_free(zSQL);
**
** ** The code above will render a correct SQL statement in the zSQL ** variable even if the zText variable is a NULL pointer. ** ** The "%z" formatting option works exactly like "%s" with the ** addition that after the string has been read and copied into ** the result, [sqlite3_free()] is called on the input string. {END} ** ** INVARIANTS: ** ** {F17403} The [sqlite3_mprintf()] and [sqlite3_vmprintf()] interfaces ** return either pointers to zero-terminated UTF-8 strings held in ** memory obtained from [sqlite3_malloc()] or NULL pointers if ** a call to [sqlite3_malloc()] fails. ** ** {F17406} The [sqlite3_snprintf()] interface writes a zero-terminated ** UTF-8 string into the buffer pointed to by the second parameter ** provided that the first parameter is greater than zero. ** ** {F17407} The [sqlite3_snprintf()] interface does not writes slots of ** its output buffer (the second parameter) outside the range ** of 0 through N-1 (where N is the first parameter) ** regardless of the length of the string ** requested by the format specification. ** */ SQLITE_API char *sqlite3_mprintf(const char*,...); SQLITE_API char *sqlite3_vmprintf(const char*, va_list); SQLITE_API char *sqlite3_snprintf(int,char*,const char*, ...); /* ** CAPI3REF: Memory Allocation Subsystem {F17300} ** ** The SQLite core uses these three routines for all of its own ** internal memory allocation needs. "Core" in the previous sentence ** does not include operating-system specific VFS implementation. The ** windows VFS uses native malloc and free for some operations. ** ** The sqlite3_malloc() routine returns a pointer to a block ** of memory at least N bytes in length, where N is the parameter. ** If sqlite3_malloc() is unable to obtain sufficient free ** memory, it returns a NULL pointer. If the parameter N to ** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns ** a NULL pointer. ** ** Calling sqlite3_free() with a pointer previously returned ** by sqlite3_malloc() or sqlite3_realloc() releases that memory so ** that it might be reused. The sqlite3_free() routine is ** a no-op if is called with a NULL pointer. Passing a NULL pointer ** to sqlite3_free() is harmless. After being freed, memory ** should neither be read nor written. Even reading previously freed ** memory might result in a segmentation fault or other severe error. ** Memory corruption, a segmentation fault, or other severe error ** might result if sqlite3_free() is called with a non-NULL pointer that ** was not obtained from sqlite3_malloc() or sqlite3_free(). ** ** The sqlite3_realloc() interface attempts to resize a ** prior memory allocation to be at least N bytes, where N is the ** second parameter. The memory allocation to be resized is the first ** parameter. If the first parameter to sqlite3_realloc() ** is a NULL pointer then its behavior is identical to calling ** sqlite3_malloc(N) where N is the second parameter to sqlite3_realloc(). ** If the second parameter to sqlite3_realloc() is zero or ** negative then the behavior is exactly the same as calling ** sqlite3_free(P) where P is the first parameter to sqlite3_realloc(). ** Sqlite3_realloc() returns a pointer to a memory allocation ** of at least N bytes in size or NULL if sufficient memory is unavailable. ** If M is the size of the prior allocation, then min(N,M) bytes ** of the prior allocation are copied into the beginning of buffer returned ** by sqlite3_realloc() and the prior allocation is freed. ** If sqlite3_realloc() returns NULL, then the prior allocation ** is not freed. ** ** The memory returned by sqlite3_malloc() and sqlite3_realloc() ** is always aligned to at least an 8 byte boundary. {END} ** ** The default implementation ** of the memory allocation subsystem uses the malloc(), realloc() ** and free() provided by the standard C library. {F17382} However, if ** SQLite is compiled with the following C preprocessor macro ** **
SQLITE_MEMORY_SIZE=NNN
** ** where NNN is an integer, then SQLite create a static ** array of at least NNN bytes in size and use that array ** for all of its dynamic memory allocation needs. {END} Additional ** memory allocator options may be added in future releases. ** ** In SQLite version 3.5.0 and 3.5.1, it was possible to define ** the SQLITE_OMIT_MEMORY_ALLOCATION which would cause the built-in ** implementation of these routines to be omitted. That capability ** is no longer provided. Only built-in memory allocators can be ** used. ** ** The windows OS interface layer calls ** the system malloc() and free() directly when converting ** filenames between the UTF-8 encoding used by SQLite ** and whatever filename encoding is used by the particular windows ** installation. Memory allocation errors are detected, but ** they are reported back as [SQLITE_CANTOPEN] or ** [SQLITE_IOERR] rather than [SQLITE_NOMEM]. ** ** INVARIANTS: ** ** {F17303} The [sqlite3_malloc(N)] interface returns either a pointer to ** newly checked-out block of at least N bytes of memory ** that is 8-byte aligned, ** or it returns NULL if it is unable to fulfill the request. ** ** {F17304} The [sqlite3_malloc(N)] interface returns a NULL pointer if ** N is less than or equal to zero. ** ** {F17305} The [sqlite3_free(P)] interface releases memory previously ** returned from [sqlite3_malloc()] or [sqlite3_realloc()], ** making it available for reuse. ** ** {F17306} A call to [sqlite3_free(NULL)] is a harmless no-op. ** ** {F17310} A call to [sqlite3_realloc(0,N)] is equivalent to a call ** to [sqlite3_malloc(N)]. ** ** {F17312} A call to [sqlite3_realloc(P,0)] is equivalent to a call ** to [sqlite3_free(P)]. ** ** {F17315} The SQLite core uses [sqlite3_malloc()], [sqlite3_realloc()], ** and [sqlite3_free()] for all of its memory allocation and ** deallocation needs. ** ** {F17318} The [sqlite3_realloc(P,N)] interface returns either a pointer ** to a block of checked-out memory of at least N bytes in size ** that is 8-byte aligned, or a NULL pointer. ** ** {F17321} When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first ** copies the first K bytes of content from P into the newly allocated ** where K is the lessor of N and the size of the buffer P. ** ** {F17322} When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first ** releases the buffer P. ** ** {F17323} When [sqlite3_realloc(P,N)] returns NULL, the buffer P is ** not modified or released. ** ** LIMITATIONS: ** ** {U17350} The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()] ** must be either NULL or else a pointer obtained from a prior ** invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that has ** not been released. ** ** {U17351} The application must not read or write any part of ** a block of memory after it has been released using ** [sqlite3_free()] or [sqlite3_realloc()]. ** */ SQLITE_API void *sqlite3_malloc(int); SQLITE_API void *sqlite3_realloc(void*, int); SQLITE_API void sqlite3_free(void*); /* ** CAPI3REF: Memory Allocator Statistics {F17370} ** ** SQLite provides these two interfaces for reporting on the status ** of the [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()] ** the memory allocation subsystem included within the SQLite. ** ** INVARIANTS: ** ** {F17371} The [sqlite3_memory_used()] routine returns the ** number of bytes of memory currently outstanding ** (malloced but not freed). ** ** {F17373} The [sqlite3_memory_highwater()] routine returns the maximum ** value of [sqlite3_memory_used()] ** since the highwater mark was last reset. ** ** {F17374} The values returned by [sqlite3_memory_used()] and ** [sqlite3_memory_highwater()] include any overhead ** added by SQLite in its implementation of [sqlite3_malloc()], ** but not overhead added by the any underlying system library ** routines that [sqlite3_malloc()] may call. ** ** {F17375} The memory highwater mark is reset to the current value of ** [sqlite3_memory_used()] if and only if the parameter to ** [sqlite3_memory_highwater()] is true. The value returned ** by [sqlite3_memory_highwater(1)] is the highwater mark ** prior to the reset. */ SQLITE_API sqlite3_int64 sqlite3_memory_used(void); SQLITE_API sqlite3_int64 sqlite3_memory_highwater(int resetFlag); /* ** CAPI3REF: Pseudo-Random Number Generator {F17390} ** ** SQLite contains a high-quality pseudo-random number generator (PRNG) used to ** select random ROWIDs when inserting new records into a table that ** already uses the largest possible ROWID. The PRNG is also used for ** the build-in random() and randomblob() SQL functions. This interface allows ** appliations to access the same PRNG for other purposes. ** ** A call to this routine stores N bytes of randomness into buffer P. ** ** The first time this routine is invoked (either internally or by ** the application) the PRNG is seeded using randomness obtained ** from the xRandomness method of the default [sqlite3_vfs] object. ** On all subsequent invocations, the pseudo-randomness is generated ** internally and without recourse to the [sqlite3_vfs] xRandomness ** method. ** ** INVARIANTS: ** ** {F17392} The [sqlite3_randomness(N,P)] interface writes N bytes of ** high-quality pseudo-randomness into buffer P. */ SQLITE_API void sqlite3_randomness(int N, void *P); /* ** CAPI3REF: Compile-Time Authorization Callbacks {F12500} ** ** This routine registers a authorizer callback with a particular ** [database connection], supplied in the first argument. ** The authorizer callback is invoked as SQL statements are being compiled ** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()], ** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()]. At various ** points during the compilation process, as logic is being created ** to perform various actions, the authorizer callback is invoked to ** see if those actions are allowed. The authorizer callback should ** return [SQLITE_OK] to allow the action, [SQLITE_IGNORE] to disallow the ** specific action but allow the SQL statement to continue to be ** compiled, or [SQLITE_DENY] to cause the entire SQL statement to be ** rejected with an error. If the authorizer callback returns ** any value other than [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY] ** then [sqlite3_prepare_v2()] or equivalent call that triggered ** the authorizer will fail with an error message. ** ** When the callback returns [SQLITE_OK], that means the operation ** requested is ok. When the callback returns [SQLITE_DENY], the ** [sqlite3_prepare_v2()] or equivalent call that triggered the ** authorizer will fail with an error message explaining that ** access is denied. If the authorizer code is [SQLITE_READ] ** and the callback returns [SQLITE_IGNORE] then the ** [prepared statement] statement is constructed to substitute ** a NULL value in place of the table column that would have ** been read if [SQLITE_OK] had been returned. The [SQLITE_IGNORE] ** return can be used to deny an untrusted user access to individual ** columns of a table. ** ** The first parameter to the authorizer callback is a copy of ** the third parameter to the sqlite3_set_authorizer() interface. ** The second parameter to the callback is an integer ** [SQLITE_COPY | action code] that specifies the particular action ** to be authorized. The third through sixth ** parameters to the callback are zero-terminated strings that contain ** additional details about the action to be authorized. ** ** An authorizer is used when [sqlite3_prepare | preparing] ** SQL statements from an untrusted ** source, to ensure that the SQL statements do not try to access data ** that they are not allowed to see, or that they do not try to ** execute malicious statements that damage the database. For ** example, an application may allow a user to enter arbitrary ** SQL queries for evaluation by a database. But the application does ** not want the user to be able to make arbitrary changes to the ** database. An authorizer could then be put in place while the ** user-entered SQL is being [sqlite3_prepare | prepared] that ** disallows everything except [SELECT] statements. ** ** Applications that need to process SQL from untrusted sources ** might also consider lowering resource limits using [sqlite3_limit()] ** and limiting database size using the [max_page_count] [PRAGMA] ** in addition to using an authorizer. ** ** Only a single authorizer can be in place on a database connection ** at a time. Each call to sqlite3_set_authorizer overrides the ** previous call. Disable the authorizer by installing a NULL callback. ** The authorizer is disabled by default. ** ** Note that the authorizer callback is invoked only during ** [sqlite3_prepare()] or its variants. Authorization is not ** performed during statement evaluation in [sqlite3_step()]. ** ** INVARIANTS: ** ** {F12501} The [sqlite3_set_authorizer(D,...)] interface registers a ** authorizer callback with database connection D. ** ** {F12502} The authorizer callback is invoked as SQL statements are ** being compiled ** ** {F12503} If the authorizer callback returns any value other than ** [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY] then ** the [sqlite3_prepare_v2()] or equivalent call that caused ** the authorizer callback to run shall fail with an ** [SQLITE_ERROR] error code and an appropriate error message. ** ** {F12504} When the authorizer callback returns [SQLITE_OK], the operation ** described is coded normally. ** ** {F12505} When the authorizer callback returns [SQLITE_DENY], the ** [sqlite3_prepare_v2()] or equivalent call that caused the ** authorizer callback to run shall fail ** with an [SQLITE_ERROR] error code and an error message ** explaining that access is denied. ** ** {F12506} If the authorizer code (the 2nd parameter to the authorizer ** callback) is [SQLITE_READ] and the authorizer callback returns ** [SQLITE_IGNORE] then the prepared statement is constructed to ** insert a NULL value in place of the table column that would have ** been read if [SQLITE_OK] had been returned. ** ** {F12507} If the authorizer code (the 2nd parameter to the authorizer ** callback) is anything other than [SQLITE_READ], then ** a return of [SQLITE_IGNORE] has the same effect as [SQLITE_DENY]. ** ** {F12510} The first parameter to the authorizer callback is a copy of ** the third parameter to the [sqlite3_set_authorizer()] interface. ** ** {F12511} The second parameter to the callback is an integer ** [SQLITE_COPY | action code] that specifies the particular action ** to be authorized. ** ** {F12512} The third through sixth parameters to the callback are ** zero-terminated strings that contain ** additional details about the action to be authorized. ** ** {F12520} Each call to [sqlite3_set_authorizer()] overrides the ** any previously installed authorizer. ** ** {F12521} A NULL authorizer means that no authorization ** callback is invoked. ** ** {F12522} The default authorizer is NULL. */ SQLITE_API int sqlite3_set_authorizer( sqlite3*, int (*xAuth)(void*,int,const char*,const char*,const char*,const char*), void *pUserData ); /* ** CAPI3REF: Authorizer Return Codes {F12590} ** ** The [sqlite3_set_authorizer | authorizer callback function] must ** return either [SQLITE_OK] or one of these two constants in order ** to signal SQLite whether or not the action is permitted. See the ** [sqlite3_set_authorizer | authorizer documentation] for additional ** information. */ #define SQLITE_DENY 1 /* Abort the SQL statement with an error */ #define SQLITE_IGNORE 2 /* Don't allow access, but don't generate an error */ /* ** CAPI3REF: Authorizer Action Codes {F12550} ** ** The [sqlite3_set_authorizer()] interface registers a callback function ** that is invoked to authorizer certain SQL statement actions. The ** second parameter to the callback is an integer code that specifies ** what action is being authorized. These are the integer action codes that ** the authorizer callback may be passed. ** ** These action code values signify what kind of operation is to be ** authorized. The 3rd and 4th parameters to the authorization ** callback function will be parameters or NULL depending on which of these ** codes is used as the second parameter. The 5th parameter to the ** authorizer callback is the name of the database ("main", "temp", ** etc.) if applicable. The 6th parameter to the authorizer callback ** is the name of the inner-most trigger or view that is responsible for ** the access attempt or NULL if this access attempt is directly from ** top-level SQL code. ** ** INVARIANTS: ** ** {F12551} The second parameter to an ** [sqlite3_set_authorizer | authorizer callback is always an integer ** [SQLITE_COPY | authorizer code] that specifies what action ** is being authorized. ** ** {F12552} The 3rd and 4th parameters to the ** [sqlite3_set_authorizer | authorization callback function] ** will be parameters or NULL depending on which ** [SQLITE_COPY | authorizer code] is used as the second parameter. ** ** {F12553} The 5th parameter to the ** [sqlite3_set_authorizer | authorizer callback] is the name ** of the database (example: "main", "temp", etc.) if applicable. ** ** {F12554} The 6th parameter to the ** [sqlite3_set_authorizer | authorizer callback] is the name ** of the inner-most trigger or view that is responsible for ** the access attempt or NULL if this access attempt is directly from ** top-level SQL code. */ /******************************************* 3rd ************ 4th ***********/ #define SQLITE_CREATE_INDEX 1 /* Index Name Table Name */ #define SQLITE_CREATE_TABLE 2 /* Table Name NULL */ #define SQLITE_CREATE_TEMP_INDEX 3 /* Index Name Table Name */ #define SQLITE_CREATE_TEMP_TABLE 4 /* Table Name NULL */ #define SQLITE_CREATE_TEMP_TRIGGER 5 /* Trigger Name Table Name */ #define SQLITE_CREATE_TEMP_VIEW 6 /* View Name NULL */ #define SQLITE_CREATE_TRIGGER 7 /* Trigger Name Table Name */ #define SQLITE_CREATE_VIEW 8 /* View Name NULL */ #define SQLITE_DELETE 9 /* Table Name NULL */ #define SQLITE_DROP_INDEX 10 /* Index Name Table Name */ #define SQLITE_DROP_TABLE 11 /* Table Name NULL */ #define SQLITE_DROP_TEMP_INDEX 12 /* Index Name Table Name */ #define SQLITE_DROP_TEMP_TABLE 13 /* Table Name NULL */ #define SQLITE_DROP_TEMP_TRIGGER 14 /* Trigger Name Table Name */ #define SQLITE_DROP_TEMP_VIEW 15 /* View Name NULL */ #define SQLITE_DROP_TRIGGER 16 /* Trigger Name Table Name */ #define SQLITE_DROP_VIEW 17 /* View Name NULL */ #define SQLITE_INSERT 18 /* Table Name NULL */ #define SQLITE_PRAGMA 19 /* Pragma Name 1st arg or NULL */ #define SQLITE_READ 20 /* Table Name Column Name */ #define SQLITE_SELECT 21 /* NULL NULL */ #define SQLITE_TRANSACTION 22 /* NULL NULL */ #define SQLITE_UPDATE 23 /* Table Name Column Name */ #define SQLITE_ATTACH 24 /* Filename NULL */ #define SQLITE_DETACH 25 /* Database Name NULL */ #define SQLITE_ALTER_TABLE 26 /* Database Name Table Name */ #define SQLITE_REINDEX 27 /* Index Name NULL */ #define SQLITE_ANALYZE 28 /* Table Name NULL */ #define SQLITE_CREATE_VTABLE 29 /* Table Name Module Name */ #define SQLITE_DROP_VTABLE 30 /* Table Name Module Name */ #define SQLITE_FUNCTION 31 /* Function Name NULL */ #define SQLITE_COPY 0 /* No longer used */ /* ** CAPI3REF: Tracing And Profiling Functions {F12280} ** ** These routines register callback functions that can be used for ** tracing and profiling the execution of SQL statements. ** ** The callback function registered by sqlite3_trace() is invoked at ** various times when an SQL statement is being run by [sqlite3_step()]. ** The callback returns a UTF-8 rendering of the SQL statement text ** as the statement first begins executing. Additional callbacks occur ** as each triggersubprogram is entered. The callbacks for triggers ** contain a UTF-8 SQL comment that identifies the trigger. ** ** The callback function registered by sqlite3_profile() is invoked ** as each SQL statement finishes. The profile callback contains ** the original statement text and an estimate of wall-clock time ** of how long that statement took to run. ** ** The sqlite3_profile() API is currently considered experimental and ** is subject to change or removal in a future release. ** ** The trigger reporting feature of the trace callback is considered ** experimental and is subject to change or removal in future releases. ** Future versions of SQLite might also add new trace callback ** invocations. ** ** INVARIANTS: ** ** {F12281} The callback function registered by [sqlite3_trace()] is ** whenever an SQL statement first begins to execute and ** whenever a trigger subprogram first begins to run. ** ** {F12282} Each call to [sqlite3_trace()] overrides the previously ** registered trace callback. ** ** {F12283} A NULL trace callback disables tracing. ** ** {F12284} The first argument to the trace callback is a copy of ** the pointer which was the 3rd argument to [sqlite3_trace()]. ** ** {F12285} The second argument to the trace callback is a ** zero-terminated UTF8 string containing the original text ** of the SQL statement as it was passed into [sqlite3_prepare_v2()] ** or the equivalent, or an SQL comment indicating the beginning ** of a trigger subprogram. ** ** {F12287} The callback function registered by [sqlite3_profile()] is invoked ** as each SQL statement finishes. ** ** {F12288} The first parameter to the profile callback is a copy of ** the 3rd parameter to [sqlite3_profile()]. ** ** {F12289} The second parameter to the profile callback is a ** zero-terminated UTF-8 string that contains the complete text of ** the SQL statement as it was processed by [sqlite3_prepare_v2()] ** or the equivalent. ** ** {F12290} The third parameter to the profile callback is an estimate ** of the number of nanoseconds of wall-clock time required to ** run the SQL statement from start to finish. */ SQLITE_API void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*); SQLITE_API void *sqlite3_profile(sqlite3*, void(*xProfile)(void*,const char*,sqlite3_uint64), void*); /* ** CAPI3REF: Query Progress Callbacks {F12910} ** ** This routine configures a callback function - the ** progress callback - that is invoked periodically during long ** running calls to [sqlite3_exec()], [sqlite3_step()] and ** [sqlite3_get_table()]. An example use for this ** interface is to keep a GUI updated during a large query. ** ** If the progress callback returns non-zero, the opertion is ** interrupted. This feature can be used to implement a ** "Cancel" button on a GUI dialog box. ** ** INVARIANTS: ** ** {F12911} The callback function registered by [sqlite3_progress_handler()] ** is invoked periodically during long running calls to ** [sqlite3_step()]. ** ** {F12912} The progress callback is invoked once for every N virtual ** machine opcodes, where N is the second argument to ** the [sqlite3_progress_handler()] call that registered ** the callback. What if N is less than 1? ** ** {F12913} The progress callback itself is identified by the third ** argument to [sqlite3_progress_handler()]. ** ** {F12914} The fourth argument [sqlite3_progress_handler()] is a *** void pointer passed to the progress callback ** function each time it is invoked. ** ** {F12915} If a call to [sqlite3_step()] results in fewer than ** N opcodes being executed, ** then the progress callback is never invoked. {END} ** ** {F12916} Every call to [sqlite3_progress_handler()] ** overwrites any previously registere progress handler. ** ** {F12917} If the progress handler callback is NULL then no progress ** handler is invoked. ** ** {F12918} If the progress callback returns a result other than 0, then ** the behavior is a if [sqlite3_interrupt()] had been called. */ SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*); /* ** CAPI3REF: Opening A New Database Connection {F12700} ** ** These routines open an SQLite database file whose name ** is given by the filename argument. ** The filename argument is interpreted as UTF-8 ** for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16 ** in the native byte order for [sqlite3_open16()]. ** An [sqlite3*] handle is usually returned in *ppDb, even ** if an error occurs. The only exception is if SQLite is unable ** to allocate memory to hold the [sqlite3] object, a NULL will ** be written into *ppDb instead of a pointer to the [sqlite3] object. ** If the database is opened (and/or created) ** successfully, then [SQLITE_OK] is returned. Otherwise an ** error code is returned. The ** [sqlite3_errmsg()] or [sqlite3_errmsg16()] routines can be used to obtain ** an English language description of the error. ** ** The default encoding for the database will be UTF-8 if ** [sqlite3_open()] or [sqlite3_open_v2()] is called and ** UTF-16 in the native byte order if [sqlite3_open16()] is used. ** ** Whether or not an error occurs when it is opened, resources ** associated with the [sqlite3*] handle should be released by passing it ** to [sqlite3_close()] when it is no longer required. ** ** The [sqlite3_open_v2()] interface works like [sqlite3_open()] ** except that it acccepts two additional parameters for additional control ** over the new database connection. The flags parameter can be ** one of: ** **
    **
  1. [SQLITE_OPEN_READONLY] **
  2. [SQLITE_OPEN_READWRITE] **
  3. [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE] **
** ** The first value opens the database read-only. ** If the database does not previously exist, an error is returned. ** The second option opens ** the database for reading and writing if possible, or reading only if ** if the file is write protected. In either case the database ** must already exist or an error is returned. The third option ** opens the database for reading and writing and creates it if it does ** not already exist. ** The third options is behavior that is always used for [sqlite3_open()] ** and [sqlite3_open16()]. ** ** If the 3rd parameter to [sqlite3_open_v2()] is not one of the ** combinations shown above then the behavior is undefined. ** ** If the filename is ":memory:", then an private ** in-memory database is created for the connection. This in-memory ** database will vanish when the database connection is closed. Future ** version of SQLite might make use of additional special filenames ** that begin with the ":" character. It is recommended that ** when a database filename really does begin with ** ":" that you prefix the filename with a pathname like "./" to ** avoid ambiguity. ** ** If the filename is an empty string, then a private temporary ** on-disk database will be created. This private database will be ** automatically deleted as soon as the database connection is closed. ** ** The fourth parameter to sqlite3_open_v2() is the name of the ** [sqlite3_vfs] object that defines the operating system ** interface that the new database connection should use. If the ** fourth parameter is a NULL pointer then the default [sqlite3_vfs] ** object is used. ** ** Note to windows users: The encoding used for the filename argument ** of [sqlite3_open()] and [sqlite3_open_v2()] must be UTF-8, not whatever ** codepage is currently defined. Filenames containing international ** characters must be converted to UTF-8 prior to passing them into ** [sqlite3_open()] or [sqlite3_open_v2()]. ** ** INVARIANTS: ** ** {F12701} The [sqlite3_open()], [sqlite3_open16()], and ** [sqlite3_open_v2()] interfaces create a new ** [database connection] associated with ** the database file given in their first parameter. ** ** {F12702} The filename argument is interpreted as UTF-8 ** for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16 ** in the native byte order for [sqlite3_open16()]. ** ** {F12703} A successful invocation of [sqlite3_open()], [sqlite3_open16()], ** or [sqlite3_open_v2()] writes a pointer to a new ** [database connection] into *ppDb. ** ** {F12704} The [sqlite3_open()], [sqlite3_open16()], and ** [sqlite3_open_v2()] interfaces return [SQLITE_OK] upon success, ** or an appropriate [error code] on failure. ** ** {F12706} The default text encoding for a new database created using ** [sqlite3_open()] or [sqlite3_open_v2()] will be UTF-8. ** ** {F12707} The default text encoding for a new database created using ** [sqlite3_open16()] will be UTF-16. ** ** {F12709} The [sqlite3_open(F,D)] interface is equivalent to ** [sqlite3_open_v2(F,D,G,0)] where the G parameter is ** [SQLITE_OPEN_READWRITE]|[SQLITE_OPEN_CREATE]. ** ** {F12711} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the ** bit value [SQLITE_OPEN_READONLY] then the database is opened ** for reading only. ** ** {F12712} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the ** bit value [SQLITE_OPEN_READWRITE] then the database is opened ** reading and writing if possible, or for reading only if the ** file is write protected by the operating system. ** ** {F12713} If the G parameter to [sqlite3_open(v2(F,D,G,V)] omits the ** bit value [SQLITE_OPEN_CREATE] and the database does not ** previously exist, an error is returned. ** ** {F12714} If the G parameter to [sqlite3_open(v2(F,D,G,V)] contains the ** bit value [SQLITE_OPEN_CREATE] and the database does not ** previously exist, then an attempt is made to create and ** initialize the database. ** ** {F12717} If the filename argument to [sqlite3_open()], [sqlite3_open16()], ** or [sqlite3_open_v2()] is ":memory:", then an private, ** ephemeral, in-memory database is created for the connection. ** Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required ** in sqlite3_open_v2()? ** ** {F12719} If the filename is NULL or an empty string, then a private, ** ephermeral on-disk database will be created. ** Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required ** in sqlite3_open_v2()? ** ** {F12721} The [database connection] created by ** [sqlite3_open_v2(F,D,G,V)] will use the ** [sqlite3_vfs] object identified by the V parameter, or ** the default [sqlite3_vfs] object is V is a NULL pointer. */ SQLITE_API int sqlite3_open( const char *filename, /* Database filename (UTF-8) */ sqlite3 **ppDb /* OUT: SQLite db handle */ ); SQLITE_API int sqlite3_open16( const void *filename, /* Database filename (UTF-16) */ sqlite3 **ppDb /* OUT: SQLite db handle */ ); SQLITE_API int sqlite3_open_v2( const char *filename, /* Database filename (UTF-8) */ sqlite3 **ppDb, /* OUT: SQLite db handle */ int flags, /* Flags */ const char *zVfs /* Name of VFS module to use */ ); /* ** CAPI3REF: Error Codes And Messages {F12800} ** ** The sqlite3_errcode() interface returns the numeric ** [SQLITE_OK | result code] or [SQLITE_IOERR_READ | extended result code] ** for the most recent failed sqlite3_* API call associated ** with [sqlite3] handle 'db'. If a prior API call failed but the ** most recent API call succeeded, the return value from sqlite3_errcode() ** is undefined. ** ** The sqlite3_errmsg() and sqlite3_errmsg16() return English-language ** text that describes the error, as either UTF8 or UTF16 respectively. ** Memory to hold the error message string is managed internally. ** The application does not need to worry with freeing the result. ** However, the error string might be overwritten or deallocated by ** subsequent calls to other SQLite interface functions. ** ** INVARIANTS: ** ** {F12801} The [sqlite3_errcode(D)] interface returns the numeric ** [SQLITE_OK | result code] or ** [SQLITE_IOERR_READ | extended result code] ** for the most recently failed interface call associated ** with [database connection] D. ** ** {F12803} The [sqlite3_errmsg(D)] and [sqlite3_errmsg16(D)] ** interfaces return English-language text that describes ** the error in the mostly recently failed interface call, ** encoded as either UTF8 or UTF16 respectively. ** ** {F12807} The strings returned by [sqlite3_errmsg()] and [sqlite3_errmsg16()] ** are valid until the next SQLite interface call. ** ** {F12808} Calls to API routines that do not return an error code ** (example: [sqlite3_data_count()]) do not ** change the error code or message returned by ** [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()]. ** ** {F12809} Interfaces that are not associated with a specific ** [database connection] (examples: ** [sqlite3_mprintf()] or [sqlite3_enable_shared_cache()] ** do not change the values returned by ** [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()]. */ SQLITE_API int sqlite3_errcode(sqlite3 *db); SQLITE_API const char *sqlite3_errmsg(sqlite3*); SQLITE_API const void *sqlite3_errmsg16(sqlite3*); /* ** CAPI3REF: SQL Statement Object {F13000} ** KEYWORDS: {prepared statement} {prepared statements} ** ** An instance of this object represent single SQL statements. This ** object is variously known as a "prepared statement" or a ** "compiled SQL statement" or simply as a "statement". ** ** The life of a statement object goes something like this: ** **
    **
  1. Create the object using [sqlite3_prepare_v2()] or a related ** function. **
  2. Bind values to host parameters using ** [sqlite3_bind_blob | sqlite3_bind_* interfaces]. **
  3. Run the SQL by calling [sqlite3_step()] one or more times. **
  4. Reset the statement using [sqlite3_reset()] then go back ** to step 2. Do this zero or more times. **
  5. Destroy the object using [sqlite3_finalize()]. **
** ** Refer to documentation on individual methods above for additional ** information. */ typedef struct sqlite3_stmt sqlite3_stmt; /* ** CAPI3REF: Run-time Limits {F12760} ** ** This interface allows the size of various constructs to be limited ** on a connection by connection basis. The first parameter is the ** [database connection] whose limit is to be set or queried. The ** second parameter is one of the [limit categories] that define a ** class of constructs to be size limited. The third parameter is the ** new limit for that construct. The function returns the old limit. ** ** If the new limit is a negative number, the limit is unchanged. ** For the limit category of SQLITE_LIMIT_XYZ there is a hard upper ** bound set by a compile-time C-preprocess macro named SQLITE_MAX_XYZ. ** (The "_LIMIT_" in the name is changed to "_MAX_".) ** Attempts to increase a limit above its hard upper bound are ** silently truncated to the hard upper limit. ** ** Run time limits are intended for use in applications that manage ** both their own internal database and also databases that are controlled ** by untrusted external sources. An example application might be a ** webbrowser that has its own databases for storing history and ** separate databases controlled by javascript applications downloaded ** off the internet. The internal databases can be given the ** large, default limits. Databases managed by external sources can ** be given much smaller limits designed to prevent a denial of service ** attach. Developers might also want to use the [sqlite3_set_authorizer()] ** interface to further control untrusted SQL. The size of the database ** created by an untrusted script can be contained using the ** [max_page_count] [PRAGMA]. ** ** This interface is currently considered experimental and is subject ** to change or removal without prior notice. ** ** INVARIANTS: ** ** {F12762} A successful call to [sqlite3_limit(D,C,V)] where V is ** positive changes the ** limit on the size of construct C in [database connection] D ** to the lessor of V and the hard upper bound on the size ** of C that is set at compile-time. ** ** {F12766} A successful call to [sqlite3_limit(D,C,V)] where V is negative ** leaves the state of [database connection] D unchanged. ** ** {F12769} A successful call to [sqlite3_limit(D,C,V)] returns the ** value of the limit on the size of construct C in ** in [database connection] D as it was prior to the call. */ SQLITE_API int sqlite3_limit(sqlite3*, int id, int newVal); /* ** CAPI3REF: Run-Time Limit Categories {F12790} ** KEYWORDS: {limit category} {limit categories} ** ** These constants define various aspects of a [database connection] ** that can be limited in size by calls to [sqlite3_limit()]. ** The meanings of the various limits are as follows: ** **
**
SQLITE_LIMIT_LENGTH
**
The maximum size of any ** string or blob or table row.
** **
SQLITE_LIMIT_SQL_LENGTH
**
The maximum length of an SQL statement.
** **
SQLITE_LIMIT_COLUMN
**
The maximum number of columns in a table definition or in the ** result set of a SELECT or the maximum number of columns in an index ** or in an ORDER BY or GROUP BY clause.
** **
SQLITE_LIMIT_EXPR_DEPTH
**
The maximum depth of the parse tree on any expression.
** **
SQLITE_LIMIT_COMPOUND_SELECT
**
The maximum number of terms in a compound SELECT statement.
** **
SQLITE_LIMIT_VDBE_OP
**
The maximum number of instructions in a virtual machine program ** used to implement an SQL statement.
** **
SQLITE_LIMIT_FUNCTION_ARG
**
The maximum number of arguments on a function.
** **
SQLITE_LIMIT_ATTACHED
**
The maximum number of attached databases.
** **
SQLITE_LIMIT_LIKE_PATTERN_LENGTH
**
The maximum length of the pattern argument to the LIKE or ** GLOB operators.
** **
SQLITE_LIMIT_VARIABLE_NUMBER
**
The maximum number of variables in an SQL statement that can ** be bound.
**
*/ #define SQLITE_LIMIT_LENGTH 0 #define SQLITE_LIMIT_SQL_LENGTH 1 #define SQLITE_LIMIT_COLUMN 2 #define SQLITE_LIMIT_EXPR_DEPTH 3 #define SQLITE_LIMIT_COMPOUND_SELECT 4 #define SQLITE_LIMIT_VDBE_OP 5 #define SQLITE_LIMIT_FUNCTION_ARG 6 #define SQLITE_LIMIT_ATTACHED 7 #define SQLITE_LIMIT_LIKE_PATTERN_LENGTH 8 #define SQLITE_LIMIT_VARIABLE_NUMBER 9 /* ** CAPI3REF: Compiling An SQL Statement {F13010} ** ** To execute an SQL query, it must first be compiled into a byte-code ** program using one of these routines. ** ** The first argument "db" is an [database connection] ** obtained from a prior call to [sqlite3_open()], [sqlite3_open_v2()] ** or [sqlite3_open16()]. ** The second argument "zSql" is the statement to be compiled, encoded ** as either UTF-8 or UTF-16. The sqlite3_prepare() and sqlite3_prepare_v2() ** interfaces uses UTF-8 and sqlite3_prepare16() and sqlite3_prepare16_v2() ** use UTF-16. {END} ** ** If the nByte argument is less ** than zero, then zSql is read up to the first zero terminator. ** If nByte is non-negative, then it is the maximum number of ** bytes read from zSql. When nByte is non-negative, the ** zSql string ends at either the first '\000' or '\u0000' character or ** the nByte-th byte, whichever comes first. If the caller knows ** that the supplied string is nul-terminated, then there is a small ** performance advantage to be had by passing an nByte parameter that ** is equal to the number of bytes in the input string including ** the nul-terminator bytes.{END} ** ** *pzTail is made to point to the first byte past the end of the ** first SQL statement in zSql. These routines only compiles the first ** statement in zSql, so *pzTail is left pointing to what remains ** uncompiled. ** ** *ppStmt is left pointing to a compiled [prepared statement] that can be ** executed using [sqlite3_step()]. Or if there is an error, *ppStmt is ** set to NULL. If the input text contains no SQL (if the input ** is and empty string or a comment) then *ppStmt is set to NULL. ** {U13018} The calling procedure is responsible for deleting the ** compiled SQL statement ** using [sqlite3_finalize()] after it has finished with it. ** ** On success, [SQLITE_OK] is returned. Otherwise an ** [error code] is returned. ** ** The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are ** recommended for all new programs. The two older interfaces are retained ** for backwards compatibility, but their use is discouraged. ** In the "v2" interfaces, the prepared statement ** that is returned (the [sqlite3_stmt] object) contains a copy of the ** original SQL text. {END} This causes the [sqlite3_step()] interface to ** behave a differently in two ways: ** **
    **
  1. ** If the database schema changes, instead of returning [SQLITE_SCHEMA] as it ** always used to do, [sqlite3_step()] will automatically recompile the SQL ** statement and try to run it again. If the schema has changed in ** a way that makes the statement no longer valid, [sqlite3_step()] will still ** return [SQLITE_SCHEMA]. But unlike the legacy behavior, ** [SQLITE_SCHEMA] is now a fatal error. Calling ** [sqlite3_prepare_v2()] again will not make the ** error go away. Note: use [sqlite3_errmsg()] to find the text ** of the parsing error that results in an [SQLITE_SCHEMA] return. {END} **
    2. ** **
  2. ** When an error occurs, ** [sqlite3_step()] will return one of the detailed ** [error codes] or [extended error codes]. ** The legacy behavior was that [sqlite3_step()] would only return a generic ** [SQLITE_ERROR] result code and you would have to make a second call to ** [sqlite3_reset()] in order to find the underlying cause of the problem. ** With the "v2" prepare interfaces, the underlying reason for the error is ** returned immediately. **
    3. **
** ** INVARIANTS: ** ** {F13011} The [sqlite3_prepare(db,zSql,...)] and ** [sqlite3_prepare_v2(db,zSql,...)] interfaces interpret the ** text in their zSql parameter as UTF-8. ** ** {F13012} The [sqlite3_prepare16(db,zSql,...)] and ** [sqlite3_prepare16_v2(db,zSql,...)] interfaces interpret the ** text in their zSql parameter as UTF-16 in the native byte order. ** ** {F13013} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)] ** and its variants is less than zero, then SQL text is ** read from zSql is read up to the first zero terminator. ** ** {F13014} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)] ** and its variants is non-negative, then at most nBytes bytes ** SQL text is read from zSql. ** ** {F13015} In [sqlite3_prepare_v2(db,zSql,N,P,pzTail)] and its variants ** if the zSql input text contains more than one SQL statement ** and pzTail is not NULL, then *pzTail is made to point to the ** first byte past the end of the first SQL statement in zSql. ** What does *pzTail point to if there is one statement? ** ** {F13016} A successful call to [sqlite3_prepare_v2(db,zSql,N,ppStmt,...)] ** or one of its variants writes into *ppStmt a pointer to a new ** [prepared statement] or a pointer to NULL ** if zSql contains nothing other than whitespace or comments. ** ** {F13019} The [sqlite3_prepare_v2()] interface and its variants return ** [SQLITE_OK] or an appropriate [error code] upon failure. ** ** {F13021} Before [sqlite3_prepare(db,zSql,nByte,ppStmt,pzTail)] or its ** variants returns an error (any value other than [SQLITE_OK]) ** it first sets *ppStmt to NULL. */ SQLITE_API int sqlite3_prepare( sqlite3 *db, /* Database handle */ const char *zSql, /* SQL statement, UTF-8 encoded */ int nByte, /* Maximum length of zSql in bytes. */ sqlite3_stmt **ppStmt, /* OUT: Statement handle */ const char **pzTail /* OUT: Pointer to unused portion of zSql */ ); SQLITE_API int sqlite3_prepare_v2( sqlite3 *db, /* Database handle */ const char *zSql, /* SQL statement, UTF-8 encoded */ int nByte, /* Maximum length of zSql in bytes. */ sqlite3_stmt **ppStmt, /* OUT: Statement handle */ const char **pzTail /* OUT: Pointer to unused portion of zSql */ ); SQLITE_API int sqlite3_prepare16( sqlite3 *db, /* Database handle */ const void *zSql, /* SQL statement, UTF-16 encoded */ int nByte, /* Maximum length of zSql in bytes. */ sqlite3_stmt **ppStmt, /* OUT: Statement handle */ const void **pzTail /* OUT: Pointer to unused portion of zSql */ ); SQLITE_API int sqlite3_prepare16_v2( sqlite3 *db, /* Database handle */ const void *zSql, /* SQL statement, UTF-16 encoded */ int nByte, /* Maximum length of zSql in bytes. */ sqlite3_stmt **ppStmt, /* OUT: Statement handle */ const void **pzTail /* OUT: Pointer to unused portion of zSql */ ); /* ** CAPIREF: Retrieving Statement SQL {F13100} ** ** This intereface can be used to retrieve a saved copy of the original ** SQL text used to create a [prepared statement]. ** ** INVARIANTS: ** ** {F13101} If the [prepared statement] passed as ** the an argument to [sqlite3_sql()] was compiled ** compiled using either [sqlite3_prepare_v2()] or ** [sqlite3_prepare16_v2()], ** then [sqlite3_sql()] function returns a pointer to a ** zero-terminated string containing a UTF-8 rendering ** of the original SQL statement. ** ** {F13102} If the [prepared statement] passed as ** the an argument to [sqlite3_sql()] was compiled ** compiled using either [sqlite3_prepare()] or ** [sqlite3_prepare16()], ** then [sqlite3_sql()] function returns a NULL pointer. ** ** {F13103} The string returned by [sqlite3_sql(S)] is valid until the ** [prepared statement] S is deleted using [sqlite3_finalize(S)]. */ SQLITE_API const char *sqlite3_sql(sqlite3_stmt *pStmt); /* ** CAPI3REF: Dynamically Typed Value Object {F15000} ** KEYWORDS: {protected sqlite3_value} {unprotected sqlite3_value} ** ** SQLite uses the sqlite3_value object to represent all values ** that can be stored in a database table. ** SQLite uses dynamic typing for the values it stores. ** Values stored in sqlite3_value objects can be ** be integers, floating point values, strings, BLOBs, or NULL. ** ** An sqlite3_value object may be either "protected" or "unprotected". ** Some interfaces require a protected sqlite3_value. Other interfaces ** will accept either a protected or an unprotected sqlite3_value. ** Every interface that accepts sqlite3_value arguments specifies ** whether or not it requires a protected sqlite3_value. ** ** The terms "protected" and "unprotected" refer to whether or not ** a mutex is held. A internal mutex is held for a protected ** sqlite3_value object but no mutex is held for an unprotected ** sqlite3_value object. If SQLite is compiled to be single-threaded ** (with SQLITE_THREADSAFE=0 and with [sqlite3_threadsafe()] returning 0) ** then there is no distinction between ** protected and unprotected sqlite3_value objects and they can be ** used interchangable. However, for maximum code portability it ** is recommended that applications make the distinction between ** between protected and unprotected sqlite3_value objects even if ** they are single threaded. ** ** The sqlite3_value objects that are passed as parameters into the ** implementation of application-defined SQL functions are protected. ** The sqlite3_value object returned by ** [sqlite3_column_value()] is unprotected. ** Unprotected sqlite3_value objects may only be used with ** [sqlite3_result_value()] and [sqlite3_bind_value()]. All other ** interfaces that use sqlite3_value require protected sqlite3_value objects. */ typedef struct Mem sqlite3_value; /* ** CAPI3REF: SQL Function Context Object {F16001} ** ** The context in which an SQL function executes is stored in an ** sqlite3_context object. A pointer to an sqlite3_context ** object is always first parameter to application-defined SQL functions. */ typedef struct sqlite3_context sqlite3_context; /* ** CAPI3REF: Binding Values To Prepared Statements {F13500} ** ** In the SQL strings input to [sqlite3_prepare_v2()] and its ** variants, literals may be replace by a parameter in one ** of these forms: ** **
    **
  • ? **
  • ?NNN **
  • :VVV **
  • @VVV **
  • $VVV **
** ** In the parameter forms shown above NNN is an integer literal, ** VVV alpha-numeric parameter name. ** The values of these parameters (also called "host parameter names" ** or "SQL parameters") ** can be set using the sqlite3_bind_*() routines defined here. ** ** The first argument to the sqlite3_bind_*() routines always ** is a pointer to the [sqlite3_stmt] object returned from ** [sqlite3_prepare_v2()] or its variants. The second ** argument is the index of the parameter to be set. The ** first parameter has an index of 1. When the same named ** parameter is used more than once, second and subsequent ** occurrences have the same index as the first occurrence. ** The index for named parameters can be looked up using the ** [sqlite3_bind_parameter_name()] API if desired. The index ** for "?NNN" parameters is the value of NNN. ** The NNN value must be between 1 and the compile-time ** parameter SQLITE_MAX_VARIABLE_NUMBER (default value: 999). ** ** The third argument is the value to bind to the parameter. ** ** In those ** routines that have a fourth argument, its value is the number of bytes ** in the parameter. To be clear: the value is the number of bytes ** in the value, not the number of characters. ** If the fourth parameter is negative, the length of the string is ** number of bytes up to the first zero terminator. ** ** The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and ** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or ** string after SQLite has finished with it. If the fifth argument is ** the special value [SQLITE_STATIC], then SQLite assumes that the ** information is in static, unmanaged space and does not need to be freed. ** If the fifth argument has the value [SQLITE_TRANSIENT], then ** SQLite makes its own private copy of the data immediately, before ** the sqlite3_bind_*() routine returns. ** ** The sqlite3_bind_zeroblob() routine binds a BLOB of length N that ** is filled with zeros. A zeroblob uses a fixed amount of memory ** (just an integer to hold it size) while it is being processed. ** Zeroblobs are intended to serve as place-holders for BLOBs whose ** content is later written using ** [sqlite3_blob_open | increment BLOB I/O] routines. A negative ** value for the zeroblob results in a zero-length BLOB. ** ** The sqlite3_bind_*() routines must be called after ** [sqlite3_prepare_v2()] (and its variants) or [sqlite3_reset()] and ** before [sqlite3_step()]. ** Bindings are not cleared by the [sqlite3_reset()] routine. ** Unbound parameters are interpreted as NULL. ** ** These routines return [SQLITE_OK] on success or an error code if ** anything goes wrong. [SQLITE_RANGE] is returned if the parameter ** index is out of range. [SQLITE_NOMEM] is returned if malloc fails. ** [SQLITE_MISUSE] might be returned if these routines are called on a ** virtual machine that is the wrong state or which has already been finalized. ** Detection of misuse is unreliable. Applications should not depend ** on SQLITE_MISUSE returns. SQLITE_MISUSE is intended to indicate a ** a logic error in the application. Future versions of SQLite might ** panic rather than return SQLITE_MISUSE. ** ** See also: [sqlite3_bind_parameter_count()], ** [sqlite3_bind_parameter_name()], and ** [sqlite3_bind_parameter_index()]. ** ** INVARIANTS: ** ** {F13506} The [sqlite3_prepare | SQL statement compiler] recognizes ** tokens of the forms "?", "?NNN", "$VVV", ":VVV", and "@VVV" ** as SQL parameters, where NNN is any sequence of one or more ** digits and where VVV is any sequence of one or more ** alphanumeric characters or "::" optionally followed by ** a string containing no spaces and contained within parentheses. ** ** {F13509} The initial value of an SQL parameter is NULL. ** ** {F13512} The index of an "?" SQL parameter is one larger than the ** largest index of SQL parameter to the left, or 1 if ** the "?" is the leftmost SQL parameter. ** ** {F13515} The index of an "?NNN" SQL parameter is the integer NNN. ** ** {F13518} The index of an ":VVV", "$VVV", or "@VVV" SQL parameter is ** the same as the index of leftmost occurances of the same ** parameter, or one more than the largest index over all ** parameters to the left if this is the first occurrance ** of this parameter, or 1 if this is the leftmost parameter. ** ** {F13521} The [sqlite3_prepare | SQL statement compiler] fail with ** an [SQLITE_RANGE] error if the index of an SQL parameter ** is less than 1 or greater than SQLITE_MAX_VARIABLE_NUMBER. ** ** {F13524} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,V,...)] ** associate the value V with all SQL parameters having an ** index of N in the [prepared statement] S. ** ** {F13527} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,...)] ** override prior calls with the same values of S and N. ** ** {F13530} Bindings established by [sqlite3_bind_text | sqlite3_bind(S,...)] ** persist across calls to [sqlite3_reset(S)]. ** ** {F13533} In calls to [sqlite3_bind_blob(S,N,V,L,D)], ** [sqlite3_bind_text(S,N,V,L,D)], or ** [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds the first L ** bytes of the blob or string pointed to by V, when L ** is non-negative. ** ** {F13536} In calls to [sqlite3_bind_text(S,N,V,L,D)] or ** [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds characters ** from V through the first zero character when L is negative. ** ** {F13539} In calls to [sqlite3_bind_blob(S,N,V,L,D)], ** [sqlite3_bind_text(S,N,V,L,D)], or ** [sqlite3_bind_text16(S,N,V,L,D)] when D is the special ** constant [SQLITE_STATIC], SQLite assumes that the value V ** is held in static unmanaged space that will not change ** during the lifetime of the binding. ** ** {F13542} In calls to [sqlite3_bind_blob(S,N,V,L,D)], ** [sqlite3_bind_text(S,N,V,L,D)], or ** [sqlite3_bind_text16(S,N,V,L,D)] when D is the special ** constant [SQLITE_TRANSIENT], the routine makes a ** private copy of V value before it returns. ** ** {F13545} In calls to [sqlite3_bind_blob(S,N,V,L,D)], ** [sqlite3_bind_text(S,N,V,L,D)], or ** [sqlite3_bind_text16(S,N,V,L,D)] when D is a pointer to ** a function, SQLite invokes that function to destroy the ** V value after it has finished using the V value. ** ** {F13548} In calls to [sqlite3_bind_zeroblob(S,N,V,L)] the value bound ** is a blob of L bytes, or a zero-length blob if L is negative. ** ** {F13551} In calls to [sqlite3_bind_value(S,N,V)] the V argument may ** be either a [protected sqlite3_value] object or an ** [unprotected sqlite3_value] object. */ SQLITE_API int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*)); SQLITE_API int sqlite3_bind_double(sqlite3_stmt*, int, double); SQLITE_API int sqlite3_bind_int(sqlite3_stmt*, int, int); SQLITE_API int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64); SQLITE_API int sqlite3_bind_null(sqlite3_stmt*, int); SQLITE_API int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*)); SQLITE_API int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*)); SQLITE_API int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*); SQLITE_API int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n); /* ** CAPI3REF: Number Of SQL Parameters {F13600} ** ** This routine can be used to find the number of SQL parameters ** in a prepared statement. SQL parameters are tokens of the ** form "?", "?NNN", ":AAA", "$AAA", or "@AAA" that serve as ** place-holders for values that are [sqlite3_bind_blob | bound] ** to the parameters at a later time. ** ** This routine actually returns the index of the largest parameter. ** For all forms except ?NNN, this will correspond to the number of ** unique parameters. If parameters of the ?NNN are used, there may ** be gaps in the list. ** ** See also: [sqlite3_bind_blob|sqlite3_bind()], ** [sqlite3_bind_parameter_name()], and ** [sqlite3_bind_parameter_index()]. ** ** INVARIANTS: ** ** {F13601} The [sqlite3_bind_parameter_count(S)] interface returns ** the largest index of all SQL parameters in the ** [prepared statement] S, or 0 if S ** contains no SQL parameters. */ SQLITE_API int sqlite3_bind_parameter_count(sqlite3_stmt*); /* ** CAPI3REF: Name Of A Host Parameter {F13620} ** ** This routine returns a pointer to the name of the n-th ** SQL parameter in a [prepared statement]. ** SQL parameters of the form "?NNN" or ":AAA" or "@AAA" or "$AAA" ** have a name which is the string "?NNN" or ":AAA" or "@AAA" or "$AAA" ** respectively. ** In other words, the initial ":" or "$" or "@" or "?" ** is included as part of the name. ** Parameters of the form "?" without a following integer have no name. ** ** The first host parameter has an index of 1, not 0. ** ** If the value n is out of range or if the n-th parameter is ** nameless, then NULL is returned. The returned string is ** always in the UTF-8 encoding even if the named parameter was ** originally specified as UTF-16 in [sqlite3_prepare16()] or ** [sqlite3_prepare16_v2()]. ** ** See also: [sqlite3_bind_blob|sqlite3_bind()], ** [sqlite3_bind_parameter_count()], and ** [sqlite3_bind_parameter_index()]. ** ** INVARIANTS: ** ** {F13621} The [sqlite3_bind_parameter_name(S,N)] interface returns ** a UTF-8 rendering of the name of the SQL parameter in ** [prepared statement] S having index N, or ** NULL if there is no SQL parameter with index N or if the ** parameter with index N is an anonymous parameter "?". */ SQLITE_API const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int); /* ** CAPI3REF: Index Of A Parameter With A Given Name {F13640} ** ** Return the index of an SQL parameter given its name. The ** index value returned is suitable for use as the second ** parameter to [sqlite3_bind_blob|sqlite3_bind()]. A zero ** is returned if no matching parameter is found. The parameter ** name must be given in UTF-8 even if the original statement ** was prepared from UTF-16 text using [sqlite3_prepare16_v2()]. ** ** See also: [sqlite3_bind_blob|sqlite3_bind()], ** [sqlite3_bind_parameter_count()], and ** [sqlite3_bind_parameter_index()]. ** ** INVARIANTS: ** ** {F13641} The [sqlite3_bind_parameter_index(S,N)] interface returns ** the index of SQL parameter in [prepared statement] ** S whose name matches the UTF-8 string N, or 0 if there is ** no match. */ SQLITE_API int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName); /* ** CAPI3REF: Reset All Bindings On A Prepared Statement {F13660} ** ** Contrary to the intuition of many, [sqlite3_reset()] does not ** reset the [sqlite3_bind_blob | bindings] on a ** [prepared statement]. Use this routine to ** reset all host parameters to NULL. ** ** INVARIANTS: ** ** {F13661} The [sqlite3_clear_bindings(S)] interface resets all ** SQL parameter bindings in [prepared statement] S ** back to NULL. */ SQLITE_API int sqlite3_clear_bindings(sqlite3_stmt*); /* ** CAPI3REF: Number Of Columns In A Result Set {F13710} ** ** Return the number of columns in the result set returned by the ** [prepared statement]. This routine returns 0 ** if pStmt is an SQL statement that does not return data (for ** example an UPDATE). ** ** INVARIANTS: ** ** {F13711} The [sqlite3_column_count(S)] interface returns the number of ** columns in the result set generated by the ** [prepared statement] S, or 0 if S does not generate ** a result set. */ SQLITE_API int sqlite3_column_count(sqlite3_stmt *pStmt); /* ** CAPI3REF: Column Names In A Result Set {F13720} ** ** These routines return the name assigned to a particular column ** in the result set of a SELECT statement. The sqlite3_column_name() ** interface returns a pointer to a zero-terminated UTF8 string ** and sqlite3_column_name16() returns a pointer to a zero-terminated ** UTF16 string. The first parameter is the ** [prepared statement] that implements the SELECT statement. ** The second parameter is the column number. The left-most column is ** number 0. ** ** The returned string pointer is valid until either the ** [prepared statement] is destroyed by [sqlite3_finalize()] ** or until the next call sqlite3_column_name() or sqlite3_column_name16() ** on the same column. ** ** If sqlite3_malloc() fails during the processing of either routine ** (for example during a conversion from UTF-8 to UTF-16) then a ** NULL pointer is returned. ** ** The name of a result column is the value of the "AS" clause for ** that column, if there is an AS clause. If there is no AS clause ** then the name of the column is unspecified and may change from ** one release of SQLite to the next. ** ** INVARIANTS: ** ** {F13721} A successful invocation of the [sqlite3_column_name(S,N)] ** interface returns the name ** of the Nth column (where 0 is the left-most column) for the ** result set of [prepared statement] S as a ** zero-terminated UTF-8 string. ** ** {F13723} A successful invocation of the [sqlite3_column_name16(S,N)] ** interface returns the name ** of the Nth column (where 0 is the left-most column) for the ** result set of [prepared statement] S as a ** zero-terminated UTF-16 string in the native byte order. ** ** {F13724} The [sqlite3_column_name()] and [sqlite3_column_name16()] ** interfaces return a NULL pointer if they are unable to ** allocate memory memory to hold there normal return strings. ** ** {F13725} If the N parameter to [sqlite3_column_name(S,N)] or ** [sqlite3_column_name16(S,N)] is out of range, then the ** interfaces returns a NULL pointer. ** ** {F13726} The strings returned by [sqlite3_column_name(S,N)] and ** [sqlite3_column_name16(S,N)] are valid until the next ** call to either routine with the same S and N parameters ** or until [sqlite3_finalize(S)] is called. ** ** {F13727} When a result column of a [SELECT] statement contains ** an AS clause, the name of that column is the indentifier ** to the right of the AS keyword. */ SQLITE_API const char *sqlite3_column_name(sqlite3_stmt*, int N); SQLITE_API const void *sqlite3_column_name16(sqlite3_stmt*, int N); /* ** CAPI3REF: Source Of Data In A Query Result {F13740} ** ** These routines provide a means to determine what column of what ** table in which database a result of a SELECT statement comes from. ** The name of the database or table or column can be returned as ** either a UTF8 or UTF16 string. The _database_ routines return ** the database name, the _table_ routines return the table name, and ** the origin_ routines return the column name. ** The returned string is valid until ** the [prepared statement] is destroyed using ** [sqlite3_finalize()] or until the same information is requested ** again in a different encoding. ** ** The names returned are the original un-aliased names of the ** database, table, and column. ** ** The first argument to the following calls is a [prepared statement]. ** These functions return information about the Nth column returned by ** the statement, where N is the second function argument. ** ** If the Nth column returned by the statement is an expression ** or subquery and is not a column value, then all of these functions ** return NULL. These routine might also return NULL if a memory ** allocation error occurs. Otherwise, they return the ** name of the attached database, table and column that query result ** column was extracted from. ** ** As with all other SQLite APIs, those postfixed with "16" return ** UTF-16 encoded strings, the other functions return UTF-8. {END} ** ** These APIs are only available if the library was compiled with the ** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined. ** ** {U13751} ** If two or more threads call one or more of these routines against the same ** prepared statement and column at the same time then the results are ** undefined. ** ** INVARIANTS: ** ** {F13741} The [sqlite3_column_database_name(S,N)] interface returns either ** the UTF-8 zero-terminated name of the database from which the ** Nth result column of [prepared statement] S ** is extracted, or NULL if the the Nth column of S is a ** general expression or if unable to allocate memory ** to store the name. ** ** {F13742} The [sqlite3_column_database_name16(S,N)] interface returns either ** the UTF-16 native byte order ** zero-terminated name of the database from which the ** Nth result column of [prepared statement] S ** is extracted, or NULL if the the Nth column of S is a ** general expression or if unable to allocate memory ** to store the name. ** ** {F13743} The [sqlite3_column_table_name(S,N)] interface returns either ** the UTF-8 zero-terminated name of the table from which the ** Nth result column of [prepared statement] S ** is extracted, or NULL if the the Nth column of S is a ** general expression or if unable to allocate memory ** to store the name. ** ** {F13744} The [sqlite3_column_table_name16(S,N)] interface returns either ** the UTF-16 native byte order ** zero-terminated name of the table from which the ** Nth result column of [prepared statement] S ** is extracted, or NULL if the the Nth column of S is a ** general expression or if unable to allocate memory ** to store the name. ** ** {F13745} The [sqlite3_column_origin_name(S,N)] interface returns either ** the UTF-8 zero-terminated name of the table column from which the ** Nth result column of [prepared statement] S ** is extracted, or NULL if the the Nth column of S is a ** general expression or if unable to allocate memory ** to store the name. ** ** {F13746} The [sqlite3_column_origin_name16(S,N)] interface returns either ** the UTF-16 native byte order ** zero-terminated name of the table column from which the ** Nth result column of [prepared statement] S ** is extracted, or NULL if the the Nth column of S is a ** general expression or if unable to allocate memory ** to store the name. ** ** {F13748} The return values from ** [sqlite3_column_database_name|column metadata interfaces] ** are valid ** for the lifetime of the [prepared statement] ** or until the encoding is changed by another metadata ** interface call for the same prepared statement and column. ** ** LIMITATIONS: ** ** {U13751} If two or more threads call one or more ** [sqlite3_column_database_name|column metadata interfaces] ** the same [prepared statement] and result column ** at the same time then the results are undefined. */ SQLITE_API const char *sqlite3_column_database_name(sqlite3_stmt*,int); SQLITE_API const void *sqlite3_column_database_name16(sqlite3_stmt*,int); SQLITE_API const char *sqlite3_column_table_name(sqlite3_stmt*,int); SQLITE_API const void *sqlite3_column_table_name16(sqlite3_stmt*,int); SQLITE_API const char *sqlite3_column_origin_name(sqlite3_stmt*,int); SQLITE_API const void *sqlite3_column_origin_name16(sqlite3_stmt*,int); /* ** CAPI3REF: Declared Datatype Of A Query Result {F13760} ** ** The first parameter is a [prepared statement]. ** If this statement is a SELECT statement and the Nth column of the ** returned result set of that SELECT is a table column (not an ** expression or subquery) then the declared type of the table ** column is returned. If the Nth column of the result set is an ** expression or subquery, then a NULL pointer is returned. ** The returned string is always UTF-8 encoded. {END} ** For example, in the database schema: ** ** CREATE TABLE t1(c1 VARIANT); ** ** And the following statement compiled: ** ** SELECT c1 + 1, c1 FROM t1; ** ** Then this routine would return the string "VARIANT" for the second ** result column (i==1), and a NULL pointer for the first result column ** (i==0). ** ** SQLite uses dynamic run-time typing. So just because a column ** is declared to contain a particular type does not mean that the ** data stored in that column is of the declared type. SQLite is ** strongly typed, but the typing is dynamic not static. Type ** is associated with individual values, not with the containers ** used to hold those values. ** ** INVARIANTS: ** ** {F13761} A successful call to [sqlite3_column_decltype(S,N)] ** returns a zero-terminated UTF-8 string containing the ** the declared datatype of the table column that appears ** as the Nth column (numbered from 0) of the result set to the ** [prepared statement] S. ** ** {F13762} A successful call to [sqlite3_column_decltype16(S,N)] ** returns a zero-terminated UTF-16 native byte order string ** containing the declared datatype of the table column that appears ** as the Nth column (numbered from 0) of the result set to the ** [prepared statement] S. ** ** {F13763} If N is less than 0 or N is greater than or equal to ** the number of columns in [prepared statement] S ** or if the Nth column of S is an expression or subquery rather ** than a table column or if a memory allocation failure ** occurs during encoding conversions, then ** calls to [sqlite3_column_decltype(S,N)] or ** [sqlite3_column_decltype16(S,N)] return NULL. */ SQLITE_API const char *sqlite3_column_decltype(sqlite3_stmt*,int); SQLITE_API const void *sqlite3_column_decltype16(sqlite3_stmt*,int); /* ** CAPI3REF: Evaluate An SQL Statement {F13200} ** ** After an [prepared statement] has been prepared with a call ** to either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or to one of ** the legacy interfaces [sqlite3_prepare()] or [sqlite3_prepare16()], ** then this function must be called one or more times to evaluate the ** statement. ** ** The details of the behavior of this sqlite3_step() interface depend ** on whether the statement was prepared using the newer "v2" interface ** [sqlite3_prepare_v2()] and [sqlite3_prepare16_v2()] or the older legacy ** interface [sqlite3_prepare()] and [sqlite3_prepare16()]. The use of the ** new "v2" interface is recommended for new applications but the legacy ** interface will continue to be supported. ** ** In the legacy interface, the return value will be either [SQLITE_BUSY], ** [SQLITE_DONE], [SQLITE_ROW], [SQLITE_ERROR], or [SQLITE_MISUSE]. ** With the "v2" interface, any of the other [SQLITE_OK | result code] ** or [SQLITE_IOERR_READ | extended result code] might be returned as ** well. ** ** [SQLITE_BUSY] means that the database engine was unable to acquire the ** database locks it needs to do its job. If the statement is a COMMIT ** or occurs outside of an explicit transaction, then you can retry the ** statement. If the statement is not a COMMIT and occurs within a ** explicit transaction then you should rollback the transaction before ** continuing. ** ** [SQLITE_DONE] means that the statement has finished executing ** successfully. sqlite3_step() should not be called again on this virtual ** machine without first calling [sqlite3_reset()] to reset the virtual ** machine back to its initial state. ** ** If the SQL statement being executed returns any data, then ** [SQLITE_ROW] is returned each time a new row of data is ready ** for processing by the caller. The values may be accessed using ** the [sqlite3_column_int | column access functions]. ** sqlite3_step() is called again to retrieve the next row of data. ** ** [SQLITE_ERROR] means that a run-time error (such as a constraint ** violation) has occurred. sqlite3_step() should not be called again on ** the VM. More information may be found by calling [sqlite3_errmsg()]. ** With the legacy interface, a more specific error code (example: ** [SQLITE_INTERRUPT], [SQLITE_SCHEMA], [SQLITE_CORRUPT], and so forth) ** can be obtained by calling [sqlite3_reset()] on the ** [prepared statement]. In the "v2" interface, ** the more specific error code is returned directly by sqlite3_step(). ** ** [SQLITE_MISUSE] means that the this routine was called inappropriately. ** Perhaps it was called on a [prepared statement] that has ** already been [sqlite3_finalize | finalized] or on one that had ** previously returned [SQLITE_ERROR] or [SQLITE_DONE]. Or it could ** be the case that the same database connection is being used by two or ** more threads at the same moment in time. ** ** Goofy Interface Alert: ** In the legacy interface, ** the sqlite3_step() API always returns a generic error code, ** [SQLITE_ERROR], following any error other than [SQLITE_BUSY] ** and [SQLITE_MISUSE]. You must call [sqlite3_reset()] or ** [sqlite3_finalize()] in order to find one of the specific ** [error codes] that better describes the error. ** We admit that this is a goofy design. The problem has been fixed ** with the "v2" interface. If you prepare all of your SQL statements ** using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] instead ** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()], then the ** more specific [error codes] are returned directly ** by sqlite3_step(). The use of the "v2" interface is recommended. ** ** INVARIANTS: ** ** {F13202} If [prepared statement] S is ready to be ** run, then [sqlite3_step(S)] advances that prepared statement ** until to completion or until it is ready to return another ** row of the result set or an interrupt or run-time error occurs. ** ** {F15304} When a call to [sqlite3_step(S)] causes the ** [prepared statement] S to run to completion, ** the function returns [SQLITE_DONE]. ** ** {F15306} When a call to [sqlite3_step(S)] stops because it is ready ** to return another row of the result set, it returns ** [SQLITE_ROW]. ** ** {F15308} If a call to [sqlite3_step(S)] encounters an ** [sqlite3_interrupt|interrupt] or a run-time error, ** it returns an appropraite error code that is not one of ** [SQLITE_OK], [SQLITE_ROW], or [SQLITE_DONE]. ** ** {F15310} If an [sqlite3_interrupt|interrupt] or run-time error ** occurs during a call to [sqlite3_step(S)] ** for a [prepared statement] S created using ** legacy interfaces [sqlite3_prepare()] or ** [sqlite3_prepare16()] then the function returns either ** [SQLITE_ERROR], [SQLITE_BUSY], or [SQLITE_MISUSE]. */ SQLITE_API int sqlite3_step(sqlite3_stmt*); /* ** CAPI3REF: Number of columns in a result set {F13770} ** ** Return the number of values in the current row of the result set. ** ** INVARIANTS: ** ** {F13771} After a call to [sqlite3_step(S)] that returns ** [SQLITE_ROW], the [sqlite3_data_count(S)] routine ** will return the same value as the ** [sqlite3_column_count(S)] function. ** ** {F13772} After [sqlite3_step(S)] has returned any value other than ** [SQLITE_ROW] or before [sqlite3_step(S)] has been ** called on the [prepared statement] for ** the first time since it was [sqlite3_prepare|prepared] ** or [sqlite3_reset|reset], the [sqlite3_data_count(S)] ** routine returns zero. */ SQLITE_API int sqlite3_data_count(sqlite3_stmt *pStmt); /* ** CAPI3REF: Fundamental Datatypes {F10265} ** KEYWORDS: SQLITE_TEXT ** ** {F10266}Every value in SQLite has one of five fundamental datatypes: ** **
    **
  • 64-bit signed integer **
  • 64-bit IEEE floating point number **
  • string **
  • BLOB **
  • NULL **
{END} ** ** These constants are codes for each of those types. ** ** Note that the SQLITE_TEXT constant was also used in SQLite version 2 ** for a completely different meaning. Software that links against both ** SQLite version 2 and SQLite version 3 should use SQLITE3_TEXT not ** SQLITE_TEXT. */ #define SQLITE_INTEGER 1 #define SQLITE_FLOAT 2 #define SQLITE_BLOB 4 #define SQLITE_NULL 5 #ifdef SQLITE_TEXT # undef SQLITE_TEXT #else # define SQLITE_TEXT 3 #endif #define SQLITE3_TEXT 3 /* ** CAPI3REF: Results Values From A Query {F13800} ** ** These routines form the "result set query" interface. ** ** These routines return information about ** a single column of the current result row of a query. In every ** case the first argument is a pointer to the ** [prepared statement] that is being ** evaluated (the [sqlite3_stmt*] that was returned from ** [sqlite3_prepare_v2()] or one of its variants) and ** the second argument is the index of the column for which information ** should be returned. The left-most column of the result set ** has an index of 0. ** ** If the SQL statement is not currently point to a valid row, or if the ** the column index is out of range, the result is undefined. ** These routines may only be called when the most recent call to ** [sqlite3_step()] has returned [SQLITE_ROW] and neither ** [sqlite3_reset()] nor [sqlite3_finalize()] has been call subsequently. ** If any of these routines are called after [sqlite3_reset()] or ** [sqlite3_finalize()] or after [sqlite3_step()] has returned ** something other than [SQLITE_ROW], the results are undefined. ** If [sqlite3_step()] or [sqlite3_reset()] or [sqlite3_finalize()] ** are called from a different thread while any of these routines ** are pending, then the results are undefined. ** ** The sqlite3_column_type() routine returns ** [SQLITE_INTEGER | datatype code] for the initial data type ** of the result column. The returned value is one of [SQLITE_INTEGER], ** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL]. The value ** returned by sqlite3_column_type() is only meaningful if no type ** conversions have occurred as described below. After a type conversion, ** the value returned by sqlite3_column_type() is undefined. Future ** versions of SQLite may change the behavior of sqlite3_column_type() ** following a type conversion. ** ** If the result is a BLOB or UTF-8 string then the sqlite3_column_bytes() ** routine returns the number of bytes in that BLOB or string. ** If the result is a UTF-16 string, then sqlite3_column_bytes() converts ** the string to UTF-8 and then returns the number of bytes. ** If the result is a numeric value then sqlite3_column_bytes() uses ** [sqlite3_snprintf()] to convert that value to a UTF-8 string and returns ** the number of bytes in that string. ** The value returned does not include the zero terminator at the end ** of the string. For clarity: the value returned is the number of ** bytes in the string, not the number of characters. ** ** Strings returned by sqlite3_column_text() and sqlite3_column_text16(), ** even empty strings, are always zero terminated. The return ** value from sqlite3_column_blob() for a zero-length blob is an arbitrary ** pointer, possibly even a NULL pointer. ** ** The sqlite3_column_bytes16() routine is similar to sqlite3_column_bytes() ** but leaves the result in UTF-16 in native byte order instead of UTF-8. ** The zero terminator is not included in this count. ** ** The object returned by [sqlite3_column_value()] is an ** [unprotected sqlite3_value] object. An unprotected sqlite3_value object ** may only be used with [sqlite3_bind_value()] and [sqlite3_result_value()]. ** If the [unprotected sqlite3_value] object returned by ** [sqlite3_column_value()] is used in any other way, including calls ** to routines like ** [sqlite3_value_int()], [sqlite3_value_text()], or [sqlite3_value_bytes()], ** then the behavior is undefined. ** ** These routines attempt to convert the value where appropriate. For ** example, if the internal representation is FLOAT and a text result ** is requested, [sqlite3_snprintf()] is used internally to do the conversion ** automatically. The following table details the conversions that ** are applied: ** **
** **
Internal
Type 		Requested
Type 		Conversion ** **
NULL INTEGER Result is 0 **
NULL FLOAT Result is 0.0 **
NULL TEXT Result is NULL pointer **
NULL BLOB Result is NULL pointer **
INTEGER FLOAT Convert from integer to float **
INTEGER TEXT ASCII rendering of the integer **
INTEGER BLOB Same as for INTEGER->TEXT **
FLOAT INTEGER Convert from float to integer **
FLOAT TEXT ASCII rendering of the float **
FLOAT BLOB Same as FLOAT->TEXT **
TEXT INTEGER Use atoi() **
TEXT FLOAT Use atof() **
TEXT BLOB No change **
BLOB INTEGER Convert to TEXT then use atoi() **
BLOB FLOAT Convert to TEXT then use atof() **
BLOB TEXT Add a zero terminator if needed **
**
** ** The table above makes reference to standard C library functions atoi() ** and atof(). SQLite does not really use these functions. It has its ** on equavalent internal routines. The atoi() and atof() names are ** used in the table for brevity and because they are familiar to most ** C programmers. ** ** Note that when type conversions occur, pointers returned by prior ** calls to sqlite3_column_blob(), sqlite3_column_text(), and/or ** sqlite3_column_text16() may be invalidated. ** Type conversions and pointer invalidations might occur ** in the following cases: ** **
    **

  • The initial content is a BLOB and sqlite3_column_text() ** or sqlite3_column_text16() is called. A zero-terminator might ** need to be added to the string.

    • ** **

  • The initial content is UTF-8 text and sqlite3_column_bytes16() or ** sqlite3_column_text16() is called. The content must be converted ** to UTF-16.

    • ** **

  • The initial content is UTF-16 text and sqlite3_column_bytes() or ** sqlite3_column_text() is called. The content must be converted ** to UTF-8.

    • **
** ** Conversions between UTF-16be and UTF-16le are always done in place and do ** not invalidate a prior pointer, though of course the content of the buffer ** that the prior pointer points to will have been modified. Other kinds ** of conversion are done in place when it is possible, but sometime it is ** not possible and in those cases prior pointers are invalidated. ** ** The safest and easiest to remember policy is to invoke these routines ** in one of the following ways: ** **
    **
  • sqlite3_column_text() followed by sqlite3_column_bytes()
    • **
  • sqlite3_column_blob() followed by sqlite3_column_bytes()
    • **
  • sqlite3_column_text16() followed by sqlite3_column_bytes16()
    • **
** ** In other words, you should call sqlite3_column_text(), sqlite3_column_blob(), ** or sqlite3_column_text16() first to force the result into the desired ** format, then invoke sqlite3_column_bytes() or sqlite3_column_bytes16() to ** find the size of the result. Do not mix call to sqlite3_column_text() or ** sqlite3_column_blob() with calls to sqlite3_column_bytes16(). And do not ** mix calls to sqlite3_column_text16() with calls to sqlite3_column_bytes(). ** ** The pointers returned are valid until a type conversion occurs as ** described above, or until [sqlite3_step()] or [sqlite3_reset()] or ** [sqlite3_finalize()] is called. The memory space used to hold strings ** and blobs is freed automatically. Do not pass the pointers returned ** [sqlite3_column_blob()], [sqlite3_column_text()], etc. into ** [sqlite3_free()]. ** ** If a memory allocation error occurs during the evaluation of any ** of these routines, a default value is returned. The default value ** is either the integer 0, the floating point number 0.0, or a NULL ** pointer. Subsequent calls to [sqlite3_errcode()] will return ** [SQLITE_NOMEM]. ** ** INVARIANTS: ** ** {F13803} The [sqlite3_column_blob(S,N)] interface converts the ** Nth column in the current row of the result set for ** [prepared statement] S into a blob and then returns a ** pointer to the converted value. ** ** {F13806} The [sqlite3_column_bytes(S,N)] interface returns the ** number of bytes in the blob or string (exclusive of the ** zero terminator on the string) that was returned by the ** most recent call to [sqlite3_column_blob(S,N)] or ** [sqlite3_column_text(S,N)]. ** ** {F13809} The [sqlite3_column_bytes16(S,N)] interface returns the ** number of bytes in the string (exclusive of the ** zero terminator on the string) that was returned by the ** most recent call to [sqlite3_column_text16(S,N)]. ** ** {F13812} The [sqlite3_column_double(S,N)] interface converts the ** Nth column in the current row of the result set for ** [prepared statement] S into a floating point value and ** returns a copy of that value. ** ** {F13815} The [sqlite3_column_int(S,N)] interface converts the ** Nth column in the current row of the result set for ** [prepared statement] S into a 64-bit signed integer and ** returns the lower 32 bits of that integer. ** ** {F13818} The [sqlite3_column_int64(S,N)] interface converts the ** Nth column in the current row of the result set for ** [prepared statement] S into a 64-bit signed integer and ** returns a copy of that integer. ** ** {F13821} The [sqlite3_column_text(S,N)] interface converts the ** Nth column in the current row of the result set for ** [prepared statement] S into a zero-terminated UTF-8 ** string and returns a pointer to that string. ** ** {F13824} The [sqlite3_column_text16(S,N)] interface converts the ** Nth column in the current row of the result set for ** [prepared statement] S into a zero-terminated 2-byte ** aligned UTF-16 native byte order ** string and returns a pointer to that string. ** ** {F13827} The [sqlite3_column_type(S,N)] interface returns ** one of [SQLITE_NULL], [SQLITE_INTEGER], [SQLITE_FLOAT], ** [SQLITE_TEXT], or [SQLITE_BLOB] as appropriate for ** the Nth column in the current row of the result set for ** [prepared statement] S. ** ** {F13830} The [sqlite3_column_value(S,N)] interface returns a ** pointer to an [unprotected sqlite3_value] object for the ** Nth column in the current row of the result set for ** [prepared statement] S. */ SQLITE_API const void *sqlite3_column_blob(sqlite3_stmt*, int iCol); SQLITE_API int sqlite3_column_bytes(sqlite3_stmt*, int iCol); SQLITE_API int sqlite3_column_bytes16(sqlite3_stmt*, int iCol); SQLITE_API double sqlite3_column_double(sqlite3_stmt*, int iCol); SQLITE_API int sqlite3_column_int(sqlite3_stmt*, int iCol); SQLITE_API sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol); SQLITE_API const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol); SQLITE_API const void *sqlite3_column_text16(sqlite3_stmt*, int iCol); SQLITE_API int sqlite3_column_type(sqlite3_stmt*, int iCol); SQLITE_API sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol); /* ** CAPI3REF: Destroy A Prepared Statement Object {F13300} ** ** The sqlite3_finalize() function is called to delete a ** [prepared statement]. If the statement was ** executed successfully, or not executed at all, then SQLITE_OK is returned. ** If execution of the statement failed then an ** [error code] or [extended error code] ** is returned. ** ** This routine can be called at any point during the execution of the ** [prepared statement]. If the virtual machine has not ** completed execution when this routine is called, that is like ** encountering an error or an interrupt. (See [sqlite3_interrupt()].) ** Incomplete updates may be rolled back and transactions cancelled, ** depending on the circumstances, and the ** [error code] returned will be [SQLITE_ABORT]. ** ** INVARIANTS: ** ** {F11302} The [sqlite3_finalize(S)] interface destroys the ** [prepared statement] S and releases all ** memory and file resources held by that object. ** ** {F11304} If the most recent call to [sqlite3_step(S)] for the ** [prepared statement] S returned an error, ** then [sqlite3_finalize(S)] returns that same error. */ SQLITE_API int sqlite3_finalize(sqlite3_stmt *pStmt); /* ** CAPI3REF: Reset A Prepared Statement Object {F13330} ** ** The sqlite3_reset() function is called to reset a ** [prepared statement] object. ** back to its initial state, ready to be re-executed. ** Any SQL statement variables that had values bound to them using ** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values. ** Use [sqlite3_clear_bindings()] to reset the bindings. ** ** {F11332} The [sqlite3_reset(S)] interface resets the [prepared statement] S ** back to the beginning of its program. ** ** {F11334} If the most recent call to [sqlite3_step(S)] for ** [prepared statement] S returned [SQLITE_ROW] or [SQLITE_DONE], ** or if [sqlite3_step(S)] has never before been called on S, ** then [sqlite3_reset(S)] returns [SQLITE_OK]. ** ** {F11336} If the most recent call to [sqlite3_step(S)] for ** [prepared statement] S indicated an error, then ** [sqlite3_reset(S)] returns an appropriate [error code]. ** ** {F11338} The [sqlite3_reset(S)] interface does not change the values ** of any [sqlite3_bind_blob|bindings] on [prepared statement] S. */ SQLITE_API int sqlite3_reset(sqlite3_stmt *pStmt); /* ** CAPI3REF: Create Or Redefine SQL Functions {F16100} ** KEYWORDS: {function creation routines} ** ** These two functions (collectively known as ** "function creation routines") are used to add SQL functions or aggregates ** or to redefine the behavior of existing SQL functions or aggregates. The ** difference only between the two is that the second parameter, the ** name of the (scalar) function or aggregate, is encoded in UTF-8 for ** sqlite3_create_function() and UTF-16 for sqlite3_create_function16(). ** ** The first parameter is the [database connection] to which the SQL ** function is to be added. If a single ** program uses more than one [database connection] internally, then SQL ** functions must be added individually to each [database connection]. ** ** The second parameter is the name of the SQL function to be created ** or redefined. ** The length of the name is limited to 255 bytes, exclusive of the ** zero-terminator. Note that the name length limit is in bytes, not ** characters. Any attempt to create a function with a longer name ** will result in an SQLITE_ERROR error. ** ** The third parameter is the number of arguments that the SQL function or ** aggregate takes. If this parameter is negative, then the SQL function or ** aggregate may take any number of arguments. ** ** The fourth parameter, eTextRep, specifies what ** [SQLITE_UTF8 | text encoding] this SQL function prefers for ** its parameters. Any SQL function implementation should be able to work ** work with UTF-8, UTF-16le, or UTF-16be. But some implementations may be ** more efficient with one encoding than another. It is allowed to ** invoke sqlite3_create_function() or sqlite3_create_function16() multiple ** times with the same function but with different values of eTextRep. ** When multiple implementations of the same function are available, SQLite ** will pick the one that involves the least amount of data conversion. ** If there is only a single implementation which does not care what ** text encoding is used, then the fourth argument should be ** [SQLITE_ANY]. ** ** The fifth parameter is an arbitrary pointer. The implementation ** of the function can gain access to this pointer using ** [sqlite3_user_data()]. ** ** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are ** pointers to C-language functions that implement the SQL ** function or aggregate. A scalar SQL function requires an implementation of ** the xFunc callback only, NULL pointers should be passed as the xStep ** and xFinal parameters. An aggregate SQL function requires an implementation ** of xStep and xFinal and NULL should be passed for xFunc. To delete an ** existing SQL function or aggregate, pass NULL for all three function ** callback. ** ** It is permitted to register multiple implementations of the same ** functions with the same name but with either differing numbers of ** arguments or differing perferred text encodings. SQLite will use ** the implementation most closely matches the way in which the ** SQL function is used. ** ** INVARIANTS: ** ** {F16103} The [sqlite3_create_function16()] interface behaves exactly ** like [sqlite3_create_function()] in every way except that it ** interprets the zFunctionName argument as ** zero-terminated UTF-16 native byte order instead of as a ** zero-terminated UTF-8. ** ** {F16106} A successful invocation of ** the [sqlite3_create_function(D,X,N,E,...)] interface registers ** or replaces callback functions in [database connection] D ** used to implement the SQL function named X with N parameters ** and having a perferred text encoding of E. ** ** {F16109} A successful call to [sqlite3_create_function(D,X,N,E,P,F,S,L)] ** replaces the P, F, S, and L values from any prior calls with ** the same D, X, N, and E values. ** ** {F16112} The [sqlite3_create_function(D,X,...)] interface fails with ** a return code of [SQLITE_ERROR] if the SQL function name X is ** longer than 255 bytes exclusive of the zero terminator. ** ** {F16118} Either F must be NULL and S and L are non-NULL or else F ** is non-NULL and S and L are NULL, otherwise ** [sqlite3_create_function(D,X,N,E,P,F,S,L)] returns [SQLITE_ERROR]. ** ** {F16121} The [sqlite3_create_function(D,...)] interface fails with an ** error code of [SQLITE_BUSY] if there exist [prepared statements] ** associated with the [database connection] D. ** ** {F16124} The [sqlite3_create_function(D,X,N,...)] interface fails with an ** error code of [SQLITE_ERROR] if parameter N (specifying the number ** of arguments to the SQL function being registered) is less ** than -1 or greater than 127. ** ** {F16127} When N is non-negative, the [sqlite3_create_function(D,X,N,...)] ** interface causes callbacks to be invoked for the SQL function ** named X when the number of arguments to the SQL function is ** exactly N. ** ** {F16130} When N is -1, the [sqlite3_create_function(D,X,N,...)] ** interface causes callbacks to be invoked for the SQL function ** named X with any number of arguments. ** ** {F16133} When calls to [sqlite3_create_function(D,X,N,...)] ** specify multiple implementations of the same function X ** and when one implementation has N>=0 and the other has N=(-1) ** the implementation with a non-zero N is preferred. ** ** {F16136} When calls to [sqlite3_create_function(D,X,N,E,...)] ** specify multiple implementations of the same function X with ** the same number of arguments N but with different ** encodings E, then the implementation where E matches the ** database encoding is preferred. ** ** {F16139} For an aggregate SQL function created using ** [sqlite3_create_function(D,X,N,E,P,0,S,L)] the finializer ** function L will always be invoked exactly once if the ** step function S is called one or more times. ** ** {F16142} When SQLite invokes either the xFunc or xStep function of ** an application-defined SQL function or aggregate created ** by [sqlite3_create_function()] or [sqlite3_create_function16()], ** then the array of [sqlite3_value] objects passed as the ** third parameter are always [protected sqlite3_value] objects. */ SQLITE_API int sqlite3_create_function( sqlite3 *db, const char *zFunctionName, int nArg, int eTextRep, void *pApp, void (*xFunc)(sqlite3_context*,int,sqlite3_value**), void (*xStep)(sqlite3_context*,int,sqlite3_value**), void (*xFinal)(sqlite3_context*) ); SQLITE_API int sqlite3_create_function16( sqlite3 *db, const void *zFunctionName, int nArg, int eTextRep, void *pApp, void (*xFunc)(sqlite3_context*,int,sqlite3_value**), void (*xStep)(sqlite3_context*,int,sqlite3_value**), void (*xFinal)(sqlite3_context*) ); /* ** CAPI3REF: Text Encodings {F10267} ** ** These constant define integer codes that represent the various ** text encodings supported by SQLite. */ #define SQLITE_UTF8 1 #define SQLITE_UTF16LE 2 #define SQLITE_UTF16BE 3 #define SQLITE_UTF16 4 /* Use native byte order */ #define SQLITE_ANY 5 /* sqlite3_create_function only */ #define SQLITE_UTF16_ALIGNED 8 /* sqlite3_create_collation only */ /* ** CAPI3REF: Obsolete Functions ** ** These functions are all now obsolete. In order to maintain ** backwards compatibility with older code, we continue to support ** these functions. However, new development projects should avoid ** the use of these functions. To help encourage people to avoid ** using these functions, we are not going to tell you want they do. */ SQLITE_API int sqlite3_aggregate_count(sqlite3_context*); SQLITE_API int sqlite3_expired(sqlite3_stmt*); SQLITE_API int sqlite3_transfer_bindings(sqlite3_stmt*, sqlite3_stmt*); SQLITE_API int sqlite3_global_recover(void); SQLITE_API void sqlite3_thread_cleanup(void); SQLITE_API int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),void*,sqlite3_int64); /* ** CAPI3REF: Obtaining SQL Function Parameter Values {F15100} ** ** The C-language implementation of SQL functions and aggregates uses ** this set of interface routines to access the parameter values on ** the function or aggregate. ** ** The xFunc (for scalar functions) or xStep (for aggregates) parameters ** to [sqlite3_create_function()] and [sqlite3_create_function16()] ** define callbacks that implement the SQL functions and aggregates. ** The 4th parameter to these callbacks is an array of pointers to ** [protected sqlite3_value] objects. There is one [sqlite3_value] object for ** each parameter to the SQL function. These routines are used to ** extract values from the [sqlite3_value] objects. ** ** These routines work only with [protected sqlite3_value] objects. ** Any attempt to use these routines on an [unprotected sqlite3_value] ** object results in undefined behavior. ** ** These routines work just like the corresponding ** [sqlite3_column_blob | sqlite3_column_* routines] except that ** these routines take a single [protected sqlite3_value] object pointer ** instead of an [sqlite3_stmt*] pointer and an integer column number. ** ** The sqlite3_value_text16() interface extracts a UTF16 string ** in the native byte-order of the host machine. The ** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces ** extract UTF16 strings as big-endian and little-endian respectively. ** ** The sqlite3_value_numeric_type() interface attempts to apply ** numeric affinity to the value. This means that an attempt is ** made to convert the value to an integer or floating point. If ** such a conversion is possible without loss of information (in other ** words if the value is a string that looks like a number) ** then the conversion is done. Otherwise no conversion occurs. The ** [SQLITE_INTEGER | datatype] after conversion is returned. ** ** Please pay particular attention to the fact that the pointer that ** is returned from [sqlite3_value_blob()], [sqlite3_value_text()], or ** [sqlite3_value_text16()] can be invalidated by a subsequent call to ** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite3_value_text()], ** or [sqlite3_value_text16()]. ** ** These routines must be called from the same thread as ** the SQL function that supplied the [sqlite3_value*] parameters. ** ** ** INVARIANTS: ** ** {F15103} The [sqlite3_value_blob(V)] interface converts the ** [protected sqlite3_value] object V into a blob and then returns a ** pointer to the converted value. ** ** {F15106} The [sqlite3_value_bytes(V)] interface returns the ** number of bytes in the blob or string (exclusive of the ** zero terminator on the string) that was returned by the ** most recent call to [sqlite3_value_blob(V)] or ** [sqlite3_value_text(V)]. ** ** {F15109} The [sqlite3_value_bytes16(V)] interface returns the ** number of bytes in the string (exclusive of the ** zero terminator on the string) that was returned by the ** most recent call to [sqlite3_value_text16(V)], ** [sqlite3_value_text16be(V)], or [sqlite3_value_text16le(V)]. ** ** {F15112} The [sqlite3_value_double(V)] interface converts the ** [protected sqlite3_value] object V into a floating point value and ** returns a copy of that value. ** ** {F15115} The [sqlite3_value_int(V)] interface converts the ** [protected sqlite3_value] object V into a 64-bit signed integer and ** returns the lower 32 bits of that integer. ** ** {F15118} The [sqlite3_value_int64(V)] interface converts the ** [protected sqlite3_value] object V into a 64-bit signed integer and ** returns a copy of that integer. ** ** {F15121} The [sqlite3_value_text(V)] interface converts the ** [protected sqlite3_value] object V into a zero-terminated UTF-8 ** string and returns a pointer to that string. ** ** {F15124} The [sqlite3_value_text16(V)] interface converts the ** [protected sqlite3_value] object V into a zero-terminated 2-byte ** aligned UTF-16 native byte order ** string and returns a pointer to that string. ** ** {F15127} The [sqlite3_value_text16be(V)] interface converts the ** [protected sqlite3_value] object V into a zero-terminated 2-byte ** aligned UTF-16 big-endian ** string and returns a pointer to that string. ** ** {F15130} The [sqlite3_value_text16le(V)] interface converts the ** [protected sqlite3_value] object V into a zero-terminated 2-byte ** aligned UTF-16 little-endian ** string and returns a pointer to that string. ** ** {F15133} The [sqlite3_value_type(V)] interface returns ** one of [SQLITE_NULL], [SQLITE_INTEGER], [SQLITE_FLOAT], ** [SQLITE_TEXT], or [SQLITE_BLOB] as appropriate for ** the [sqlite3_value] object V. ** ** {F15136} The [sqlite3_value_numeric_type(V)] interface converts ** the [protected sqlite3_value] object V into either an integer or ** a floating point value if it can do so without loss of ** information, and returns one of [SQLITE_NULL], ** [SQLITE_INTEGER], [SQLITE_FLOAT], [SQLITE_TEXT], or ** [SQLITE_BLOB] as appropriate for ** the [protected sqlite3_value] object V after the conversion attempt. */ SQLITE_API const void *sqlite3_value_blob(sqlite3_value*); SQLITE_API int sqlite3_value_bytes(sqlite3_value*); SQLITE_API int sqlite3_value_bytes16(sqlite3_value*); SQLITE_API double sqlite3_value_double(sqlite3_value*); SQLITE_API int sqlite3_value_int(sqlite3_value*); SQLITE_API sqlite3_int64 sqlite3_value_int64(sqlite3_value*); SQLITE_API const unsigned char *sqlite3_value_text(sqlite3_value*); SQLITE_API const void *sqlite3_value_text16(sqlite3_value*); SQLITE_API const void *sqlite3_value_text16le(sqlite3_value*); SQLITE_API const void *sqlite3_value_text16be(sqlite3_value*); SQLITE_API int sqlite3_value_type(sqlite3_value*); SQLITE_API int sqlite3_value_numeric_type(sqlite3_value*); /* ** CAPI3REF: Obtain Aggregate Function Context {F16210} ** ** The implementation of aggregate SQL functions use this routine to allocate ** a structure for storing their state. ** The first time the sqlite3_aggregate_context() routine is ** is called for a particular aggregate, SQLite allocates nBytes of memory ** zeros that memory, and returns a pointer to it. ** On second and subsequent calls to sqlite3_aggregate_context() ** for the same aggregate function index, the same buffer is returned. ** The implementation ** of the aggregate can use the returned buffer to accumulate data. ** ** SQLite automatically frees the allocated buffer when the aggregate ** query concludes. ** ** The first parameter should be a copy of the ** [sqlite3_context | SQL function context] that is the first ** parameter to the callback routine that implements the aggregate ** function. ** ** This routine must be called from the same thread in which ** the aggregate SQL function is running. ** ** INVARIANTS: ** ** {F16211} The first invocation of [sqlite3_aggregate_context(C,N)] for ** a particular instance of an aggregate function (for a particular ** context C) causes SQLite to allocation N bytes of memory, ** zero that memory, and return a pointer to the allocationed ** memory. ** ** {F16213} If a memory allocation error occurs during ** [sqlite3_aggregate_context(C,N)] then the function returns 0. ** ** {F16215} Second and subsequent invocations of ** [sqlite3_aggregate_context(C,N)] for the same context pointer C ** ignore the N parameter and return a pointer to the same ** block of memory returned by the first invocation. ** ** {F16217} The memory allocated by [sqlite3_aggregate_context(C,N)] is ** automatically freed on the next call to [sqlite3_reset()] ** or [sqlite3_finalize()] for the [prepared statement] containing ** the aggregate function associated with context C. */ SQLITE_API void *sqlite3_aggregate_context(sqlite3_context*, int nBytes); /* ** CAPI3REF: User Data For Functions {F16240} ** ** The sqlite3_user_data() interface returns a copy of ** the pointer that was the pUserData parameter (the 5th parameter) ** of the the [sqlite3_create_function()] ** and [sqlite3_create_function16()] routines that originally ** registered the application defined function. {END} ** ** This routine must be called from the same thread in which ** the application-defined function is running. ** ** INVARIANTS: ** ** {F16243} The [sqlite3_user_data(C)] interface returns a copy of the ** P pointer from the [sqlite3_create_function(D,X,N,E,P,F,S,L)] ** or [sqlite3_create_function16(D,X,N,E,P,F,S,L)] call that ** registered the SQL function associated with ** [sqlite3_context] C. */ SQLITE_API void *sqlite3_user_data(sqlite3_context*); /* ** CAPI3REF: Database Connection For Functions {F16250} ** ** The sqlite3_context_db_handle() interface returns a copy of ** the pointer to the [database connection] (the 1st parameter) ** of the the [sqlite3_create_function()] ** and [sqlite3_create_function16()] routines that originally ** registered the application defined function. ** ** INVARIANTS: ** ** {F16253} The [sqlite3_context_db_handle(C)] interface returns a copy of the ** D pointer from the [sqlite3_create_function(D,X,N,E,P,F,S,L)] ** or [sqlite3_create_function16(D,X,N,E,P,F,S,L)] call that ** registered the SQL function associated with ** [sqlite3_context] C. */ SQLITE_API sqlite3 *sqlite3_context_db_handle(sqlite3_context*); /* ** CAPI3REF: Function Auxiliary Data {F16270} ** ** The following two functions may be used by scalar SQL functions to ** associate meta-data with argument values. If the same value is passed to ** multiple invocations of the same SQL function during query execution, under ** some circumstances the associated meta-data may be preserved. This may ** be used, for example, to add a regular-expression matching scalar ** function. The compiled version of the regular expression is stored as ** meta-data associated with the SQL value passed as the regular expression ** pattern. The compiled regular expression can be reused on multiple ** invocations of the same function so that the original pattern string ** does not need to be recompiled on each invocation. ** ** The sqlite3_get_auxdata() interface returns a pointer to the meta-data ** associated by the sqlite3_set_auxdata() function with the Nth argument ** value to the application-defined function. ** If no meta-data has been ever been set for the Nth ** argument of the function, or if the cooresponding function parameter ** has changed since the meta-data was set, then sqlite3_get_auxdata() ** returns a NULL pointer. ** ** The sqlite3_set_auxdata() interface saves the meta-data ** pointed to by its 3rd parameter as the meta-data for the N-th ** argument of the application-defined function. Subsequent ** calls to sqlite3_get_auxdata() might return this data, if it has ** not been destroyed. ** If it is not NULL, SQLite will invoke the destructor ** function given by the 4th parameter to sqlite3_set_auxdata() on ** the meta-data when the corresponding function parameter changes ** or when the SQL statement completes, whichever comes first. ** ** SQLite is free to call the destructor and drop meta-data on ** any parameter of any function at any time. The only guarantee ** is that the destructor will be called before the metadata is ** dropped. ** ** In practice, meta-data is preserved between function calls for ** expressions that are constant at compile time. This includes literal ** values and SQL variables. ** ** These routines must be called from the same thread in which ** the SQL function is running. ** ** INVARIANTS: ** ** {F16272} The [sqlite3_get_auxdata(C,N)] interface returns a pointer ** to metadata associated with the Nth parameter of the SQL function ** whose context is C, or NULL if there is no metadata associated ** with that parameter. ** ** {F16274} The [sqlite3_set_auxdata(C,N,P,D)] interface assigns a metadata ** pointer P to the Nth parameter of the SQL function with context ** C. ** ** {F16276} SQLite will invoke the destructor D with a single argument ** which is the metadata pointer P following a call to ** [sqlite3_set_auxdata(C,N,P,D)] when SQLite ceases to hold ** the metadata. ** ** {F16277} SQLite ceases to hold metadata for an SQL function parameter ** when the value of that parameter changes. ** ** {F16278} When [sqlite3_set_auxdata(C,N,P,D)] is invoked, the destructor ** is called for any prior metadata associated with the same function ** context C and parameter N. ** ** {F16279} SQLite will call destructors for any metadata it is holding ** in a particular [prepared statement] S when either ** [sqlite3_reset(S)] or [sqlite3_finalize(S)] is called. */ SQLITE_API void *sqlite3_get_auxdata(sqlite3_context*, int N); SQLITE_API void sqlite3_set_auxdata(sqlite3_context*, int N, void*, void (*)(void*)); /* ** CAPI3REF: Constants Defining Special Destructor Behavior {F10280} ** ** These are special value for the destructor that is passed in as the ** final argument to routines like [sqlite3_result_blob()]. If the destructor ** argument is SQLITE_STATIC, it means that the content pointer is constant ** and will never change. It does not need to be destroyed. The ** SQLITE_TRANSIENT value means that the content will likely change in ** the near future and that SQLite should make its own private copy of ** the content before returning. ** ** The typedef is necessary to work around problems in certain ** C++ compilers. See ticket #2191. */ typedef void (*sqlite3_destructor_type)(void*); #define SQLITE_STATIC ((sqlite3_destructor_type)0) #define SQLITE_TRANSIENT ((sqlite3_destructor_type)-1) /* ** CAPI3REF: Setting The Result Of An SQL Function {F16400} ** ** These routines are used by the xFunc or xFinal callbacks that ** implement SQL functions and aggregates. See ** [sqlite3_create_function()] and [sqlite3_create_function16()] ** for additional information. ** ** These functions work very much like the ** [sqlite3_bind_blob | sqlite3_bind_*] family of functions used ** to bind values to host parameters in prepared statements. ** Refer to the ** [sqlite3_bind_blob | sqlite3_bind_* documentation] for ** additional information. ** ** The sqlite3_result_blob() interface sets the result from ** an application defined function to be the BLOB whose content is pointed ** to by the second parameter and which is N bytes long where N is the ** third parameter. ** The sqlite3_result_zeroblob() inerfaces set the result of ** the application defined function to be a BLOB containing all zero ** bytes and N bytes in size, where N is the value of the 2nd parameter. ** ** The sqlite3_result_double() interface sets the result from ** an application defined function to be a floating point value specified ** by its 2nd argument. ** ** The sqlite3_result_error() and sqlite3_result_error16() functions ** cause the implemented SQL function to throw an exception. ** SQLite uses the string pointed to by the ** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16() ** as the text of an error message. SQLite interprets the error ** message string from sqlite3_result_error() as UTF8. SQLite ** interprets the string from sqlite3_result_error16() as UTF16 in native ** byte order. If the third parameter to sqlite3_result_error() ** or sqlite3_result_error16() is negative then SQLite takes as the error ** message all text up through the first zero character. ** If the third parameter to sqlite3_result_error() or ** sqlite3_result_error16() is non-negative then SQLite takes that many ** bytes (not characters) from the 2nd parameter as the error message. ** The sqlite3_result_error() and sqlite3_result_error16() ** routines make a copy private copy of the error message text before ** they return. Hence, the calling function can deallocate or ** modify the text after they return without harm. ** The sqlite3_result_error_code() function changes the error code ** returned by SQLite as a result of an error in a function. By default, ** the error code is SQLITE_ERROR. A subsequent call to sqlite3_result_error() ** or sqlite3_result_error16() resets the error code to SQLITE_ERROR. ** ** The sqlite3_result_toobig() interface causes SQLite ** to throw an error indicating that a string or BLOB is to long ** to represent. The sqlite3_result_nomem() interface ** causes SQLite to throw an exception indicating that the a ** memory allocation failed. ** ** The sqlite3_result_int() interface sets the return value ** of the application-defined function to be the 32-bit signed integer ** value given in the 2nd argument. ** The sqlite3_result_int64() interface sets the return value ** of the application-defined function to be the 64-bit signed integer ** value given in the 2nd argument. ** ** The sqlite3_result_null() interface sets the return value ** of the application-defined function to be NULL. ** ** The sqlite3_result_text(), sqlite3_result_text16(), ** sqlite3_result_text16le(), and sqlite3_result_text16be() interfaces ** set the return value of the application-defined function to be ** a text string which is represented as UTF-8, UTF-16 native byte order, ** UTF-16 little endian, or UTF-16 big endian, respectively. ** SQLite takes the text result from the application from ** the 2nd parameter of the sqlite3_result_text* interfaces. ** If the 3rd parameter to the sqlite3_result_text* interfaces ** is negative, then SQLite takes result text from the 2nd parameter ** through the first zero character. ** If the 3rd parameter to the sqlite3_result_text* interfaces ** is non-negative, then as many bytes (not characters) of the text ** pointed to by the 2nd parameter are taken as the application-defined ** function result. ** If the 4th parameter to the sqlite3_result_text* interfaces ** or sqlite3_result_blob is a non-NULL pointer, then SQLite calls that ** function as the destructor on the text or blob result when it has ** finished using that result. ** If the 4th parameter to the sqlite3_result_text* interfaces ** or sqlite3_result_blob is the special constant SQLITE_STATIC, then ** SQLite assumes that the text or blob result is constant space and ** does not copy the space or call a destructor when it has ** finished using that result. ** If the 4th parameter to the sqlite3_result_text* interfaces ** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT ** then SQLite makes a copy of the result into space obtained from ** from [sqlite3_malloc()] before it returns. ** ** The sqlite3_result_value() interface sets the result of ** the application-defined function to be a copy the ** [unprotected sqlite3_value] object specified by the 2nd parameter. The ** sqlite3_result_value() interface makes a copy of the [sqlite3_value] ** so that [sqlite3_value] specified in the parameter may change or ** be deallocated after sqlite3_result_value() returns without harm. ** A [protected sqlite3_value] object may always be used where an ** [unprotected sqlite3_value] object is required, so either ** kind of [sqlite3_value] object can be used with this interface. ** ** If these routines are called from within the different thread ** than the one containing the application-defined function that recieved ** the [sqlite3_context] pointer, the results are undefined. ** ** INVARIANTS: ** ** {F16403} The default return value from any SQL function is NULL. ** ** {F16406} The [sqlite3_result_blob(C,V,N,D)] interface changes the ** return value of function C to be a blob that is N bytes ** in length and with content pointed to by V. ** ** {F16409} The [sqlite3_result_double(C,V)] interface changes the ** return value of function C to be the floating point value V. ** ** {F16412} The [sqlite3_result_error(C,V,N)] interface changes the return ** value of function C to be an exception with error code ** [SQLITE_ERROR] and a UTF8 error message copied from V up to the ** first zero byte or until N bytes are read if N is positive. ** ** {F16415} The [sqlite3_result_error16(C,V,N)] interface changes the return ** value of function C to be an exception with error code ** [SQLITE_ERROR] and a UTF16 native byte order error message ** copied from V up to the first zero terminator or until N bytes ** are read if N is positive. ** ** {F16418} The [sqlite3_result_error_toobig(C)] interface changes the return ** value of the function C to be an exception with error code ** [SQLITE_TOOBIG] and an appropriate error message. ** ** {F16421} The [sqlite3_result_error_nomem(C)] interface changes the return ** value of the function C to be an exception with error code ** [SQLITE_NOMEM] and an appropriate error message. ** ** {F16424} The [sqlite3_result_error_code(C,E)] interface changes the return ** value of the function C to be an exception with error code E. ** The error message text is unchanged. ** ** {F16427} The [sqlite3_result_int(C,V)] interface changes the ** return value of function C to be the 32-bit integer value V. ** ** {F16430} The [sqlite3_result_int64(C,V)] interface changes the ** return value of function C to be the 64-bit integer value V. ** ** {F16433} The [sqlite3_result_null(C)] interface changes the ** return value of function C to be NULL. ** ** {F16436} The [sqlite3_result_text(C,V,N,D)] interface changes the ** return value of function C to be the UTF8 string ** V up to the first zero if N is negative ** or the first N bytes of V if N is non-negative. ** ** {F16439} The [sqlite3_result_text16(C,V,N,D)] interface changes the ** return value of function C to be the UTF16 native byte order ** string V up to the first zero if N is ** negative or the first N bytes of V if N is non-negative. ** ** {F16442} The [sqlite3_result_text16be(C,V,N,D)] interface changes the ** return value of function C to be the UTF16 big-endian ** string V up to the first zero if N is ** is negative or the first N bytes or V if N is non-negative. ** ** {F16445} The [sqlite3_result_text16le(C,V,N,D)] interface changes the ** return value of function C to be the UTF16 little-endian ** string V up to the first zero if N is ** negative or the first N bytes of V if N is non-negative. ** ** {F16448} The [sqlite3_result_value(C,V)] interface changes the ** return value of function C to be [unprotected sqlite3_value] ** object V. ** ** {F16451} The [sqlite3_result_zeroblob(C,N)] interface changes the ** return value of function C to be an N-byte blob of all zeros. ** ** {F16454} The [sqlite3_result_error()] and [sqlite3_result_error16()] ** interfaces make a copy of their error message strings before ** returning. ** ** {F16457} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)], ** [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)], ** [sqlite3_result_text16be(C,V,N,D)], or ** [sqlite3_result_text16le(C,V,N,D)] is the constant [SQLITE_STATIC] ** then no destructor is ever called on the pointer V and SQLite ** assumes that V is immutable. ** ** {F16460} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)], ** [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)], ** [sqlite3_result_text16be(C,V,N,D)], or ** [sqlite3_result_text16le(C,V,N,D)] is the constant ** [SQLITE_TRANSIENT] then the interfaces makes a copy of the ** content of V and retains the copy. ** ** {F16463} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)], ** [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)], ** [sqlite3_result_text16be(C,V,N,D)], or ** [sqlite3_result_text16le(C,V,N,D)] is some value other than ** the constants [SQLITE_STATIC] and [SQLITE_TRANSIENT] then ** SQLite will invoke the destructor D with V as its only argument ** when it has finished with the V value. */ SQLITE_API void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*)); SQLITE_API void sqlite3_result_double(sqlite3_context*, double); SQLITE_API void sqlite3_result_error(sqlite3_context*, const char*, int); SQLITE_API void sqlite3_result_error16(sqlite3_context*, const void*, int); SQLITE_API void sqlite3_result_error_toobig(sqlite3_context*); SQLITE_API void sqlite3_result_error_nomem(sqlite3_context*); SQLITE_API void sqlite3_result_error_code(sqlite3_context*, int); SQLITE_API void sqlite3_result_int(sqlite3_context*, int); SQLITE_API void sqlite3_result_int64(sqlite3_context*, sqlite3_int64); SQLITE_API void sqlite3_result_null(sqlite3_context*); SQLITE_API void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*)); SQLITE_API void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*)); SQLITE_API void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*)); SQLITE_API void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*)); SQLITE_API void sqlite3_result_value(sqlite3_context*, sqlite3_value*); SQLITE_API void sqlite3_result_zeroblob(sqlite3_context*, int n); /* ** CAPI3REF: Define New Collating Sequences {F16600} ** ** These functions are used to add new collation sequences to the ** [sqlite3*] handle specified as the first argument. ** ** The name of the new collation sequence is specified as a UTF-8 string ** for sqlite3_create_collation() and sqlite3_create_collation_v2() ** and a UTF-16 string for sqlite3_create_collation16(). In all cases ** the name is passed as the second function argument. ** ** The third argument may be one of the constants [SQLITE_UTF8], ** [SQLITE_UTF16LE] or [SQLITE_UTF16BE], indicating that the user-supplied ** routine expects to be passed pointers to strings encoded using UTF-8, ** UTF-16 little-endian or UTF-16 big-endian respectively. The ** third argument might also be [SQLITE_UTF16_ALIGNED] to indicate that ** the routine expects pointers to 16-bit word aligned strings ** of UTF16 in the native byte order of the host computer. ** ** A pointer to the user supplied routine must be passed as the fifth ** argument. If it is NULL, this is the same as deleting the collation ** sequence (so that SQLite cannot call it anymore). ** Each time the application ** supplied function is invoked, it is passed a copy of the void* passed as ** the fourth argument to sqlite3_create_collation() or ** sqlite3_create_collation16() as its first parameter. ** ** The remaining arguments to the application-supplied routine are two strings, ** each represented by a (length, data) pair and encoded in the encoding ** that was passed as the third argument when the collation sequence was ** registered. {END} The application defined collation routine should ** return negative, zero or positive if ** the first string is less than, equal to, or greater than the second ** string. i.e. (STRING1 - STRING2). ** ** The sqlite3_create_collation_v2() works like sqlite3_create_collation() ** excapt that it takes an extra argument which is a destructor for ** the collation. The destructor is called when the collation is ** destroyed and is passed a copy of the fourth parameter void* pointer ** of the sqlite3_create_collation_v2(). ** Collations are destroyed when ** they are overridden by later calls to the collation creation functions ** or when the [sqlite3*] database handle is closed using [sqlite3_close()]. ** ** INVARIANTS: ** ** {F16603} A successful call to the ** [sqlite3_create_collation_v2(B,X,E,P,F,D)] interface ** registers function F as the comparison function used to ** implement collation X on [database connection] B for ** databases having encoding E. ** ** {F16604} SQLite understands the X parameter to ** [sqlite3_create_collation_v2(B,X,E,P,F,D)] as a zero-terminated ** UTF-8 string in which case is ignored for ASCII characters and ** is significant for non-ASCII characters. ** ** {F16606} Successive calls to [sqlite3_create_collation_v2(B,X,E,P,F,D)] ** with the same values for B, X, and E, override prior values ** of P, F, and D. ** ** {F16609} The destructor D in [sqlite3_create_collation_v2(B,X,E,P,F,D)] ** is not NULL then it is called with argument P when the ** collating function is dropped by SQLite. ** ** {F16612} A collating function is dropped when it is overloaded. ** ** {F16615} A collating function is dropped when the database connection ** is closed using [sqlite3_close()]. ** ** {F16618} The pointer P in [sqlite3_create_collation_v2(B,X,E,P,F,D)] ** is passed through as the first parameter to the comparison ** function F for all subsequent invocations of F. ** ** {F16621} A call to [sqlite3_create_collation(B,X,E,P,F)] is exactly ** the same as a call to [sqlite3_create_collation_v2()] with ** the same parameters and a NULL destructor. ** ** {F16624} Following a [sqlite3_create_collation_v2(B,X,E,P,F,D)], ** SQLite uses the comparison function F for all text comparison ** operations on [database connection] B on text values that ** use the collating sequence name X. ** ** {F16627} The [sqlite3_create_collation16(B,X,E,P,F)] works the same ** as [sqlite3_create_collation(B,X,E,P,F)] except that the ** collation name X is understood as UTF-16 in native byte order ** instead of UTF-8. ** ** {F16630} When multiple comparison functions are available for the same ** collating sequence, SQLite chooses the one whose text encoding ** requires the least amount of conversion from the default ** text encoding of the database. */ SQLITE_API int sqlite3_create_collation( sqlite3*, const char *zName, int eTextRep, void*, int(*xCompare)(void*,int,const void*,int,const void*) ); SQLITE_API int sqlite3_create_collation_v2( sqlite3*, const char *zName, int eTextRep, void*, int(*xCompare)(void*,int,const void*,int,const void*), void(*xDestroy)(void*) ); SQLITE_API int sqlite3_create_collation16( sqlite3*, const char *zName, int eTextRep, void*, int(*xCompare)(void*,int,const void*,int,const void*) ); /* ** CAPI3REF: Collation Needed Callbacks {F16700} ** ** To avoid having to register all collation sequences before a database ** can be used, a single callback function may be registered with the ** database handle to be called whenever an undefined collation sequence is ** required. ** ** If the function is registered using the sqlite3_collation_needed() API, ** then it is passed the names of undefined collation sequences as strings ** encoded in UTF-8. {F16703} If sqlite3_collation_needed16() is used, the names ** are passed as UTF-16 in machine native byte order. A call to either ** function replaces any existing callback. ** ** When the callback is invoked, the first argument passed is a copy ** of the second argument to sqlite3_collation_needed() or ** sqlite3_collation_needed16(). The second argument is the database ** handle. The third argument is one of [SQLITE_UTF8], ** [SQLITE_UTF16BE], or [SQLITE_UTF16LE], indicating the most ** desirable form of the collation sequence function required. ** The fourth parameter is the name of the ** required collation sequence. ** ** The callback function should register the desired collation using ** [sqlite3_create_collation()], [sqlite3_create_collation16()], or ** [sqlite3_create_collation_v2()]. ** ** INVARIANTS: ** ** {F16702} A successful call to [sqlite3_collation_needed(D,P,F)] ** or [sqlite3_collation_needed16(D,P,F)] causes ** the [database connection] D to invoke callback F with first ** parameter P whenever it needs a comparison function for a ** collating sequence that it does not know about. ** ** {F16704} Each successful call to [sqlite3_collation_needed()] or ** [sqlite3_collation_needed16()] overrides the callback registered ** on the same [database connection] by prior calls to either ** interface. ** ** {F16706} The name of the requested collating function passed in the ** 4th parameter to the callback is in UTF-8 if the callback ** was registered using [sqlite3_collation_needed()] and ** is in UTF-16 native byte order if the callback was ** registered using [sqlite3_collation_needed16()]. ** ** */ SQLITE_API int sqlite3_collation_needed( sqlite3*, void*, void(*)(void*,sqlite3*,int eTextRep,const char*) ); SQLITE_API int sqlite3_collation_needed16( sqlite3*, void*, void(*)(void*,sqlite3*,int eTextRep,const void*) ); /* ** Specify the key for an encrypted database. This routine should be ** called right after sqlite3_open(). ** ** The code to implement this API is not available in the public release ** of SQLite. */ SQLITE_API int sqlite3_key( sqlite3 *db, /* Database to be rekeyed */ const void *pKey, int nKey /* The key */ ); /* ** Change the key on an open database. If the current database is not ** encrypted, this routine will encrypt it. If pNew==0 or nNew==0, the ** database is decrypted. ** ** The code to implement this API is not available in the public release ** of SQLite. */ SQLITE_API int sqlite3_rekey( sqlite3 *db, /* Database to be rekeyed */ const void *pKey, int nKey /* The new key */ ); /* ** CAPI3REF: Suspend Execution For A Short Time {F10530} ** ** The sqlite3_sleep() function ** causes the current thread to suspend execution ** for at least a number of milliseconds specified in its parameter. ** ** If the operating system does not support sleep requests with ** millisecond time resolution, then the time will be rounded up to ** the nearest second. The number of milliseconds of sleep actually ** requested from the operating system is returned. ** ** SQLite implements this interface by calling the xSleep() ** method of the default [sqlite3_vfs] object. ** ** INVARIANTS: ** ** {F10533} The [sqlite3_sleep(M)] interface invokes the xSleep ** method of the default [sqlite3_vfs|VFS] in order to ** suspend execution of the current thread for at least ** M milliseconds. ** ** {F10536} The [sqlite3_sleep(M)] interface returns the number of ** milliseconds of sleep actually requested of the operating ** system, which might be larger than the parameter M. */ SQLITE_API int sqlite3_sleep(int); /* ** CAPI3REF: Name Of The Folder Holding Temporary Files {F10310} ** ** If this global variable is made to point to a string which is ** the name of a folder (a.ka. directory), then all temporary files ** created by SQLite will be placed in that directory. If this variable ** is NULL pointer, then SQLite does a search for an appropriate temporary ** file directory. ** ** It is not safe to modify this variable once a database connection ** has been opened. It is intended that this variable be set once ** as part of process initialization and before any SQLite interface ** routines have been call and remain unchanged thereafter. */ SQLITE_API char *sqlite3_temp_directory; /* ** CAPI3REF: Test To See If The Database Is In Auto-Commit Mode {F12930} ** ** The sqlite3_get_autocommit() interfaces returns non-zero or ** zero if the given database connection is or is not in autocommit mode, ** respectively. Autocommit mode is on ** by default. Autocommit mode is disabled by a [BEGIN] statement. ** Autocommit mode is reenabled by a [COMMIT] or [ROLLBACK]. ** ** If certain kinds of errors occur on a statement within a multi-statement ** transactions (errors including [SQLITE_FULL], [SQLITE_IOERR], ** [SQLITE_NOMEM], [SQLITE_BUSY], and [SQLITE_INTERRUPT]) then the ** transaction might be rolled back automatically. The only way to ** find out if SQLite automatically rolled back the transaction after ** an error is to use this function. ** ** INVARIANTS: ** ** {F12931} The [sqlite3_get_autocommit(D)] interface returns non-zero or ** zero if the [database connection] D is or is not in autocommit ** mode, respectively. ** ** {F12932} Autocommit mode is on by default. ** ** {F12933} Autocommit mode is disabled by a successful [BEGIN] statement. ** ** {F12934} Autocommit mode is enabled by a successful [COMMIT] or [ROLLBACK] ** statement. ** ** ** LIMITATIONS: *** ** {U12936} If another thread changes the autocommit status of the database ** connection while this routine is running, then the return value ** is undefined. */ SQLITE_API int sqlite3_get_autocommit(sqlite3*); /* ** CAPI3REF: Find The Database Handle Of A Prepared Statement {F13120} ** ** The sqlite3_db_handle interface ** returns the [sqlite3*] database handle to which a ** [prepared statement] belongs. ** The database handle returned by sqlite3_db_handle ** is the same database handle that was ** the first argument to the [sqlite3_prepare_v2()] or its variants ** that was used to create the statement in the first place. ** ** INVARIANTS: ** ** {F13123} The [sqlite3_db_handle(S)] interface returns a pointer ** to the [database connection] associated with ** [prepared statement] S. */ SQLITE_API sqlite3 *sqlite3_db_handle(sqlite3_stmt*); /* ** CAPI3REF: Commit And Rollback Notification Callbacks {F12950} ** ** The sqlite3_commit_hook() interface registers a callback ** function to be invoked whenever a transaction is committed. ** Any callback set by a previous call to sqlite3_commit_hook() ** for the same database connection is overridden. ** The sqlite3_rollback_hook() interface registers a callback ** function to be invoked whenever a transaction is committed. ** Any callback set by a previous call to sqlite3_commit_hook() ** for the same database connection is overridden. ** The pArg argument is passed through ** to the callback. If the callback on a commit hook function ** returns non-zero, then the commit is converted into a rollback. ** ** If another function was previously registered, its ** pArg value is returned. Otherwise NULL is returned. ** ** Registering a NULL function disables the callback. ** ** For the purposes of this API, a transaction is said to have been ** rolled back if an explicit "ROLLBACK" statement is executed, or ** an error or constraint causes an implicit rollback to occur. ** The rollback callback is not invoked if a transaction is ** automatically rolled back because the database connection is closed. ** The rollback callback is not invoked if a transaction is ** rolled back because a commit callback returned non-zero. ** Check on this ** ** These are experimental interfaces and are subject to change. ** ** INVARIANTS: ** ** {F12951} The [sqlite3_commit_hook(D,F,P)] interface registers the ** callback function F to be invoked with argument P whenever ** a transaction commits on [database connection] D. ** ** {F12952} The [sqlite3_commit_hook(D,F,P)] interface returns the P ** argument from the previous call with the same ** [database connection ] D , or NULL on the first call ** for a particular [database connection] D. ** ** {F12953} Each call to [sqlite3_commit_hook()] overwrites the callback ** registered by prior calls. ** ** {F12954} If the F argument to [sqlite3_commit_hook(D,F,P)] is NULL ** then the commit hook callback is cancelled and no callback ** is invoked when a transaction commits. ** ** {F12955} If the commit callback returns non-zero then the commit is ** converted into a rollback. ** ** {F12961} The [sqlite3_rollback_hook(D,F,P)] interface registers the ** callback function F to be invoked with argument P whenever ** a transaction rolls back on [database connection] D. ** ** {F12962} The [sqlite3_rollback_hook(D,F,P)] interface returns the P ** argument from the previous call with the same ** [database connection ] D , or NULL on the first call ** for a particular [database connection] D. ** ** {F12963} Each call to [sqlite3_rollback_hook()] overwrites the callback ** registered by prior calls. ** ** {F12964} If the F argument to [sqlite3_rollback_hook(D,F,P)] is NULL ** then the rollback hook callback is cancelled and no callback ** is invoked when a transaction rolls back. */ SQLITE_API void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*); SQLITE_API void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*); /* ** CAPI3REF: Data Change Notification Callbacks {F12970} ** ** The sqlite3_update_hook() interface ** registers a callback function with the database connection identified by the ** first argument to be invoked whenever a row is updated, inserted or deleted. ** Any callback set by a previous call to this function for the same ** database connection is overridden. ** ** The second argument is a pointer to the function to invoke when a ** row is updated, inserted or deleted. ** The first argument to the callback is ** a copy of the third argument to sqlite3_update_hook(). ** The second callback ** argument is one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE], ** depending on the operation that caused the callback to be invoked. ** The third and ** fourth arguments to the callback contain pointers to the database and ** table name containing the affected row. ** The final callback parameter is ** the rowid of the row. ** In the case of an update, this is the rowid after ** the update takes place. ** ** The update hook is not invoked when internal system tables are ** modified (i.e. sqlite_master and sqlite_sequence). ** ** If another function was previously registered, its pArg value ** is returned. Otherwise NULL is returned. ** ** INVARIANTS: ** ** {F12971} The [sqlite3_update_hook(D,F,P)] interface causes callback ** function F to be invoked with first parameter P whenever ** a table row is modified, inserted, or deleted on ** [database connection] D. ** ** {F12973} The [sqlite3_update_hook(D,F,P)] interface returns the value ** of P for the previous call on the same [database connection] D, ** or NULL for the first call. ** ** {F12975} If the update hook callback F in [sqlite3_update_hook(D,F,P)] ** is NULL then the no update callbacks are made. ** ** {F12977} Each call to [sqlite3_update_hook(D,F,P)] overrides prior calls ** to the same interface on the same [database connection] D. ** ** {F12979} The update hook callback is not invoked when internal system ** tables such as sqlite_master and sqlite_sequence are modified. ** ** {F12981} The second parameter to the update callback ** is one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE], ** depending on the operation that caused the callback to be invoked. ** ** {F12983} The third and fourth arguments to the callback contain pointers ** to zero-terminated UTF-8 strings which are the names of the ** database and table that is being updated. ** {F12985} The final callback parameter is the rowid of the row after ** the change occurs. */ SQLITE_API void *sqlite3_update_hook( sqlite3*, void(*)(void *,int ,char const *,char const *,sqlite3_int64), void* ); /* ** CAPI3REF: Enable Or Disable Shared Pager Cache {F10330} ** ** This routine enables or disables the sharing of the database cache ** and schema data structures between connections to the same database. ** Sharing is enabled if the argument is true and disabled if the argument ** is false. ** ** Cache sharing is enabled and disabled ** for an entire process. {END} This is a change as of SQLite version 3.5.0. ** In prior versions of SQLite, sharing was ** enabled or disabled for each thread separately. ** ** The cache sharing mode set by this interface effects all subsequent ** calls to [sqlite3_open()], [sqlite3_open_v2()], and [sqlite3_open16()]. ** Existing database connections continue use the sharing mode ** that was in effect at the time they were opened. ** ** Virtual tables cannot be used with a shared cache. When shared ** cache is enabled, the [sqlite3_create_module()] API used to register ** virtual tables will always return an error. ** ** This routine returns [SQLITE_OK] if shared cache was ** enabled or disabled successfully. An [error code] ** is returned otherwise. ** ** Shared cache is disabled by default. But this might change in ** future releases of SQLite. Applications that care about shared ** cache setting should set it explicitly. ** ** INVARIANTS: ** ** {F10331} A successful invocation of [sqlite3_enable_shared_cache(B)] ** will enable or disable shared cache mode for any subsequently ** created [database connection] in the same process. ** ** {F10336} When shared cache is enabled, the [sqlite3_create_module()] ** interface will always return an error. ** ** {F10337} The [sqlite3_enable_shared_cache(B)] interface returns ** [SQLITE_OK] if shared cache was enabled or disabled successfully. ** ** {F10339} Shared cache is disabled by default. */ SQLITE_API int sqlite3_enable_shared_cache(int); /* ** CAPI3REF: Attempt To Free Heap Memory {F17340} ** ** The sqlite3_release_memory() interface attempts to ** free N bytes of heap memory by deallocating non-essential memory ** allocations held by the database labrary. {END} Memory used ** to cache database pages to improve performance is an example of ** non-essential memory. Sqlite3_release_memory() returns ** the number of bytes actually freed, which might be more or less ** than the amount requested. ** ** INVARIANTS: ** ** {F17341} The [sqlite3_release_memory(N)] interface attempts to ** free N bytes of heap memory by deallocating non-essential ** memory allocations held by the database labrary. ** ** {F16342} The [sqlite3_release_memory(N)] returns the number ** of bytes actually freed, which might be more or less ** than the amount requested. */ SQLITE_API int sqlite3_release_memory(int); /* ** CAPI3REF: Impose A Limit On Heap Size {F17350} ** ** The sqlite3_soft_heap_limit() interface ** places a "soft" limit on the amount of heap memory that may be allocated ** by SQLite. If an internal allocation is requested ** that would exceed the soft heap limit, [sqlite3_release_memory()] is ** invoked one or more times to free up some space before the allocation ** is made. ** ** The limit is called "soft", because if ** [sqlite3_release_memory()] cannot ** free sufficient memory to prevent the limit from being exceeded, ** the memory is allocated anyway and the current operation proceeds. ** ** A negative or zero value for N means that there is no soft heap limit and ** [sqlite3_release_memory()] will only be called when memory is exhausted. ** The default value for the soft heap limit is zero. ** ** SQLite makes a best effort to honor the soft heap limit. ** But if the soft heap limit cannot honored, execution will ** continue without error or notification. This is why the limit is ** called a "soft" limit. It is advisory only. ** ** Prior to SQLite version 3.5.0, this routine only constrained the memory ** allocated by a single thread - the same thread in which this routine ** runs. Beginning with SQLite version 3.5.0, the soft heap limit is ** applied to all threads. The value specified for the soft heap limit ** is an upper bound on the total memory allocation for all threads. In ** version 3.5.0 there is no mechanism for limiting the heap usage for ** individual threads. ** ** INVARIANTS: ** ** {F16351} The [sqlite3_soft_heap_limit(N)] interface places a soft limit ** of N bytes on the amount of heap memory that may be allocated ** using [sqlite3_malloc()] or [sqlite3_realloc()] at any point ** in time. ** ** {F16352} If a call to [sqlite3_malloc()] or [sqlite3_realloc()] would ** cause the total amount of allocated memory to exceed the ** soft heap limit, then [sqlite3_release_memory()] is invoked ** in an attempt to reduce the memory usage prior to proceeding ** with the memory allocation attempt. ** ** {F16353} Calls to [sqlite3_malloc()] or [sqlite3_realloc()] that trigger ** attempts to reduce memory usage through the soft heap limit ** mechanism continue even if the attempt to reduce memory ** usage is unsuccessful. ** ** {F16354} A negative or zero value for N in a call to ** [sqlite3_soft_heap_limit(N)] means that there is no soft ** heap limit and [sqlite3_release_memory()] will only be ** called when memory is completely exhausted. ** ** {F16355} The default value for the soft heap limit is zero. ** ** {F16358} Each call to [sqlite3_soft_heap_limit(N)] overrides the ** values set by all prior calls. */ SQLITE_API void sqlite3_soft_heap_limit(int); /* ** CAPI3REF: Extract Metadata About A Column Of A Table {F12850} ** ** This routine ** returns meta-data about a specific column of a specific database ** table accessible using the connection handle passed as the first function ** argument. ** ** The column is identified by the second, third and fourth parameters to ** this function. The second parameter is either the name of the database ** (i.e. "main", "temp" or an attached database) containing the specified ** table or NULL. If it is NULL, then all attached databases are searched ** for the table using the same algorithm as the database engine uses to ** resolve unqualified table references. ** ** The third and fourth parameters to this function are the table and column ** name of the desired column, respectively. Neither of these parameters ** may be NULL. ** ** Meta information is returned by writing to the memory locations passed as ** the 5th and subsequent parameters to this function. Any of these ** arguments may be NULL, in which case the corresponding element of meta ** information is ommitted. ** ** 
** Parameter     Output Type      Description
** -----------------------------------
**
**   5th         const char*      Data type
**   6th         const char*      Name of the default collation sequence 
**   7th         int              True if the column has a NOT NULL constraint
**   8th         int              True if the column is part of the PRIMARY KEY
**   9th         int              True if the column is AUTOINCREMENT
**
** ** ** The memory pointed to by the character pointers returned for the ** declaration type and collation sequence is valid only until the next ** call to any sqlite API function. ** ** If the specified table is actually a view, then an error is returned. ** ** If the specified column is "rowid", "oid" or "_rowid_" and an ** INTEGER PRIMARY KEY column has been explicitly declared, then the output ** parameters are set for the explicitly declared column. If there is no ** explicitly declared IPK column, then the output parameters are set as ** follows: ** ** 
**     data type: "INTEGER"
**     collation sequence: "BINARY"
**     not null: 0
**     primary key: 1
**     auto increment: 0
**
** ** This function may load one or more schemas from database files. If an ** error occurs during this process, or if the requested table or column ** cannot be found, an SQLITE error code is returned and an error message ** left in the database handle (to be retrieved using sqlite3_errmsg()). ** ** This API is only available if the library was compiled with the ** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined. */ SQLITE_API int sqlite3_table_column_metadata( sqlite3 *db, /* Connection handle */ const char *zDbName, /* Database name or NULL */ const char *zTableName, /* Table name */ const char *zColumnName, /* Column name */ char const **pzDataType, /* OUTPUT: Declared data type */ char const **pzCollSeq, /* OUTPUT: Collation sequence name */ int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */ int *pPrimaryKey, /* OUTPUT: True if column part of PK */ int *pAutoinc /* OUTPUT: True if column is auto-increment */ ); /* ** CAPI3REF: Load An Extension {F12600} ** ** {F12601} The sqlite3_load_extension() interface ** attempts to load an SQLite extension library contained in the file ** zFile. {F12602} The entry point is zProc. {F12603} zProc may be 0 ** in which case the name of the entry point defaults ** to "sqlite3_extension_init". ** ** {F12604} The sqlite3_load_extension() interface shall ** return [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong. ** ** {F12605} ** If an error occurs and pzErrMsg is not 0, then the ** sqlite3_load_extension() interface shall attempt to fill *pzErrMsg with ** error message text stored in memory obtained from [sqlite3_malloc()]. ** {END} The calling function should free this memory ** by calling [sqlite3_free()]. ** ** {F12606} ** Extension loading must be enabled using [sqlite3_enable_load_extension()] ** prior to calling this API or an error will be returned. */ SQLITE_API int sqlite3_load_extension( sqlite3 *db, /* Load the extension into this database connection */ const char *zFile, /* Name of the shared library containing extension */ const char *zProc, /* Entry point. Derived from zFile if 0 */ char **pzErrMsg /* Put error message here if not 0 */ ); /* ** CAPI3REF: Enable Or Disable Extension Loading {F12620} ** ** So as not to open security holes in older applications that are ** unprepared to deal with extension loading, and as a means of disabling ** extension loading while evaluating user-entered SQL, the following ** API is provided to turn the [sqlite3_load_extension()] mechanism on and ** off. {F12622} It is off by default. {END} See ticket #1863. ** ** {F12621} Call the sqlite3_enable_load_extension() routine ** with onoff==1 to turn extension loading on ** and call it with onoff==0 to turn it back off again. {END} */ SQLITE_API int sqlite3_enable_load_extension(sqlite3 *db, int onoff); /* ** CAPI3REF: Make Arrangements To Automatically Load An Extension {F12640} ** ** {F12641} This function ** registers an extension entry point that is automatically invoked ** whenever a new database connection is opened using ** [sqlite3_open()], [sqlite3_open16()], or [sqlite3_open_v2()]. {END} ** ** This API can be invoked at program startup in order to register ** one or more statically linked extensions that will be available ** to all new database connections. ** ** {F12642} Duplicate extensions are detected so calling this routine multiple ** times with the same extension is harmless. ** ** {F12643} This routine stores a pointer to the extension in an array ** that is obtained from sqlite_malloc(). {END} If you run a memory leak ** checker on your program and it reports a leak because of this ** array, then invoke [sqlite3_reset_auto_extension()] prior ** to shutdown to free the memory. ** ** {F12644} Automatic extensions apply across all threads. {END} ** ** This interface is experimental and is subject to change or ** removal in future releases of SQLite. */ SQLITE_API int sqlite3_auto_extension(void *xEntryPoint); /* ** CAPI3REF: Reset Automatic Extension Loading {F12660} ** ** {F12661} This function disables all previously registered ** automatic extensions. {END} This ** routine undoes the effect of all prior [sqlite3_auto_extension()] ** calls. ** ** {F12662} This call disabled automatic extensions in all threads. {END} ** ** This interface is experimental and is subject to change or ** removal in future releases of SQLite. */ SQLITE_API void sqlite3_reset_auto_extension(void); /* ****** EXPERIMENTAL - subject to change without notice ************** ** ** The interface to the virtual-table mechanism is currently considered ** to be experimental. The interface might change in incompatible ways. ** If this is a problem for you, do not use the interface at this time. ** ** When the virtual-table mechanism stablizes, we will declare the ** interface fixed, support it indefinitely, and remove this comment. */ /* ** Structures used by the virtual table interface */ typedef struct sqlite3_vtab sqlite3_vtab; typedef struct sqlite3_index_info sqlite3_index_info; typedef struct sqlite3_vtab_cursor sqlite3_vtab_cursor; typedef struct sqlite3_module sqlite3_module; /* ** CAPI3REF: Virtual Table Object {F18000} ** KEYWORDS: sqlite3_module ** ** A module is a class of virtual tables. Each module is defined ** by an instance of the following structure. This structure consists ** mostly of methods for the module. */ struct sqlite3_module { int iVersion; int (*xCreate)(sqlite3*, void *pAux, int argc, const char *const*argv, sqlite3_vtab **ppVTab, char**); int (*xConnect)(sqlite3*, void *pAux, int argc, const char *const*argv, sqlite3_vtab **ppVTab, char**); int (*xBestIndex)(sqlite3_vtab *pVTab, sqlite3_index_info*); int (*xDisconnect)(sqlite3_vtab *pVTab); int (*xDestroy)(sqlite3_vtab *pVTab); int (*xOpen)(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor); int (*xClose)(sqlite3_vtab_cursor*); int (*xFilter)(sqlite3_vtab_cursor*, int idxNum, const char *idxStr, int argc, sqlite3_value **argv); int (*xNext)(sqlite3_vtab_cursor*); int (*xEof)(sqlite3_vtab_cursor*); int (*xColumn)(sqlite3_vtab_cursor*, sqlite3_context*, int); int (*xRowid)(sqlite3_vtab_cursor*, sqlite3_int64 *pRowid); int (*xUpdate)(sqlite3_vtab *, int, sqlite3_value **, sqlite3_int64 *); int (*xBegin)(sqlite3_vtab *pVTab); int (*xSync)(sqlite3_vtab *pVTab); int (*xCommit)(sqlite3_vtab *pVTab); int (*xRollback)(sqlite3_vtab *pVTab); int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName, void (**pxFunc)(sqlite3_context*,int,sqlite3_value**), void **ppArg); int (*xRename)(sqlite3_vtab *pVtab, const char *zNew); }; /* ** CAPI3REF: Virtual Table Indexing Information {F18100} ** KEYWORDS: sqlite3_index_info ** ** The sqlite3_index_info structure and its substructures is used to ** pass information into and receive the reply from the xBestIndex ** method of an sqlite3_module. The fields under **Inputs** are the ** inputs to xBestIndex and are read-only. xBestIndex inserts its ** results into the **Outputs** fields. ** ** The aConstraint[] array records WHERE clause constraints of the ** form: ** ** column OP expr ** ** Where OP is =, <, <=, >, or >=. ** The particular operator is stored ** in aConstraint[].op. The index of the column is stored in ** aConstraint[].iColumn. aConstraint[].usable is TRUE if the ** expr on the right-hand side can be evaluated (and thus the constraint ** is usable) and false if it cannot. ** ** The optimizer automatically inverts terms of the form "expr OP column" ** and makes other simplifications to the WHERE clause in an attempt to ** get as many WHERE clause terms into the form shown above as possible. ** The aConstraint[] array only reports WHERE clause terms in the correct ** form that refer to the particular virtual table being queried. ** ** Information about the ORDER BY clause is stored in aOrderBy[]. ** Each term of aOrderBy records a column of the ORDER BY clause. ** ** The xBestIndex method must fill aConstraintUsage[] with information ** about what parameters to pass to xFilter. If argvIndex>0 then ** the right-hand side of the corresponding aConstraint[] is evaluated ** and becomes the argvIndex-th entry in argv. If aConstraintUsage[].omit ** is true, then the constraint is assumed to be fully handled by the ** virtual table and is not checked again by SQLite. ** ** The idxNum and idxPtr values are recorded and passed into xFilter. ** sqlite3_free() is used to free idxPtr if needToFreeIdxPtr is true. ** ** The orderByConsumed means that output from xFilter will occur in ** the correct order to satisfy the ORDER BY clause so that no separate ** sorting step is required. ** ** The estimatedCost value is an estimate of the cost of doing the ** particular lookup. A full scan of a table with N entries should have ** a cost of N. A binary search of a table of N entries should have a ** cost of approximately log(N). */ struct sqlite3_index_info { /* Inputs */ int nConstraint; /* Number of entries in aConstraint */ struct sqlite3_index_constraint { int iColumn; /* Column on left-hand side of constraint */ unsigned char op; /* Constraint operator */ unsigned char usable; /* True if this constraint is usable */ int iTermOffset; /* Used internally - xBestIndex should ignore */ } *aConstraint; /* Table of WHERE clause constraints */ int nOrderBy; /* Number of terms in the ORDER BY clause */ struct sqlite3_index_orderby { int iColumn; /* Column number */ unsigned char desc; /* True for DESC. False for ASC. */ } *aOrderBy; /* The ORDER BY clause */ /* Outputs */ struct sqlite3_index_constraint_usage { int argvIndex; /* if >0, constraint is part of argv to xFilter */ unsigned char omit; /* Do not code a test for this constraint */ } *aConstraintUsage; int idxNum; /* Number used to identify the index */ char *idxStr; /* String, possibly obtained from sqlite3_malloc */ int needToFreeIdxStr; /* Free idxStr using sqlite3_free() if true */ int orderByConsumed; /* True if output is already ordered */ double estimatedCost; /* Estimated cost of using this index */ }; #define SQLITE_INDEX_CONSTRAINT_EQ 2 #define SQLITE_INDEX_CONSTRAINT_GT 4 #define SQLITE_INDEX_CONSTRAINT_LE 8 #define SQLITE_INDEX_CONSTRAINT_LT 16 #define SQLITE_INDEX_CONSTRAINT_GE 32 #define SQLITE_INDEX_CONSTRAINT_MATCH 64 /* ** CAPI3REF: Register A Virtual Table Implementation {F18200} ** ** This routine is used to register a new module name with an SQLite ** connection. Module names must be registered before creating new ** virtual tables on the module, or before using preexisting virtual ** tables of the module. */ SQLITE_API int sqlite3_create_module( sqlite3 *db, /* SQLite connection to register module with */ const char *zName, /* Name of the module */ const sqlite3_module *, /* Methods for the module */ void * /* Client data for xCreate/xConnect */ ); /* ** CAPI3REF: Register A Virtual Table Implementation {F18210} ** ** This routine is identical to the sqlite3_create_module() method above, ** except that it allows a destructor function to be specified. It is ** even more experimental than the rest of the virtual tables API. */ SQLITE_API int sqlite3_create_module_v2( sqlite3 *db, /* SQLite connection to register module with */ const char *zName, /* Name of the module */ const sqlite3_module *, /* Methods for the module */ void *, /* Client data for xCreate/xConnect */ void(*xDestroy)(void*) /* Module destructor function */ ); /* ** CAPI3REF: Virtual Table Instance Object {F18010} ** KEYWORDS: sqlite3_vtab ** ** Every module implementation uses a subclass of the following structure ** to describe a particular instance of the module. Each subclass will ** be tailored to the specific needs of the module implementation. The ** purpose of this superclass is to define certain fields that are common ** to all module implementations. ** ** Virtual tables methods can set an error message by assigning a ** string obtained from sqlite3_mprintf() to zErrMsg. The method should ** take care that any prior string is freed by a call to sqlite3_free() ** prior to assigning a new string to zErrMsg. After the error message ** is delivered up to the client application, the string will be automatically ** freed by sqlite3_free() and the zErrMsg field will be zeroed. Note ** that sqlite3_mprintf() and sqlite3_free() are used on the zErrMsg field ** since virtual tables are commonly implemented in loadable extensions which ** do not have access to sqlite3MPrintf() or sqlite3Free(). */ struct sqlite3_vtab { const sqlite3_module *pModule; /* The module for this virtual table */ int nRef; /* Used internally */ char *zErrMsg; /* Error message from sqlite3_mprintf() */ /* Virtual table implementations will typically add additional fields */ }; /* ** CAPI3REF: Virtual Table Cursor Object {F18020} ** KEYWORDS: sqlite3_vtab_cursor ** ** Every module implementation uses a subclass of the following structure ** to describe cursors that point into the virtual table and are used ** to loop through the virtual table. Cursors are created using the ** xOpen method of the module. Each module implementation will define ** the content of a cursor structure to suit its own needs. ** ** This superclass exists in order to define fields of the cursor that ** are common to all implementations. */ struct sqlite3_vtab_cursor { sqlite3_vtab *pVtab; /* Virtual table of this cursor */ /* Virtual table implementations will typically add additional fields */ }; /* ** CAPI3REF: Declare The Schema Of A Virtual Table {F18280} ** ** The xCreate and xConnect methods of a module use the following API ** to declare the format (the names and datatypes of the columns) of ** the virtual tables they implement. */ SQLITE_API int sqlite3_declare_vtab(sqlite3*, const char *zCreateTable); /* ** CAPI3REF: Overload A Function For A Virtual Table {F18300} ** ** Virtual tables can provide alternative implementations of functions ** using the xFindFunction method. But global versions of those functions ** must exist in order to be overloaded. ** ** This API makes sure a global version of a function with a particular ** name and number of parameters exists. If no such function exists ** before this API is called, a new function is created. The implementation ** of the new function always causes an exception to be thrown. So ** the new function is not good for anything by itself. Its only ** purpose is to be a place-holder function that can be overloaded ** by virtual tables. ** ** This API should be considered part of the virtual table interface, ** which is experimental and subject to change. */ SQLITE_API int sqlite3_overload_function(sqlite3*, const char *zFuncName, int nArg); /* ** The interface to the virtual-table mechanism defined above (back up ** to a comment remarkably similar to this one) is currently considered ** to be experimental. The interface might change in incompatible ways. ** If this is a problem for you, do not use the interface at this time. ** ** When the virtual-table mechanism stabilizes, we will declare the ** interface fixed, support it indefinitely, and remove this comment. ** ****** EXPERIMENTAL - subject to change without notice ************** */ /* ** CAPI3REF: A Handle To An Open BLOB {F17800} ** ** An instance of this object represents an open BLOB on which ** incremental I/O can be preformed. ** Objects of this type are created by ** [sqlite3_blob_open()] and destroyed by [sqlite3_blob_close()]. ** The [sqlite3_blob_read()] and [sqlite3_blob_write()] interfaces ** can be used to read or write small subsections of the blob. ** The [sqlite3_blob_bytes()] interface returns the size of the ** blob in bytes. */ typedef struct sqlite3_blob sqlite3_blob; /* ** CAPI3REF: Open A BLOB For Incremental I/O {F17810} ** ** This interfaces opens a handle to the blob located ** in row iRow, column zColumn, table zTable in database zDb; ** in other words, the same blob that would be selected by: ** ** 
**     SELECT zColumn FROM zDb.zTable WHERE rowid = iRow;
**
{END} ** ** If the flags parameter is non-zero, the blob is opened for ** read and write access. If it is zero, the blob is opened for read ** access. ** ** Note that the database name is not the filename that contains ** the database but rather the symbolic name of the database that ** is assigned when the database is connected using [ATTACH]. ** For the main database file, the database name is "main". For ** TEMP tables, the database name is "temp". ** ** On success, [SQLITE_OK] is returned and the new ** [sqlite3_blob | blob handle] is written to *ppBlob. ** Otherwise an error code is returned and ** any value written to *ppBlob should not be used by the caller. ** This function sets the database-handle error code and message ** accessible via [sqlite3_errcode()] and [sqlite3_errmsg()]. ** ** INVARIANTS: ** ** {F17813} A successful invocation of the [sqlite3_blob_open(D,B,T,C,R,F,P)] ** interface opens an [sqlite3_blob] object P on the blob ** in column C of table T in database B on [database connection] D. ** ** {F17814} A successful invocation of [sqlite3_blob_open(D,...)] starts ** a new transaction on [database connection] D if that connection ** is not already in a transaction. ** ** {F17816} The [sqlite3_blob_open(D,B,T,C,R,F,P)] interface opens the blob ** for read and write access if and only if the F parameter ** is non-zero. ** ** {F17819} The [sqlite3_blob_open()] interface returns [SQLITE_OK] on ** success and an appropriate [error code] on failure. ** ** {F17821} If an error occurs during evaluation of [sqlite3_blob_open(D,...)] ** then subsequent calls to [sqlite3_errcode(D)], ** [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] will return ** information approprate for that error. */ SQLITE_API int sqlite3_blob_open( sqlite3*, const char *zDb, const char *zTable, const char *zColumn, sqlite3_int64 iRow, int flags, sqlite3_blob **ppBlob ); /* ** CAPI3REF: Close A BLOB Handle {F17830} ** ** Close an open [sqlite3_blob | blob handle]. ** ** Closing a BLOB shall cause the current transaction to commit ** if there are no other BLOBs, no pending prepared statements, and the ** database connection is in autocommit mode. ** If any writes were made to the BLOB, they might be held in cache ** until the close operation if they will fit. {END} ** Closing the BLOB often forces the changes ** out to disk and so if any I/O errors occur, they will likely occur ** at the time when the BLOB is closed. {F17833} Any errors that occur during ** closing are reported as a non-zero return value. ** ** The BLOB is closed unconditionally. Even if this routine returns ** an error code, the BLOB is still closed. ** ** INVARIANTS: ** ** {F17833} The [sqlite3_blob_close(P)] interface closes an ** [sqlite3_blob] object P previously opened using ** [sqlite3_blob_open()]. ** ** {F17836} Closing an [sqlite3_blob] object using ** [sqlite3_blob_close()] shall cause the current transaction to ** commit if there are no other open [sqlite3_blob] objects ** or [prepared statements] on the same [database connection] and ** the [database connection] is in ** [sqlite3_get_autocommit | autocommit mode]. ** ** {F17839} The [sqlite3_blob_close(P)] interfaces closes the ** [sqlite3_blob] object P unconditionally, even if ** [sqlite3_blob_close(P)] returns something other than [SQLITE_OK]. ** */ SQLITE_API int sqlite3_blob_close(sqlite3_blob *); /* ** CAPI3REF: Return The Size Of An Open BLOB {F17840} ** ** Return the size in bytes of the blob accessible via the open ** [sqlite3_blob] object in its only argument. ** ** INVARIANTS: ** ** {F17843} The [sqlite3_blob_bytes(P)] interface returns the size ** in bytes of the BLOB that the [sqlite3_blob] object P ** refers to. */ SQLITE_API int sqlite3_blob_bytes(sqlite3_blob *); /* ** CAPI3REF: Read Data From A BLOB Incrementally {F17850} ** ** This function is used to read data from an open ** [sqlite3_blob | blob-handle] into a caller supplied buffer. ** N bytes of data are copied into buffer ** Z from the open blob, starting at offset iOffset. ** ** If offset iOffset is less than N bytes from the end of the blob, ** [SQLITE_ERROR] is returned and no data is read. If N or iOffset is ** less than zero [SQLITE_ERROR] is returned and no data is read. ** ** On success, SQLITE_OK is returned. Otherwise, an ** [error code] or an [extended error code] is returned. ** ** INVARIANTS: ** ** {F17853} The [sqlite3_blob_read(P,Z,N,X)] interface reads N bytes ** beginning at offset X from ** the blob that [sqlite3_blob] object P refers to ** and writes those N bytes into buffer Z. ** ** {F17856} In [sqlite3_blob_read(P,Z,N,X)] if the size of the blob ** is less than N+X bytes, then the function returns [SQLITE_ERROR] ** and nothing is read from the blob. ** ** {F17859} In [sqlite3_blob_read(P,Z,N,X)] if X or N is less than zero ** then the function returns [SQLITE_ERROR] ** and nothing is read from the blob. ** ** {F17862} The [sqlite3_blob_read(P,Z,N,X)] interface returns [SQLITE_OK] ** if N bytes where successfully read into buffer Z. ** ** {F17865} If the requested read could not be completed, ** the [sqlite3_blob_read(P,Z,N,X)] interface returns an ** appropriate [error code] or [extended error code]. ** ** {F17868} If an error occurs during evaluation of [sqlite3_blob_read(P,...)] ** then subsequent calls to [sqlite3_errcode(D)], ** [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] will return ** information approprate for that error, where D is the ** database handle that was used to open blob handle P. */ SQLITE_API int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset); /* ** CAPI3REF: Write Data Into A BLOB Incrementally {F17870} ** ** This function is used to write data into an open ** [sqlite3_blob | blob-handle] from a user supplied buffer. ** n bytes of data are copied from the buffer ** pointed to by z into the open blob, starting at offset iOffset. ** ** If the [sqlite3_blob | blob-handle] passed as the first argument ** was not opened for writing (the flags parameter to [sqlite3_blob_open()] *** was zero), this function returns [SQLITE_READONLY]. ** ** This function may only modify the contents of the blob; it is ** not possible to increase the size of a blob using this API. ** If offset iOffset is less than n bytes from the end of the blob, ** [SQLITE_ERROR] is returned and no data is written. If n is ** less than zero [SQLITE_ERROR] is returned and no data is written. ** ** On success, SQLITE_OK is returned. Otherwise, an ** [error code] or an [extended error code] is returned. ** ** INVARIANTS: ** ** {F17873} The [sqlite3_blob_write(P,Z,N,X)] interface writes N bytes ** from buffer Z into ** the blob that [sqlite3_blob] object P refers to ** beginning at an offset of X into the blob. ** ** {F17875} The [sqlite3_blob_write(P,Z,N,X)] interface returns ** [SQLITE_READONLY] if the [sqlite3_blob] object P was ** [sqlite3_blob_open | opened] for reading only. ** ** {F17876} In [sqlite3_blob_write(P,Z,N,X)] if the size of the blob ** is less than N+X bytes, then the function returns [SQLITE_ERROR] ** and nothing is written into the blob. ** ** {F17879} In [sqlite3_blob_write(P,Z,N,X)] if X or N is less than zero ** then the function returns [SQLITE_ERROR] ** and nothing is written into the blob. ** ** {F17882} The [sqlite3_blob_write(P,Z,N,X)] interface returns [SQLITE_OK] ** if N bytes where successfully written into blob. ** ** {F17885} If the requested write could not be completed, ** the [sqlite3_blob_write(P,Z,N,X)] interface returns an ** appropriate [error code] or [extended error code]. ** ** {F17888} If an error occurs during evaluation of [sqlite3_blob_write(D,...)] ** then subsequent calls to [sqlite3_errcode(D)], ** [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] will return ** information approprate for that error. */ SQLITE_API int sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset); /* ** CAPI3REF: Virtual File System Objects {F11200} ** ** A virtual filesystem (VFS) is an [sqlite3_vfs] object ** that SQLite uses to interact ** with the underlying operating system. Most SQLite builds come with a ** single default VFS that is appropriate for the host computer. ** New VFSes can be registered and existing VFSes can be unregistered. ** The following interfaces are provided. ** ** The sqlite3_vfs_find() interface returns a pointer to ** a VFS given its name. Names are case sensitive. ** Names are zero-terminated UTF-8 strings. ** If there is no match, a NULL ** pointer is returned. If zVfsName is NULL then the default ** VFS is returned. ** ** New VFSes are registered with sqlite3_vfs_register(). ** Each new VFS becomes the default VFS if the makeDflt flag is set. ** The same VFS can be registered multiple times without injury. ** To make an existing VFS into the default VFS, register it again ** with the makeDflt flag set. If two different VFSes with the ** same name are registered, the behavior is undefined. If a ** VFS is registered with a name that is NULL or an empty string, ** then the behavior is undefined. ** ** Unregister a VFS with the sqlite3_vfs_unregister() interface. ** If the default VFS is unregistered, another VFS is chosen as ** the default. The choice for the new VFS is arbitrary. ** ** INVARIANTS: ** ** {F11203} The [sqlite3_vfs_find(N)] interface returns a pointer to the ** registered [sqlite3_vfs] object whose name exactly matches ** the zero-terminated UTF-8 string N, or it returns NULL if ** there is no match. ** ** {F11206} If the N parameter to [sqlite3_vfs_find(N)] is NULL then ** the function returns a pointer to the default [sqlite3_vfs] ** object if there is one, or NULL if there is no default ** [sqlite3_vfs] object. ** ** {F11209} The [sqlite3_vfs_register(P,F)] interface registers the ** well-formed [sqlite3_vfs] object P using the name given ** by the zName field of the object. ** ** {F11212} Using the [sqlite3_vfs_register(P,F)] interface to register ** the same [sqlite3_vfs] object multiple times is a harmless no-op. ** ** {F11215} The [sqlite3_vfs_register(P,F)] interface makes the ** the [sqlite3_vfs] object P the default [sqlite3_vfs] object ** if F is non-zero. ** ** {F11218} The [sqlite3_vfs_unregister(P)] interface unregisters the ** [sqlite3_vfs] object P so that it is no longer returned by ** subsequent calls to [sqlite3_vfs_find()]. */ SQLITE_API sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName); SQLITE_API int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt); SQLITE_API int sqlite3_vfs_unregister(sqlite3_vfs*); /* ** CAPI3REF: Mutexes {F17000} ** ** The SQLite core uses these routines for thread ** synchronization. Though they are intended for internal ** use by SQLite, code that links against SQLite is ** permitted to use any of these routines. ** ** The SQLite source code contains multiple implementations ** of these mutex routines. An appropriate implementation ** is selected automatically at compile-time. The following ** implementations are available in the SQLite core: ** **
    **
  • SQLITE_MUTEX_OS2 **
  • SQLITE_MUTEX_PTHREAD **
  • SQLITE_MUTEX_W32 **
  • SQLITE_MUTEX_NOOP **
** ** The SQLITE_MUTEX_NOOP implementation is a set of routines ** that does no real locking and is appropriate for use in ** a single-threaded application. The SQLITE_MUTEX_OS2, ** SQLITE_MUTEX_PTHREAD, and SQLITE_MUTEX_W32 implementations ** are appropriate for use on os/2, unix, and windows. ** ** If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor ** macro defined (with "-DSQLITE_MUTEX_APPDEF=1"), then no mutex ** implementation is included with the library. The ** mutex interface routines defined here become external ** references in the SQLite library for which implementations ** must be provided by the application. This facility allows an ** application that links against SQLite to provide its own mutex ** implementation without having to modify the SQLite core. ** ** {F17011} The sqlite3_mutex_alloc() routine allocates a new ** mutex and returns a pointer to it. {F17012} If it returns NULL ** that means that a mutex could not be allocated. {F17013} SQLite ** will unwind its stack and return an error. {F17014} The argument ** to sqlite3_mutex_alloc() is one of these integer constants: ** **
    **
  • SQLITE_MUTEX_FAST **
  • SQLITE_MUTEX_RECURSIVE **
  • SQLITE_MUTEX_STATIC_MASTER **
  • SQLITE_MUTEX_STATIC_MEM **
  • SQLITE_MUTEX_STATIC_MEM2 **
  • SQLITE_MUTEX_STATIC_PRNG **
  • SQLITE_MUTEX_STATIC_LRU **
  • SQLITE_MUTEX_STATIC_LRU2 **
{END} ** ** {F17015} The first two constants cause sqlite3_mutex_alloc() to create ** a new mutex. The new mutex is recursive when SQLITE_MUTEX_RECURSIVE ** is used but not necessarily so when SQLITE_MUTEX_FAST is used. {END} ** The mutex implementation does not need to make a distinction ** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does ** not want to. {F17016} But SQLite will only request a recursive mutex in ** cases where it really needs one. {END} If a faster non-recursive mutex ** implementation is available on the host platform, the mutex subsystem ** might return such a mutex in response to SQLITE_MUTEX_FAST. ** ** {F17017} The other allowed parameters to sqlite3_mutex_alloc() each return ** a pointer to a static preexisting mutex. {END} Four static mutexes are ** used by the current version of SQLite. Future versions of SQLite ** may add additional static mutexes. Static mutexes are for internal ** use by SQLite only. Applications that use SQLite mutexes should ** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or ** SQLITE_MUTEX_RECURSIVE. ** ** {F17018} Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST ** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc() ** returns a different mutex on every call. {F17034} But for the static ** mutex types, the same mutex is returned on every call that has ** the same type number. {END} ** ** {F17019} The sqlite3_mutex_free() routine deallocates a previously ** allocated dynamic mutex. {F17020} SQLite is careful to deallocate every ** dynamic mutex that it allocates. {U17021} The dynamic mutexes must not be in ** use when they are deallocated. {U17022} Attempting to deallocate a static ** mutex results in undefined behavior. {F17023} SQLite never deallocates ** a static mutex. {END} ** ** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt ** to enter a mutex. {F17024} If another thread is already within the mutex, ** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return ** SQLITE_BUSY. {F17025} The sqlite3_mutex_try() interface returns SQLITE_OK ** upon successful entry. {F17026} Mutexes created using ** SQLITE_MUTEX_RECURSIVE can be entered multiple times by the same thread. ** {F17027} In such cases the, ** mutex must be exited an equal number of times before another thread ** can enter. {U17028} If the same thread tries to enter any other ** kind of mutex more than once, the behavior is undefined. ** {F17029} SQLite will never exhibit ** such behavior in its own use of mutexes. {END} ** ** Some systems (ex: windows95) do not the operation implemented by ** sqlite3_mutex_try(). On those systems, sqlite3_mutex_try() will ** always return SQLITE_BUSY. {F17030} The SQLite core only ever uses ** sqlite3_mutex_try() as an optimization so this is acceptable behavior. {END} ** ** {F17031} The sqlite3_mutex_leave() routine exits a mutex that was ** previously entered by the same thread. {U17032} The behavior ** is undefined if the mutex is not currently entered by the ** calling thread or is not currently allocated. {F17033} SQLite will ** never do either. {END} ** ** See also: [sqlite3_mutex_held()] and [sqlite3_mutex_notheld()]. */ SQLITE_API sqlite3_mutex *sqlite3_mutex_alloc(int); SQLITE_API void sqlite3_mutex_free(sqlite3_mutex*); SQLITE_API void sqlite3_mutex_enter(sqlite3_mutex*); SQLITE_API int sqlite3_mutex_try(sqlite3_mutex*); SQLITE_API void sqlite3_mutex_leave(sqlite3_mutex*); /* ** CAPI3REF: Mutex Verifcation Routines {F17080} ** ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines ** are intended for use inside assert() statements. {F17081} The SQLite core ** never uses these routines except inside an assert() and applications ** are advised to follow the lead of the core. {F17082} The core only ** provides implementations for these routines when it is compiled ** with the SQLITE_DEBUG flag. {U17087} External mutex implementations ** are only required to provide these routines if SQLITE_DEBUG is ** defined and if NDEBUG is not defined. ** ** {F17083} These routines should return true if the mutex in their argument ** is held or not held, respectively, by the calling thread. {END} ** ** {X17084} The implementation is not required to provided versions of these ** routines that actually work. ** If the implementation does not provide working ** versions of these routines, it should at least provide stubs ** that always return true so that one does not get spurious ** assertion failures. {END} ** ** {F17085} If the argument to sqlite3_mutex_held() is a NULL pointer then ** the routine should return 1. {END} This seems counter-intuitive since ** clearly the mutex cannot be held if it does not exist. But the ** the reason the mutex does not exist is because the build is not ** using mutexes. And we do not want the assert() containing the ** call to sqlite3_mutex_held() to fail, so a non-zero return is ** the appropriate thing to do. {F17086} The sqlite3_mutex_notheld() ** interface should also return 1 when given a NULL pointer. */ SQLITE_API int sqlite3_mutex_held(sqlite3_mutex*); SQLITE_API int sqlite3_mutex_notheld(sqlite3_mutex*); /* ** CAPI3REF: Mutex Types {F17001} ** ** {F17002} The [sqlite3_mutex_alloc()] interface takes a single argument ** which is one of these integer constants. {END} */ #define SQLITE_MUTEX_FAST 0 #define SQLITE_MUTEX_RECURSIVE 1 #define SQLITE_MUTEX_STATIC_MASTER 2 #define SQLITE_MUTEX_STATIC_MEM 3 /* sqlite3_malloc() */ #define SQLITE_MUTEX_STATIC_MEM2 4 /* sqlite3_release_memory() */ #define SQLITE_MUTEX_STATIC_PRNG 5 /* sqlite3_random() */ #define SQLITE_MUTEX_STATIC_LRU 6 /* lru page list */ #define SQLITE_MUTEX_STATIC_LRU2 7 /* lru page list */ /* ** CAPI3REF: Low-Level Control Of Database Files {F11300} ** ** {F11301} The [sqlite3_file_control()] interface makes a direct call to the ** xFileControl method for the [sqlite3_io_methods] object associated ** with a particular database identified by the second argument. {F11302} The ** name of the database is the name assigned to the database by the ** ATTACH SQL command that opened the ** database. {F11303} To control the main database file, use the name "main" ** or a NULL pointer. {F11304} The third and fourth parameters to this routine ** are passed directly through to the second and third parameters of ** the xFileControl method. {F11305} The return value of the xFileControl ** method becomes the return value of this routine. ** ** {F11306} If the second parameter (zDbName) does not match the name of any ** open database file, then SQLITE_ERROR is returned. {F11307} This error ** code is not remembered and will not be recalled by [sqlite3_errcode()] ** or [sqlite3_errmsg()]. {U11308} The underlying xFileControl method might ** also return SQLITE_ERROR. {U11309} There is no way to distinguish between ** an incorrect zDbName and an SQLITE_ERROR return from the underlying ** xFileControl method. {END} ** ** See also: [SQLITE_FCNTL_LOCKSTATE] */ SQLITE_API int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*); /* ** CAPI3REF: Testing Interface {F11400} ** ** The sqlite3_test_control() interface is used to read out internal ** state of SQLite and to inject faults into SQLite for testing ** purposes. The first parameter a operation code that determines ** the number, meaning, and operation of all subsequent parameters. ** ** This interface is not for use by applications. It exists solely ** for verifying the correct operation of the SQLite library. Depending ** on how the SQLite library is compiled, this interface might not exist. ** ** The details of the operation codes, their meanings, the parameters ** they take, and what they do are all subject to change without notice. ** Unlike most of the SQLite API, this function is not guaranteed to ** operate consistently from one release to the next. */ SQLITE_API int sqlite3_test_control(int op, ...); /* ** CAPI3REF: Testing Interface Operation Codes {F11410} ** ** These constants are the valid operation code parameters used ** as the first argument to [sqlite3_test_control()]. ** ** These parameters and their meansing are subject to change ** without notice. These values are for testing purposes only. ** Applications should not use any of these parameters or the ** [sqlite3_test_control()] interface. */ #define SQLITE_TESTCTRL_FAULT_CONFIG 1 #define SQLITE_TESTCTRL_FAULT_FAILURES 2 #define SQLITE_TESTCTRL_FAULT_BENIGN_FAILURES 3 #define SQLITE_TESTCTRL_FAULT_PENDING 4 #define SQLITE_TESTCTRL_PRNG_SAVE 5 #define SQLITE_TESTCTRL_PRNG_RESTORE 6 #define SQLITE_TESTCTRL_PRNG_RESET 7 #define SQLITE_TESTCTRL_BITVEC_TEST 8 /* ** Undo the hack that converts floating point types to integer for ** builds on processors without floating point support. */ #ifdef SQLITE_OMIT_FLOATING_POINT # undef double #endif #if 0 } /* End of the 'extern "C"' block */ #endif #endif /************** End of sqlite3.h *********************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /************** Include hash.h in the middle of sqliteInt.h ******************/ /************** Begin file hash.h ********************************************/ /* ** 2001 September 22 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This is the header file for the generic hash-table implemenation ** used in SQLite. ** ** $Id: hash.h,v 1.11 2007/09/04 14:31:47 danielk1977 Exp $ */ #ifndef _SQLITE_HASH_H_ #define _SQLITE_HASH_H_ /* Forward declarations of structures. */ typedef struct Hash Hash; typedef struct HashElem HashElem; /* A complete hash table is an instance of the following structure. ** The internals of this structure are intended to be opaque -- client ** code should not attempt to access or modify the fields of this structure ** directly. Change this structure only by using the routines below. ** However, many of the "procedures" and "functions" for modifying and ** accessing this structure are really macros, so we can't really make ** this structure opaque. */ struct Hash { char keyClass; /* SQLITE_HASH_INT, _POINTER, _STRING, _BINARY */ char copyKey; /* True if copy of key made on insert */ int count; /* Number of entries in this table */ int htsize; /* Number of buckets in the hash table */ HashElem *first; /* The first element of the array */ struct _ht { /* the hash table */ int count; /* Number of entries with this hash */ HashElem *chain; /* Pointer to first entry with this hash */ } *ht; }; /* Each element in the hash table is an instance of the following ** structure. All elements are stored on a single doubly-linked list. ** ** Again, this structure is intended to be opaque, but it can't really ** be opaque because it is used by macros. */ struct HashElem { HashElem *next, *prev; /* Next and previous elements in the table */ void *data; /* Data associated with this element */ void *pKey; int nKey; /* Key associated with this element */ }; /* ** There are 4 different modes of operation for a hash table: ** ** SQLITE_HASH_INT nKey is used as the key and pKey is ignored. ** ** SQLITE_HASH_POINTER pKey is used as the key and nKey is ignored. ** ** SQLITE_HASH_STRING pKey points to a string that is nKey bytes long ** (including the null-terminator, if any). Case ** is ignored in comparisons. ** ** SQLITE_HASH_BINARY pKey points to binary data nKey bytes long. ** memcmp() is used to compare keys. ** ** A copy of the key is made for SQLITE_HASH_STRING and SQLITE_HASH_BINARY ** if the copyKey parameter to HashInit is 1. */ /* #define SQLITE_HASH_INT 1 // NOT USED */ /* #define SQLITE_HASH_POINTER 2 // NOT USED */ #define SQLITE_HASH_STRING 3 #define SQLITE_HASH_BINARY 4 /* ** Access routines. To delete, insert a NULL pointer. */ SQLITE_PRIVATE void sqlite3HashInit(Hash*, int keytype, int copyKey); SQLITE_PRIVATE void *sqlite3HashInsert(Hash*, const void *pKey, int nKey, void *pData); SQLITE_PRIVATE void *sqlite3HashFind(const Hash*, const void *pKey, int nKey); SQLITE_PRIVATE HashElem *sqlite3HashFindElem(const Hash*, const void *pKey, int nKey); SQLITE_PRIVATE void sqlite3HashClear(Hash*); /* ** Macros for looping over all elements of a hash table. The idiom is ** like this: ** ** Hash h; ** HashElem *p; ** ... ** for(p=sqliteHashFirst(&h); p; p=sqliteHashNext(p)){ ** SomeStructure *pData = sqliteHashData(p); ** // do something with pData ** } */ #define sqliteHashFirst(H) ((H)->first) #define sqliteHashNext(E) ((E)->next) #define sqliteHashData(E) ((E)->data) #define sqliteHashKey(E) ((E)->pKey) #define sqliteHashKeysize(E) ((E)->nKey) /* ** Number of entries in a hash table */ #define sqliteHashCount(H) ((H)->count) #endif /* _SQLITE_HASH_H_ */ /************** End of hash.h ************************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /************** Include parse.h in the middle of sqliteInt.h *****************/ /************** Begin file parse.h *******************************************/ #define TK_SEMI 1 #define TK_EXPLAIN 2 #define TK_QUERY 3 #define TK_PLAN 4 #define TK_BEGIN 5 #define TK_TRANSACTION 6 #define TK_DEFERRED 7 #define TK_IMMEDIATE 8 #define TK_EXCLUSIVE 9 #define TK_COMMIT 10 #define TK_END 11 #define TK_ROLLBACK 12 #define TK_CREATE 13 #define TK_TABLE 14 #define TK_IF 15 #define TK_NOT 16 #define TK_EXISTS 17 #define TK_TEMP 18 #define TK_LP 19 #define TK_RP 20 #define TK_AS 21 #define TK_COMMA 22 #define TK_ID 23 #define TK_ABORT 24 #define TK_AFTER 25 #define TK_ANALYZE 26 #define TK_ASC 27 #define TK_ATTACH 28 #define TK_BEFORE 29 #define TK_CASCADE 30 #define TK_CAST 31 #define TK_CONFLICT 32 #define TK_DATABASE 33 #define TK_DESC 34 #define TK_DETACH 35 #define TK_EACH 36 #define TK_FAIL 37 #define TK_FOR 38 #define TK_IGNORE 39 #define TK_INITIALLY 40 #define TK_INSTEAD 41 #define TK_LIKE_KW 42 #define TK_MATCH 43 #define TK_KEY 44 #define TK_OF 45 #define TK_OFFSET 46 #define TK_PRAGMA 47 #define TK_RAISE 48 #define TK_REPLACE 49 #define TK_RESTRICT 50 #define TK_ROW 51 #define TK_TRIGGER 52 #define TK_VACUUM 53 #define TK_VIEW 54 #define TK_VIRTUAL 55 #define TK_REINDEX 56 #define TK_RENAME 57 #define TK_CTIME_KW 58 #define TK_ANY 59 #define TK_OR 60 #define TK_AND 61 #define TK_IS 62 #define TK_BETWEEN 63 #define TK_IN 64 #define TK_ISNULL 65 #define TK_NOTNULL 66 #define TK_NE 67 #define TK_EQ 68 #define TK_GT 69 #define TK_LE 70 #define TK_LT 71 #define TK_GE 72 #define TK_ESCAPE 73 #define TK_BITAND 74 #define TK_BITOR 75 #define TK_LSHIFT 76 #define TK_RSHIFT 77 #define TK_PLUS 78 #define TK_MINUS 79 #define TK_STAR 80 #define TK_SLASH 81 #define TK_REM 82 #define TK_CONCAT 83 #define TK_COLLATE 84 #define TK_UMINUS 85 #define TK_UPLUS 86 #define TK_BITNOT 87 #define TK_STRING 88 #define TK_JOIN_KW 89 #define TK_CONSTRAINT 90 #define TK_DEFAULT 91 #define TK_NULL 92 #define TK_PRIMARY 93 #define TK_UNIQUE 94 #define TK_CHECK 95 #define TK_REFERENCES 96 #define TK_AUTOINCR 97 #define TK_ON 98 #define TK_DELETE 99 #define TK_UPDATE 100 #define TK_INSERT 101 #define TK_SET 102 #define TK_DEFERRABLE 103 #define TK_FOREIGN 104 #define TK_DROP 105 #define TK_UNION 106 #define TK_ALL 107 #define TK_EXCEPT 108 #define TK_INTERSECT 109 #define TK_SELECT 110 #define TK_DISTINCT 111 #define TK_DOT 112 #define TK_FROM 113 #define TK_JOIN 114 #define TK_USING 115 #define TK_ORDER 116 #define TK_BY 117 #define TK_GROUP 118 #define TK_HAVING 119 #define TK_LIMIT 120 #define TK_WHERE 121 #define TK_INTO 122 #define TK_VALUES 123 #define TK_INTEGER 124 #define TK_FLOAT 125 #define TK_BLOB 126 #define TK_REGISTER 127 #define TK_VARIABLE 128 #define TK_CASE 129 #define TK_WHEN 130 #define TK_THEN 131 #define TK_ELSE 132 #define TK_INDEX 133 #define TK_ALTER 134 #define TK_TO 135 #define TK_ADD 136 #define TK_COLUMNKW 137 #define TK_TO_TEXT 138 #define TK_TO_BLOB 139 #define TK_TO_NUMERIC 140 #define TK_TO_INT 141 #define TK_TO_REAL 142 #define TK_END_OF_FILE 143 #define TK_ILLEGAL 144 #define TK_SPACE 145 #define TK_UNCLOSED_STRING 146 #define TK_COMMENT 147 #define TK_FUNCTION 148 #define TK_COLUMN 149 #define TK_AGG_FUNCTION 150 #define TK_AGG_COLUMN 151 #define TK_CONST_FUNC 152 /************** End of parse.h ***********************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ #include #include #include #include #include /* ** If compiling for a processor that lacks floating point support, ** substitute integer for floating-point */ #ifdef SQLITE_OMIT_FLOATING_POINT # define double sqlite_int64 # define LONGDOUBLE_TYPE sqlite_int64 # ifndef SQLITE_BIG_DBL # define SQLITE_BIG_DBL (0x7fffffffffffffff) # endif # define SQLITE_OMIT_DATETIME_FUNCS 1 # define SQLITE_OMIT_TRACE 1 # undef SQLITE_MIXED_ENDIAN_64BIT_FLOAT #endif #ifndef SQLITE_BIG_DBL # define SQLITE_BIG_DBL (1e99) #endif /* ** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0 ** afterward. Having this macro allows us to cause the C compiler ** to omit code used by TEMP tables without messy #ifndef statements. */ #ifdef SQLITE_OMIT_TEMPDB #define OMIT_TEMPDB 1 #else #define OMIT_TEMPDB 0 #endif /* ** If the following macro is set to 1, then NULL values are considered ** distinct when determining whether or not two entries are the same ** in a UNIQUE index. This is the way PostgreSQL, Oracle, DB2, MySQL, ** OCELOT, and Firebird all work. The SQL92 spec explicitly says this ** is the way things are suppose to work. ** ** If the following macro is set to 0, the NULLs are indistinct for ** a UNIQUE index. In this mode, you can only have a single NULL entry ** for a column declared UNIQUE. This is the way Informix and SQL Server ** work. */ #define NULL_DISTINCT_FOR_UNIQUE 1 /* ** The "file format" number is an integer that is incremented whenever ** the VDBE-level file format changes. The following macros define the ** the default file format for new databases and the maximum file format ** that the library can read. */ #define SQLITE_MAX_FILE_FORMAT 4 #ifndef SQLITE_DEFAULT_FILE_FORMAT # define SQLITE_DEFAULT_FILE_FORMAT 1 #endif /* ** Provide a default value for TEMP_STORE in case it is not specified ** on the command-line */ #ifndef TEMP_STORE # define TEMP_STORE 1 #endif /* ** GCC does not define the offsetof() macro so we'll have to do it ** ourselves. */ #ifndef offsetof #define offsetof(STRUCTURE,FIELD) ((int)((char*)&((STRUCTURE*)0)->FIELD)) #endif /* ** Check to see if this machine uses EBCDIC. (Yes, believe it or ** not, there are still machines out there that use EBCDIC.) */ #if 'A' == '\301' # define SQLITE_EBCDIC 1 #else # define SQLITE_ASCII 1 #endif /* ** Integers of known sizes. These typedefs might change for architectures ** where the sizes very. Preprocessor macros are available so that the ** types can be conveniently redefined at compile-type. Like this: ** ** cc '-DUINTPTR_TYPE=long long int' ... */ #ifndef UINT32_TYPE # ifdef HAVE_UINT32_T # define UINT32_TYPE uint32_t # else # define UINT32_TYPE unsigned int # endif #endif #ifndef UINT16_TYPE # ifdef HAVE_UINT16_T # define UINT16_TYPE uint16_t # else # define UINT16_TYPE unsigned short int # endif #endif #ifndef INT16_TYPE # ifdef HAVE_INT16_T # define INT16_TYPE int16_t # else # define INT16_TYPE short int # endif #endif #ifndef UINT8_TYPE # ifdef HAVE_UINT8_T # define UINT8_TYPE uint8_t # else # define UINT8_TYPE unsigned char # endif #endif #ifndef INT8_TYPE # ifdef HAVE_INT8_T # define INT8_TYPE int8_t # else # define INT8_TYPE signed char # endif #endif #ifndef LONGDOUBLE_TYPE # define LONGDOUBLE_TYPE long double #endif typedef sqlite_int64 i64; /* 8-byte signed integer */ typedef sqlite_uint64 u64; /* 8-byte unsigned integer */ typedef UINT32_TYPE u32; /* 4-byte unsigned integer */ typedef UINT16_TYPE u16; /* 2-byte unsigned integer */ typedef INT16_TYPE i16; /* 2-byte signed integer */ typedef UINT8_TYPE u8; /* 1-byte unsigned integer */ typedef UINT8_TYPE i8; /* 1-byte signed integer */ /* ** Macros to determine whether the machine is big or little endian, ** evaluated at runtime. */ #ifdef SQLITE_AMALGAMATION SQLITE_PRIVATE const int sqlite3one; #else SQLITE_PRIVATE const int sqlite3one; #endif #if defined(i386) || defined(__i386__) || defined(_M_IX86) # define SQLITE_BIGENDIAN 0 # define SQLITE_LITTLEENDIAN 1 # define SQLITE_UTF16NATIVE SQLITE_UTF16LE #else # define SQLITE_BIGENDIAN (*(char *)(&sqlite3one)==0) # define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1) # define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE) #endif /* ** Constants for the largest and smallest possible 64-bit signed integers. ** These macros are designed to work correctly on both 32-bit and 64-bit ** compilers. */ #define LARGEST_INT64 (0xffffffff|(((i64)0x7fffffff)<<32)) #define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64) /* ** An instance of the following structure is used to store the busy-handler ** callback for a given sqlite handle. ** ** The sqlite.busyHandler member of the sqlite struct contains the busy ** callback for the database handle. Each pager opened via the sqlite ** handle is passed a pointer to sqlite.busyHandler. The busy-handler ** callback is currently invoked only from within pager.c. */ typedef struct BusyHandler BusyHandler; struct BusyHandler { int (*xFunc)(void *,int); /* The busy callback */ void *pArg; /* First arg to busy callback */ int nBusy; /* Incremented with each busy call */ }; /* ** Name of the master database table. The master database table ** is a special table that holds the names and attributes of all ** user tables and indices. */ #define MASTER_NAME "sqlite_master" #define TEMP_MASTER_NAME "sqlite_temp_master" /* ** The root-page of the master database table. */ #define MASTER_ROOT 1 /* ** The name of the schema table. */ #define SCHEMA_TABLE(x) ((!OMIT_TEMPDB)&&(x==1)?TEMP_MASTER_NAME:MASTER_NAME) /* ** A convenience macro that returns the number of elements in ** an array. */ #define ArraySize(X) (sizeof(X)/sizeof(X[0])) /* ** Forward references to structures */ typedef struct AggInfo AggInfo; typedef struct AuthContext AuthContext; typedef struct Bitvec Bitvec; typedef struct CollSeq CollSeq; typedef struct Column Column; typedef struct Db Db; typedef struct Schema Schema; typedef struct Expr Expr; typedef struct ExprList ExprList; typedef struct FKey FKey; typedef struct FuncDef FuncDef; typedef struct IdList IdList; typedef struct Index Index; typedef struct KeyClass KeyClass; typedef struct KeyInfo KeyInfo; typedef struct Module Module; typedef struct NameContext NameContext; typedef struct Parse Parse; typedef struct Select Select; typedef struct SrcList SrcList; typedef struct StrAccum StrAccum; typedef struct Table Table; typedef struct TableLock TableLock; typedef struct Token Token; typedef struct TriggerStack TriggerStack; typedef struct TriggerStep TriggerStep; typedef struct Trigger Trigger; typedef struct WhereInfo WhereInfo; typedef struct WhereLevel WhereLevel; /* ** Defer sourcing vdbe.h and btree.h until after the "u8" and ** "BusyHandler" typedefs. vdbe.h also requires a few of the opaque ** pointer types (i.e. FuncDef) defined above. */ /************** Include btree.h in the middle of sqliteInt.h *****************/ /************** Begin file btree.h *******************************************/ /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite B-Tree file ** subsystem. See comments in the source code for a detailed description ** of what each interface routine does. ** ** @(#) $Id: btree.h,v 1.98 2008/04/26 13:39:47 drh Exp $ */ #ifndef _BTREE_H_ #define _BTREE_H_ /* TODO: This definition is just included so other modules compile. It ** needs to be revisited. */ #define SQLITE_N_BTREE_META 10 /* ** If defined as non-zero, auto-vacuum is enabled by default. Otherwise ** it must be turned on for each database using "PRAGMA auto_vacuum = 1". */ #ifndef SQLITE_DEFAULT_AUTOVACUUM #define SQLITE_DEFAULT_AUTOVACUUM 0 #endif #define BTREE_AUTOVACUUM_NONE 0 /* Do not do auto-vacuum */ #define BTREE_AUTOVACUUM_FULL 1 /* Do full auto-vacuum */ #define BTREE_AUTOVACUUM_INCR 2 /* Incremental vacuum */ /* ** Forward declarations of structure */ typedef struct Btree Btree; typedef struct BtCursor BtCursor; typedef struct BtShared BtShared; typedef struct BtreeMutexArray BtreeMutexArray; /* ** This structure records all of the Btrees that need to hold ** a mutex before we enter sqlite3VdbeExec(). The Btrees are ** are placed in aBtree[] in order of aBtree[]->pBt. That way, ** we can always lock and unlock them all quickly. */ struct BtreeMutexArray { int nMutex; Btree *aBtree[SQLITE_MAX_ATTACHED+1]; }; SQLITE_PRIVATE int sqlite3BtreeOpen( const char *zFilename, /* Name of database file to open */ sqlite3 *db, /* Associated database connection */ Btree **, /* Return open Btree* here */ int flags, /* Flags */ int vfsFlags /* Flags passed through to VFS open */ ); /* The flags parameter to sqlite3BtreeOpen can be the bitwise or of the ** following values. ** ** NOTE: These values must match the corresponding PAGER_ values in ** pager.h. */ #define BTREE_OMIT_JOURNAL 1 /* Do not use journal. No argument */ #define BTREE_NO_READLOCK 2 /* Omit readlocks on readonly files */ #define BTREE_MEMORY 4 /* In-memory DB. No argument */ #define BTREE_READONLY 8 /* Open the database in read-only mode */ #define BTREE_READWRITE 16 /* Open for both reading and writing */ #define BTREE_CREATE 32 /* Create the database if it does not exist */ /* Additional values for the 4th argument of sqlite3BtreeOpen that ** are not associated with PAGER_ values. */ #define BTREE_PRIVATE 64 /* Never share with other connections */ SQLITE_PRIVATE int sqlite3BtreeClose(Btree*); SQLITE_PRIVATE int sqlite3BtreeSetCacheSize(Btree*,int); SQLITE_PRIVATE int sqlite3BtreeSetSafetyLevel(Btree*,int,int); SQLITE_PRIVATE int sqlite3BtreeSyncDisabled(Btree*); SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree*,int,int); SQLITE_PRIVATE int sqlite3BtreeGetPageSize(Btree*); SQLITE_PRIVATE int sqlite3BtreeMaxPageCount(Btree*,int); SQLITE_PRIVATE int sqlite3BtreeGetReserve(Btree*); SQLITE_PRIVATE int sqlite3BtreeSetAutoVacuum(Btree *, int); SQLITE_PRIVATE int sqlite3BtreeGetAutoVacuum(Btree *); SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree*,int); SQLITE_PRIVATE int sqlite3BtreeCommitPhaseOne(Btree*, const char *zMaster); SQLITE_PRIVATE int sqlite3BtreeCommitPhaseTwo(Btree*); SQLITE_PRIVATE int sqlite3BtreeCommit(Btree*); SQLITE_PRIVATE int sqlite3BtreeRollback(Btree*); SQLITE_PRIVATE int sqlite3BtreeBeginStmt(Btree*); SQLITE_PRIVATE int sqlite3BtreeCommitStmt(Btree*); SQLITE_PRIVATE int sqlite3BtreeRollbackStmt(Btree*); SQLITE_PRIVATE int sqlite3BtreeCreateTable(Btree*, int*, int flags); SQLITE_PRIVATE int sqlite3BtreeIsInTrans(Btree*); SQLITE_PRIVATE int sqlite3BtreeIsInStmt(Btree*); SQLITE_PRIVATE int sqlite3BtreeIsInReadTrans(Btree*); SQLITE_PRIVATE void *sqlite3BtreeSchema(Btree *, int, void(*)(void *)); SQLITE_PRIVATE int sqlite3BtreeSchemaLocked(Btree *); SQLITE_PRIVATE int sqlite3BtreeLockTable(Btree *, int, u8); SQLITE_PRIVATE const char *sqlite3BtreeGetFilename(Btree *); SQLITE_PRIVATE const char *sqlite3BtreeGetDirname(Btree *); SQLITE_PRIVATE const char *sqlite3BtreeGetJournalname(Btree *); SQLITE_PRIVATE int sqlite3BtreeCopyFile(Btree *, Btree *); SQLITE_PRIVATE int sqlite3BtreeIncrVacuum(Btree *); /* The flags parameter to sqlite3BtreeCreateTable can be the bitwise OR ** of the following flags: */ #define BTREE_INTKEY 1 /* Table has only 64-bit signed integer keys */ #define BTREE_ZERODATA 2 /* Table has keys only - no data */ #define BTREE_LEAFDATA 4 /* Data stored in leaves only. Implies INTKEY */ SQLITE_PRIVATE int sqlite3BtreeDropTable(Btree*, int, int*); SQLITE_PRIVATE int sqlite3BtreeClearTable(Btree*, int); SQLITE_PRIVATE int sqlite3BtreeGetMeta(Btree*, int idx, u32 *pValue); SQLITE_PRIVATE int sqlite3BtreeUpdateMeta(Btree*, int idx, u32 value); SQLITE_PRIVATE void sqlite3BtreeTripAllCursors(Btree*, int); struct UnpackedRecord; /* Forward declaration. Definition in vdbeaux.c. */ SQLITE_PRIVATE int sqlite3BtreeCursor( Btree*, /* BTree containing table to open */ int iTable, /* Index of root page */ int wrFlag, /* 1 for writing. 0 for read-only */ struct KeyInfo*, /* First argument to compare function */ BtCursor *pCursor /* Space to write cursor structure */ ); SQLITE_PRIVATE int sqlite3BtreeCursorSize(void); SQLITE_PRIVATE int sqlite3BtreeCloseCursor(BtCursor*); SQLITE_PRIVATE int sqlite3BtreeMoveto( BtCursor*, const void *pKey, struct UnpackedRecord *pUnKey, i64 nKey, int bias, int *pRes ); SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor*); SQLITE_PRIVATE int sqlite3BtreeInsert(BtCursor*, const void *pKey, i64 nKey, const void *pData, int nData, int nZero, int bias); SQLITE_PRIVATE int sqlite3BtreeFirst(BtCursor*, int *pRes); SQLITE_PRIVATE int sqlite3BtreeLast(BtCursor*, int *pRes); SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor*, int *pRes); SQLITE_PRIVATE int sqlite3BtreeEof(BtCursor*); SQLITE_PRIVATE int sqlite3BtreeFlags(BtCursor*); SQLITE_PRIVATE int sqlite3BtreePrevious(BtCursor*, int *pRes); SQLITE_PRIVATE int sqlite3BtreeKeySize(BtCursor*, i64 *pSize); SQLITE_PRIVATE int sqlite3BtreeKey(BtCursor*, u32 offset, u32 amt, void*); SQLITE_PRIVATE sqlite3 *sqlite3BtreeCursorDb(const BtCursor*); SQLITE_PRIVATE const void *sqlite3BtreeKeyFetch(BtCursor*, int *pAmt); SQLITE_PRIVATE const void *sqlite3BtreeDataFetch(BtCursor*, int *pAmt); SQLITE_PRIVATE int sqlite3BtreeDataSize(BtCursor*, u32 *pSize); SQLITE_PRIVATE int sqlite3BtreeData(BtCursor*, u32 offset, u32 amt, void*); SQLITE_PRIVATE char *sqlite3BtreeIntegrityCheck(Btree*, int *aRoot, int nRoot, int, int*); SQLITE_PRIVATE struct Pager *sqlite3BtreePager(Btree*); SQLITE_PRIVATE int sqlite3BtreePutData(BtCursor*, u32 offset, u32 amt, void*); SQLITE_PRIVATE void sqlite3BtreeCacheOverflow(BtCursor *); #ifdef SQLITE_TEST SQLITE_PRIVATE int sqlite3BtreeCursorInfo(BtCursor*, int*, int); SQLITE_PRIVATE void sqlite3BtreeCursorList(Btree*); SQLITE_PRIVATE int sqlite3BtreePageDump(Btree*, int, int recursive); #endif /* ** If we are not using shared cache, then there is no need to ** use mutexes to access the BtShared structures. So make the ** Enter and Leave procedures no-ops. */ #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE SQLITE_PRIVATE void sqlite3BtreeEnter(Btree*); SQLITE_PRIVATE void sqlite3BtreeLeave(Btree*); SQLITE_PRIVATE int sqlite3BtreeHoldsMutex(Btree*); SQLITE_PRIVATE void sqlite3BtreeEnterCursor(BtCursor*); SQLITE_PRIVATE void sqlite3BtreeLeaveCursor(BtCursor*); SQLITE_PRIVATE void sqlite3BtreeEnterAll(sqlite3*); SQLITE_PRIVATE void sqlite3BtreeLeaveAll(sqlite3*); SQLITE_PRIVATE int sqlite3BtreeHoldsAllMutexes(sqlite3*); SQLITE_PRIVATE void sqlite3BtreeMutexArrayEnter(BtreeMutexArray*); SQLITE_PRIVATE void sqlite3BtreeMutexArrayLeave(BtreeMutexArray*); SQLITE_PRIVATE void sqlite3BtreeMutexArrayInsert(BtreeMutexArray*, Btree*); #else # define sqlite3BtreeEnter(X) # define sqlite3BtreeLeave(X) # define sqlite3BtreeHoldsMutex(X) 1 # define sqlite3BtreeEnterCursor(X) # define sqlite3BtreeLeaveCursor(X) # define sqlite3BtreeEnterAll(X) # define sqlite3BtreeLeaveAll(X) # define sqlite3BtreeHoldsAllMutexes(X) 1 # define sqlite3BtreeMutexArrayEnter(X) # define sqlite3BtreeMutexArrayLeave(X) # define sqlite3BtreeMutexArrayInsert(X,Y) #endif #endif /* _BTREE_H_ */ /************** End of btree.h ***********************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /************** Include vdbe.h in the middle of sqliteInt.h ******************/ /************** Begin file vdbe.h ********************************************/ /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** Header file for the Virtual DataBase Engine (VDBE) ** ** This header defines the interface to the virtual database engine ** or VDBE. The VDBE implements an abstract machine that runs a ** simple program to access and modify the underlying database. ** ** $Id: vdbe.h,v 1.131 2008/05/01 17:03:49 drh Exp $ */ #ifndef _SQLITE_VDBE_H_ #define _SQLITE_VDBE_H_ /* ** A single VDBE is an opaque structure named "Vdbe". Only routines ** in the source file sqliteVdbe.c are allowed to see the insides ** of this structure. */ typedef struct Vdbe Vdbe; /* ** The names of the following types declared in vdbeInt.h are required ** for the VdbeOp definition. */ typedef struct VdbeFunc VdbeFunc; typedef struct Mem Mem; typedef struct UnpackedRecord UnpackedRecord; /* ** A single instruction of the virtual machine has an opcode ** and as many as three operands. The instruction is recorded ** as an instance of the following structure: */ struct VdbeOp { u8 opcode; /* What operation to perform */ signed char p4type; /* One of the P4_xxx constants for p4 */ u8 opflags; /* Not currently used */ u8 p5; /* Fifth parameter is an unsigned character */ int p1; /* First operand */ int p2; /* Second parameter (often the jump destination) */ int p3; /* The third parameter */ union { /* forth parameter */ int i; /* Integer value if p4type==P4_INT32 */ void *p; /* Generic pointer */ char *z; /* Pointer to data for string (char array) types */ i64 *pI64; /* Used when p4type is P4_INT64 */ double *pReal; /* Used when p4type is P4_REAL */ FuncDef *pFunc; /* Used when p4type is P4_FUNCDEF */ VdbeFunc *pVdbeFunc; /* Used when p4type is P4_VDBEFUNC */ CollSeq *pColl; /* Used when p4type is P4_COLLSEQ */ Mem *pMem; /* Used when p4type is P4_MEM */ sqlite3_vtab *pVtab; /* Used when p4type is P4_VTAB */ KeyInfo *pKeyInfo; /* Used when p4type is P4_KEYINFO */ } p4; #ifdef SQLITE_DEBUG char *zComment; /* Comment to improve readability */ #endif #ifdef VDBE_PROFILE int cnt; /* Number of times this instruction was executed */ long long cycles; /* Total time spend executing this instruction */ #endif }; typedef struct VdbeOp VdbeOp; /* ** A smaller version of VdbeOp used for the VdbeAddOpList() function because ** it takes up less space. */ struct VdbeOpList { u8 opcode; /* What operation to perform */ signed char p1; /* First operand */ signed char p2; /* Second parameter (often the jump destination) */ signed char p3; /* Third parameter */ }; typedef struct VdbeOpList VdbeOpList; /* ** Allowed values of VdbeOp.p3type */ #define P4_NOTUSED 0 /* The P4 parameter is not used */ #define P4_DYNAMIC (-1) /* Pointer to a string obtained from sqliteMalloc() */ #define P4_STATIC (-2) /* Pointer to a static string */ #define P4_COLLSEQ (-4) /* P4 is a pointer to a CollSeq structure */ #define P4_FUNCDEF (-5) /* P4 is a pointer to a FuncDef structure */ #define P4_KEYINFO (-6) /* P4 is a pointer to a KeyInfo structure */ #define P4_VDBEFUNC (-7) /* P4 is a pointer to a VdbeFunc structure */ #define P4_MEM (-8) /* P4 is a pointer to a Mem* structure */ #define P4_TRANSIENT (-9) /* P4 is a pointer to a transient string */ #define P4_VTAB (-10) /* P4 is a pointer to an sqlite3_vtab structure */ #define P4_MPRINTF (-11) /* P4 is a string obtained from sqlite3_mprintf() */ #define P4_REAL (-12) /* P4 is a 64-bit floating point value */ #define P4_INT64 (-13) /* P4 is a 64-bit signed integer */ #define P4_INT32 (-14) /* P4 is a 32-bit signed integer */ /* When adding a P4 argument using P4_KEYINFO, a copy of the KeyInfo structure ** is made. That copy is freed when the Vdbe is finalized. But if the ** argument is P4_KEYINFO_HANDOFF, the passed in pointer is used. It still ** gets freed when the Vdbe is finalized so it still should be obtained ** from a single sqliteMalloc(). But no copy is made and the calling ** function should *not* try to free the KeyInfo. */ #define P4_KEYINFO_HANDOFF (-9) /* ** The Vdbe.aColName array contains 5n Mem structures, where n is the ** number of columns of data returned by the statement. */ #define COLNAME_NAME 0 #define COLNAME_DECLTYPE 1 #define COLNAME_DATABASE 2 #define COLNAME_TABLE 3 #define COLNAME_COLUMN 4 #ifdef SQLITE_ENABLE_COLUMN_METADATA # define COLNAME_N 5 /* Number of COLNAME_xxx symbols */ #else # ifdef SQLITE_OMIT_DECLTYPE # define COLNAME_N 1 /* Store only the name */ # else # define COLNAME_N 2 /* Store the name and decltype */ # endif #endif /* ** The following macro converts a relative address in the p2 field ** of a VdbeOp structure into a negative number so that ** sqlite3VdbeAddOpList() knows that the address is relative. Calling ** the macro again restores the address. */ #define ADDR(X) (-1-(X)) /* ** The makefile scans the vdbe.c source file and creates the "opcodes.h" ** header file that defines a number for each opcode used by the VDBE. */ /************** Include opcodes.h in the middle of vdbe.h ********************/ /************** Begin file opcodes.h *****************************************/ /* Automatically generated. Do not edit */ /* See the mkopcodeh.awk script for details */ #define OP_VNext 1 #define OP_Affinity 2 #define OP_Column 3 #define OP_SetCookie 4 #define OP_Real 125 /* same as TK_FLOAT */ #define OP_Sequence 5 #define OP_MoveGt 6 #define OP_Ge 72 /* same as TK_GE */ #define OP_RowKey 7 #define OP_SCopy 8 #define OP_Eq 68 /* same as TK_EQ */ #define OP_OpenWrite 9 #define OP_NotNull 66 /* same as TK_NOTNULL */ #define OP_If 10 #define OP_ToInt 141 /* same as TK_TO_INT */ #define OP_String8 88 /* same as TK_STRING */ #define OP_VRowid 11 #define OP_CollSeq 12 #define OP_OpenRead 13 #define OP_Expire 14 #define OP_AutoCommit 15 #define OP_Gt 69 /* same as TK_GT */ #define OP_IntegrityCk 17 #define OP_Sort 18 #define OP_Copy 19 #define OP_Trace 20 #define OP_Function 21 #define OP_IfNeg 22 #define OP_And 61 /* same as TK_AND */ #define OP_Subtract 79 /* same as TK_MINUS */ #define OP_Noop 23 #define OP_Return 24 #define OP_Remainder 82 /* same as TK_REM */ #define OP_NewRowid 25 #define OP_Multiply 80 /* same as TK_STAR */ #define OP_Variable 26 #define OP_String 27 #define OP_RealAffinity 28 #define OP_VRename 29 #define OP_ParseSchema 30 #define OP_VOpen 31 #define OP_Close 32 #define OP_CreateIndex 33 #define OP_IsUnique 34 #define OP_NotFound 35 #define OP_Int64 36 #define OP_MustBeInt 37 #define OP_Halt 38 #define OP_Rowid 39 #define OP_IdxLT 40 #define OP_AddImm 41 #define OP_Statement 42 #define OP_RowData 43 #define OP_MemMax 44 #define OP_Or 60 /* same as TK_OR */ #define OP_NotExists 45 #define OP_Gosub 46 #define OP_Divide 81 /* same as TK_SLASH */ #define OP_Integer 47 #define OP_ToNumeric 140 /* same as TK_TO_NUMERIC*/ #define OP_Prev 48 #define OP_Concat 83 /* same as TK_CONCAT */ #define OP_BitAnd 74 /* same as TK_BITAND */ #define OP_VColumn 49 #define OP_CreateTable 50 #define OP_Last 51 #define OP_IsNull 65 /* same as TK_ISNULL */ #define OP_IncrVacuum 52 #define OP_IdxRowid 53 #define OP_ShiftRight 77 /* same as TK_RSHIFT */ #define OP_ResetCount 54 #define OP_FifoWrite 55 #define OP_ContextPush 56 #define OP_DropTrigger 57 #define OP_DropIndex 58 #define OP_IdxGE 59 #define OP_IdxDelete 62 #define OP_Vacuum 63 #define OP_MoveLe 64 #define OP_IfNot 73 #define OP_DropTable 84 #define OP_MakeRecord 85 #define OP_ToBlob 139 /* same as TK_TO_BLOB */ #define OP_ResultRow 86 #define OP_Delete 89 #define OP_AggFinal 90 #define OP_ShiftLeft 76 /* same as TK_LSHIFT */ #define OP_Goto 91 #define OP_TableLock 92 #define OP_FifoRead 93 #define OP_Clear 94 #define OP_MoveLt 95 #define OP_Le 70 /* same as TK_LE */ #define OP_VerifyCookie 96 #define OP_AggStep 97 #define OP_ToText 138 /* same as TK_TO_TEXT */ #define OP_Not 16 /* same as TK_NOT */ #define OP_ToReal 142 /* same as TK_TO_REAL */ #define OP_SetNumColumns 98 #define OP_Transaction 99 #define OP_VFilter 100 #define OP_Ne 67 /* same as TK_NE */ #define OP_VDestroy 101 #define OP_ContextPop 102 #define OP_BitOr 75 /* same as TK_BITOR */ #define OP_Next 103 #define OP_IdxInsert 104 #define OP_Lt 71 /* same as TK_LT */ #define OP_Insert 105 #define OP_Destroy 106 #define OP_ReadCookie 107 #define OP_ForceInt 108 #define OP_LoadAnalysis 109 #define OP_Explain 110 #define OP_OpenPseudo 111 #define OP_OpenEphemeral 112 #define OP_Null 113 #define OP_Move 114 #define OP_Blob 115 #define OP_Add 78 /* same as TK_PLUS */ #define OP_Rewind 116 #define OP_MoveGe 117 #define OP_VBegin 118 #define OP_VUpdate 119 #define OP_IfZero 120 #define OP_BitNot 87 /* same as TK_BITNOT */ #define OP_VCreate 121 #define OP_Found 122 #define OP_IfPos 123 #define OP_NullRow 124 /* The following opcode values are never used */ #define OP_NotUsed_126 126 #define OP_NotUsed_127 127 #define OP_NotUsed_128 128 #define OP_NotUsed_129 129 #define OP_NotUsed_130 130 #define OP_NotUsed_131 131 #define OP_NotUsed_132 132 #define OP_NotUsed_133 133 #define OP_NotUsed_134 134 #define OP_NotUsed_135 135 #define OP_NotUsed_136 136 #define OP_NotUsed_137 137 /* Properties such as "out2" or "jump" that are specified in ** comments following the "case" for each opcode in the vdbe.c ** are encoded into bitvectors as follows: */ #define OPFLG_JUMP 0x0001 /* jump: P2 holds jmp target */ #define OPFLG_OUT2_PRERELEASE 0x0002 /* out2-prerelease: */ #define OPFLG_IN1 0x0004 /* in1: P1 is an input */ #define OPFLG_IN2 0x0008 /* in2: P2 is an input */ #define OPFLG_IN3 0x0010 /* in3: P3 is an input */ #define OPFLG_OUT3 0x0020 /* out3: P3 is an output */ #define OPFLG_INITIALIZER {\ /* 0 */ 0x00, 0x01, 0x00, 0x00, 0x10, 0x02, 0x11, 0x00,\ /* 8 */ 0x00, 0x00, 0x05, 0x02, 0x00, 0x00, 0x00, 0x00,\ /* 16 */ 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00,\ /* 24 */ 0x00, 0x02, 0x02, 0x02, 0x04, 0x00, 0x00, 0x00,\ /* 32 */ 0x00, 0x02, 0x11, 0x11, 0x02, 0x05, 0x00, 0x02,\ /* 40 */ 0x11, 0x04, 0x00, 0x00, 0x0c, 0x11, 0x01, 0x02,\ /* 48 */ 0x01, 0x00, 0x02, 0x01, 0x01, 0x02, 0x00, 0x04,\ /* 56 */ 0x00, 0x00, 0x00, 0x11, 0x2c, 0x2c, 0x00, 0x00,\ /* 64 */ 0x11, 0x05, 0x05, 0x15, 0x15, 0x15, 0x15, 0x15,\ /* 72 */ 0x15, 0x05, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,\ /* 80 */ 0x2c, 0x2c, 0x2c, 0x2c, 0x00, 0x00, 0x00, 0x04,\ /* 88 */ 0x02, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x11,\ /* 96 */ 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01,\ /* 104 */ 0x08, 0x00, 0x02, 0x02, 0x05, 0x00, 0x00, 0x00,\ /* 112 */ 0x00, 0x02, 0x00, 0x02, 0x01, 0x11, 0x00, 0x00,\ /* 120 */ 0x05, 0x00, 0x11, 0x05, 0x00, 0x02, 0x00, 0x00,\ /* 128 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\ /* 136 */ 0x00, 0x00, 0x04, 0x04, 0x04, 0x04, 0x04,} /************** End of opcodes.h *********************************************/ /************** Continuing where we left off in vdbe.h ***********************/ /* ** Prototypes for the VDBE interface. See comments on the implementation ** for a description of what each of these routines does. */ SQLITE_PRIVATE Vdbe *sqlite3VdbeCreate(sqlite3*); SQLITE_PRIVATE int sqlite3VdbeAddOp0(Vdbe*,int); SQLITE_PRIVATE int sqlite3VdbeAddOp1(Vdbe*,int,int); SQLITE_PRIVATE int sqlite3VdbeAddOp2(Vdbe*,int,int,int); SQLITE_PRIVATE int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int); SQLITE_PRIVATE int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int); SQLITE_PRIVATE int sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp); SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1); SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2); SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, int addr, int P3); SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u8 P5); SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr); SQLITE_PRIVATE void sqlite3VdbeChangeToNoop(Vdbe*, int addr, int N); SQLITE_PRIVATE void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N); SQLITE_PRIVATE void sqlite3VdbeUsesBtree(Vdbe*, int); SQLITE_PRIVATE VdbeOp *sqlite3VdbeGetOp(Vdbe*, int); SQLITE_PRIVATE int sqlite3VdbeMakeLabel(Vdbe*); SQLITE_PRIVATE void sqlite3VdbeDelete(Vdbe*); SQLITE_PRIVATE void sqlite3VdbeMakeReady(Vdbe*,int,int,int,int); SQLITE_PRIVATE int sqlite3VdbeFinalize(Vdbe*); SQLITE_PRIVATE void sqlite3VdbeResolveLabel(Vdbe*, int); SQLITE_PRIVATE int sqlite3VdbeCurrentAddr(Vdbe*); #ifdef SQLITE_DEBUG SQLITE_PRIVATE void sqlite3VdbeTrace(Vdbe*,FILE*); #endif SQLITE_PRIVATE void sqlite3VdbeResetStepResult(Vdbe*); SQLITE_PRIVATE int sqlite3VdbeReset(Vdbe*, int); SQLITE_PRIVATE void sqlite3VdbeSetNumCols(Vdbe*,int); SQLITE_PRIVATE int sqlite3VdbeSetColName(Vdbe*, int, int, const char *, int); SQLITE_PRIVATE void sqlite3VdbeCountChanges(Vdbe*); SQLITE_PRIVATE sqlite3 *sqlite3VdbeDb(Vdbe*); SQLITE_PRIVATE void sqlite3VdbeSetSql(Vdbe*, const char *z, int n); SQLITE_PRIVATE void sqlite3VdbeSwap(Vdbe*,Vdbe*); #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT SQLITE_PRIVATE int sqlite3VdbeReleaseMemory(int); #endif SQLITE_PRIVATE UnpackedRecord *sqlite3VdbeRecordUnpack(KeyInfo*,int,const void*,void*,int); SQLITE_PRIVATE void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord*); SQLITE_PRIVATE int sqlite3VdbeRecordCompare(int,const void*,UnpackedRecord*); #ifndef NDEBUG SQLITE_PRIVATE void sqlite3VdbeComment(Vdbe*, const char*, ...); # define VdbeComment(X) sqlite3VdbeComment X #else # define VdbeComment(X) #endif #endif /************** End of vdbe.h ************************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /************** Include pager.h in the middle of sqliteInt.h *****************/ /************** Begin file pager.h *******************************************/ /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite page cache ** subsystem. The page cache subsystem reads and writes a file a page ** at a time and provides a journal for rollback. ** ** @(#) $Id: pager.h,v 1.72 2008/05/01 17:03:49 drh Exp $ */ #ifndef _PAGER_H_ #define _PAGER_H_ /* ** The type used to represent a page number. The first page in a file ** is called page 1. 0 is used to represent "not a page". */ typedef unsigned int Pgno; /* ** Each open file is managed by a separate instance of the "Pager" structure. */ typedef struct Pager Pager; /* ** Handle type for pages. */ typedef struct PgHdr DbPage; /* ** Allowed values for the flags parameter to sqlite3PagerOpen(). ** ** NOTE: This values must match the corresponding BTREE_ values in btree.h. */ #define PAGER_OMIT_JOURNAL 0x0001 /* Do not use a rollback journal */ #define PAGER_NO_READLOCK 0x0002 /* Omit readlocks on readonly files */ /* ** Valid values for the second argument to sqlite3PagerLockingMode(). */ #define PAGER_LOCKINGMODE_QUERY -1 #define PAGER_LOCKINGMODE_NORMAL 0 #define PAGER_LOCKINGMODE_EXCLUSIVE 1 /* ** Valid values for the second argument to sqlite3PagerJournalMode(). */ #define PAGER_JOURNALMODE_QUERY -1 #define PAGER_JOURNALMODE_DELETE 0 /* Commit by deleting journal file */ #define PAGER_JOURNALMODE_PERSIST 1 /* Commit by zeroing journal header */ #define PAGER_JOURNALMODE_OFF 2 /* Journal omitted. */ /* ** See source code comments for a detailed description of the following ** routines: */ SQLITE_PRIVATE int sqlite3PagerOpen(sqlite3_vfs *, Pager **ppPager, const char*, int,int,int); SQLITE_PRIVATE void sqlite3PagerSetBusyhandler(Pager*, BusyHandler *pBusyHandler); SQLITE_PRIVATE void sqlite3PagerSetDestructor(Pager*, void(*)(DbPage*,int)); SQLITE_PRIVATE void sqlite3PagerSetReiniter(Pager*, void(*)(DbPage*,int)); SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager*, u16*); SQLITE_PRIVATE int sqlite3PagerMaxPageCount(Pager*, int); SQLITE_PRIVATE int sqlite3PagerReadFileheader(Pager*, int, unsigned char*); SQLITE_PRIVATE void sqlite3PagerSetCachesize(Pager*, int); SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager); SQLITE_PRIVATE int sqlite3PagerAcquire(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag); #define sqlite3PagerGet(A,B,C) sqlite3PagerAcquire(A,B,C,0) SQLITE_PRIVATE DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno); SQLITE_PRIVATE int sqlite3PagerRef(DbPage*); SQLITE_PRIVATE int sqlite3PagerUnref(DbPage*); SQLITE_PRIVATE int sqlite3PagerWrite(DbPage*); SQLITE_PRIVATE int sqlite3PagerPagecount(Pager*); SQLITE_PRIVATE int sqlite3PagerTruncate(Pager*,Pgno); SQLITE_PRIVATE int sqlite3PagerBegin(DbPage*, int exFlag); SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(Pager*,const char *zMaster, Pgno, int); SQLITE_PRIVATE int sqlite3PagerCommitPhaseTwo(Pager*); SQLITE_PRIVATE int sqlite3PagerRollback(Pager*); SQLITE_PRIVATE int sqlite3PagerIsreadonly(Pager*); SQLITE_PRIVATE int sqlite3PagerStmtBegin(Pager*); SQLITE_PRIVATE int sqlite3PagerStmtCommit(Pager*); SQLITE_PRIVATE int sqlite3PagerStmtRollback(Pager*); SQLITE_PRIVATE void sqlite3PagerDontRollback(DbPage*); SQLITE_PRIVATE void sqlite3PagerDontWrite(DbPage*); SQLITE_PRIVATE int sqlite3PagerRefcount(Pager*); SQLITE_PRIVATE void sqlite3PagerSetSafetyLevel(Pager*,int,int); SQLITE_PRIVATE const char *sqlite3PagerFilename(Pager*); SQLITE_PRIVATE const sqlite3_vfs *sqlite3PagerVfs(Pager*); SQLITE_PRIVATE sqlite3_file *sqlite3PagerFile(Pager*); SQLITE_PRIVATE const char *sqlite3PagerDirname(Pager*); SQLITE_PRIVATE const char *sqlite3PagerJournalname(Pager*); SQLITE_PRIVATE int sqlite3PagerNosync(Pager*); SQLITE_PRIVATE int sqlite3PagerMovepage(Pager*,DbPage*,Pgno); SQLITE_PRIVATE void *sqlite3PagerGetData(DbPage *); SQLITE_PRIVATE void *sqlite3PagerGetExtra(DbPage *); SQLITE_PRIVATE int sqlite3PagerLockingMode(Pager *, int); SQLITE_PRIVATE int sqlite3PagerJournalMode(Pager *, int); SQLITE_PRIVATE void *sqlite3PagerTempSpace(Pager*); SQLITE_PRIVATE int sqlite3PagerSync(Pager *pPager); #if defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) && !defined(SQLITE_OMIT_DISKIO) SQLITE_PRIVATE int sqlite3PagerReleaseMemory(int); #endif #ifdef SQLITE_HAS_CODEC SQLITE_PRIVATE void sqlite3PagerSetCodec(Pager*,void*(*)(void*,void*,Pgno,int),void*); #endif #if !defined(NDEBUG) || defined(SQLITE_TEST) SQLITE_PRIVATE Pgno sqlite3PagerPagenumber(DbPage*); SQLITE_PRIVATE int sqlite3PagerIswriteable(DbPage*); #endif #ifdef SQLITE_TEST SQLITE_PRIVATE int *sqlite3PagerStats(Pager*); SQLITE_PRIVATE void sqlite3PagerRefdump(Pager*); #endif #ifdef SQLITE_TEST void disable_simulated_io_errors(void); void enable_simulated_io_errors(void); #else # define disable_simulated_io_errors() # define enable_simulated_io_errors() #endif #endif /* _PAGER_H_ */ /************** End of pager.h ***********************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /************** Include os.h in the middle of sqliteInt.h ********************/ /************** Begin file os.h **********************************************/ /* ** 2001 September 16 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This header file (together with is companion C source-code file ** "os.c") attempt to abstract the underlying operating system so that ** the SQLite library will work on both POSIX and windows systems. ** ** This header file is #include-ed by sqliteInt.h and thus ends up ** being included by every source file. */ #ifndef _SQLITE_OS_H_ #define _SQLITE_OS_H_ /* ** Figure out if we are dealing with Unix, Windows, or some other ** operating system. After the following block of preprocess macros, ** all of OS_UNIX, OS_WIN, OS_OS2, and OS_OTHER will defined to either ** 1 or 0. One of the four will be 1. The other three will be 0. */ #if defined(OS_OTHER) # if OS_OTHER==1 # undef OS_UNIX # define OS_UNIX 0 # undef OS_WIN # define OS_WIN 0 # undef OS_OS2 # define OS_OS2 0 # else # undef OS_OTHER # endif #endif #if !defined(OS_UNIX) && !defined(OS_OTHER) # define OS_OTHER 0 # ifndef OS_WIN # if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) # define OS_WIN 1 # define OS_UNIX 0 # define OS_OS2 0 # elif defined(__EMX__) || defined(_OS2) || defined(OS2) || defined(_OS2_) || defined(__OS2__) # define OS_WIN 0 # define OS_UNIX 0 # define OS_OS2 1 # else # define OS_WIN 0 # define OS_UNIX 1 # define OS_OS2 0 # endif # else # define OS_UNIX 0 # define OS_OS2 0 # endif #else # ifndef OS_WIN # define OS_WIN 0 # endif #endif /* ** Define the maximum size of a temporary filename */ #if OS_WIN # include # define SQLITE_TEMPNAME_SIZE (MAX_PATH+50) #elif OS_OS2 # if (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ >= 3) && defined(OS2_HIGH_MEMORY) # include /* has to be included before os2.h for linking to work */ # endif # define INCL_DOSDATETIME # define INCL_DOSFILEMGR # define INCL_DOSERRORS # define INCL_DOSMISC # define INCL_DOSPROCESS # define INCL_DOSMODULEMGR # define INCL_DOSSEMAPHORES # include # include # define SQLITE_TEMPNAME_SIZE (CCHMAXPATHCOMP) #else # define SQLITE_TEMPNAME_SIZE 200 #endif /* If the SET_FULLSYNC macro is not defined above, then make it ** a no-op */ #ifndef SET_FULLSYNC # define SET_FULLSYNC(x,y) #endif /* ** The default size of a disk sector */ #ifndef SQLITE_DEFAULT_SECTOR_SIZE # define SQLITE_DEFAULT_SECTOR_SIZE 512 #endif /* ** Temporary files are named starting with this prefix followed by 16 random ** alphanumeric characters, and no file extension. They are stored in the ** OS's standard temporary file directory, and are deleted prior to exit. ** If sqlite is being embedded in another program, you may wish to change the ** prefix to reflect your program's name, so that if your program exits ** prematurely, old temporary files can be easily identified. This can be done ** using -DSQLITE_TEMP_FILE_PREFIX=myprefix_ on the compiler command line. ** ** 2006-10-31: The default prefix used to be "sqlite_". But then ** Mcafee started using SQLite in their anti-virus product and it ** started putting files with the "sqlite" name in the c:/temp folder. ** This annoyed many windows users. Those users would then do a ** Google search for "sqlite", find the telephone numbers of the ** developers and call to wake them up at night and complain. ** For this reason, the default name prefix is changed to be "sqlite" ** spelled backwards. So the temp files are still identified, but ** anybody smart enough to figure out the code is also likely smart ** enough to know that calling the developer will not help get rid ** of the file. */ #ifndef SQLITE_TEMP_FILE_PREFIX # define SQLITE_TEMP_FILE_PREFIX "etilqs_" #endif /* ** The following values may be passed as the second argument to ** sqlite3OsLock(). The various locks exhibit the following semantics: ** ** SHARED: Any number of processes may hold a SHARED lock simultaneously. ** RESERVED: A single process may hold a RESERVED lock on a file at ** any time. Other processes may hold and obtain new SHARED locks. ** PENDING: A single process may hold a PENDING lock on a file at ** any one time. Existing SHARED locks may persist, but no new ** SHARED locks may be obtained by other processes. ** EXCLUSIVE: An EXCLUSIVE lock precludes all other locks. ** ** PENDING_LOCK may not be passed directly to sqlite3OsLock(). Instead, a ** process that requests an EXCLUSIVE lock may actually obtain a PENDING ** lock. This can be upgraded to an EXCLUSIVE lock by a subsequent call to ** sqlite3OsLock(). */ #define NO_LOCK 0 #define SHARED_LOCK 1 #define RESERVED_LOCK 2 #define PENDING_LOCK 3 #define EXCLUSIVE_LOCK 4 /* ** File Locking Notes: (Mostly about windows but also some info for Unix) ** ** We cannot use LockFileEx() or UnlockFileEx() on Win95/98/ME because ** those functions are not available. So we use only LockFile() and ** UnlockFile(). ** ** LockFile() prevents not just writing but also reading by other processes. ** A SHARED_LOCK is obtained by locking a single randomly-chosen ** byte out of a specific range of bytes. The lock byte is obtained at ** random so two separate readers can probably access the file at the ** same time, unless they are unlucky and choose the same lock byte. ** An EXCLUSIVE_LOCK is obtained by locking all bytes in the range. ** There can only be one writer. A RESERVED_LOCK is obtained by locking ** a single byte of the file that is designated as the reserved lock byte. ** A PENDING_LOCK is obtained by locking a designated byte different from ** the RESERVED_LOCK byte. ** ** On WinNT/2K/XP systems, LockFileEx() and UnlockFileEx() are available, ** which means we can use reader/writer locks. When reader/writer locks ** are used, the lock is placed on the same range of bytes that is used ** for probabilistic locking in Win95/98/ME. Hence, the locking scheme ** will support two or more Win95 readers or two or more WinNT readers. ** But a single Win95 reader will lock out all WinNT readers and a single ** WinNT reader will lock out all other Win95 readers. ** ** The following #defines specify the range of bytes used for locking. ** SHARED_SIZE is the number of bytes available in the pool from which ** a random byte is selected for a shared lock. The pool of bytes for ** shared locks begins at SHARED_FIRST. ** ** These #defines are available in sqlite_aux.h so that adaptors for ** connecting SQLite to other operating systems can use the same byte ** ranges for locking. In particular, the same locking strategy and ** byte ranges are used for Unix. This leaves open the possiblity of having ** clients on win95, winNT, and unix all talking to the same shared file ** and all locking correctly. To do so would require that samba (or whatever ** tool is being used for file sharing) implements locks correctly between ** windows and unix. I'm guessing that isn't likely to happen, but by ** using the same locking range we are at least open to the possibility. ** ** Locking in windows is manditory. For this reason, we cannot store ** actual data in the bytes used for locking. The pager never allocates ** the pages involved in locking therefore. SHARED_SIZE is selected so ** that all locks will fit on a single page even at the minimum page size. ** PENDING_BYTE defines the beginning of the locks. By default PENDING_BYTE ** is set high so that we don't have to allocate an unused page except ** for very large databases. But one should test the page skipping logic ** by setting PENDING_BYTE low and running the entire regression suite. ** ** Changing the value of PENDING_BYTE results in a subtly incompatible ** file format. Depending on how it is changed, you might not notice ** the incompatibility right away, even running a full regression test. ** The default location of PENDING_BYTE is the first byte past the ** 1GB boundary. ** */ #ifndef SQLITE_TEST #define PENDING_BYTE 0x40000000 /* First byte past the 1GB boundary */ #else SQLITE_API extern unsigned int sqlite3_pending_byte; #define PENDING_BYTE sqlite3_pending_byte #endif #define RESERVED_BYTE (PENDING_BYTE+1) #define SHARED_FIRST (PENDING_BYTE+2) #define SHARED_SIZE 510 /* ** Functions for accessing sqlite3_file methods */ SQLITE_PRIVATE int sqlite3OsClose(sqlite3_file*); SQLITE_PRIVATE int sqlite3OsRead(sqlite3_file*, void*, int amt, i64 offset); SQLITE_PRIVATE int sqlite3OsWrite(sqlite3_file*, const void*, int amt, i64 offset); SQLITE_PRIVATE int sqlite3OsTruncate(sqlite3_file*, i64 size); SQLITE_PRIVATE int sqlite3OsSync(sqlite3_file*, int); SQLITE_PRIVATE int sqlite3OsFileSize(sqlite3_file*, i64 *pSize); SQLITE_PRIVATE int sqlite3OsLock(sqlite3_file*, int); SQLITE_PRIVATE int sqlite3OsUnlock(sqlite3_file*, int); SQLITE_PRIVATE int sqlite3OsCheckReservedLock(sqlite3_file *id); SQLITE_PRIVATE int sqlite3OsFileControl(sqlite3_file*,int,void*); SQLITE_PRIVATE int sqlite3OsSectorSize(sqlite3_file *id); SQLITE_PRIVATE int sqlite3OsDeviceCharacteristics(sqlite3_file *id); /* ** Functions for accessing sqlite3_vfs methods */ SQLITE_PRIVATE int sqlite3OsOpen(sqlite3_vfs *, const char *, sqlite3_file*, int, int *); SQLITE_PRIVATE int sqlite3OsDelete(sqlite3_vfs *, const char *, int); SQLITE_PRIVATE int sqlite3OsAccess(sqlite3_vfs *, const char *, int); SQLITE_PRIVATE int sqlite3OsGetTempname(sqlite3_vfs *, int, char *); SQLITE_PRIVATE int sqlite3OsFullPathname(sqlite3_vfs *, const char *, int, char *); SQLITE_PRIVATE void *sqlite3OsDlOpen(sqlite3_vfs *, const char *); SQLITE_PRIVATE void sqlite3OsDlError(sqlite3_vfs *, int, char *); SQLITE_PRIVATE void *sqlite3OsDlSym(sqlite3_vfs *, void *, const char *); SQLITE_PRIVATE void sqlite3OsDlClose(sqlite3_vfs *, void *); SQLITE_PRIVATE int sqlite3OsRandomness(sqlite3_vfs *, int, char *); SQLITE_PRIVATE int sqlite3OsSleep(sqlite3_vfs *, int); SQLITE_PRIVATE int sqlite3OsCurrentTime(sqlite3_vfs *, double*); /* ** Convenience functions for opening and closing files using ** sqlite3_malloc() to obtain space for the file-handle structure. */ SQLITE_PRIVATE int sqlite3OsOpenMalloc(sqlite3_vfs *, const char *, sqlite3_file **, int,int*); SQLITE_PRIVATE int sqlite3OsCloseFree(sqlite3_file *); /* ** Each OS-specific backend defines an instance of the following ** structure for returning a pointer to its sqlite3_vfs. If OS_OTHER ** is defined (meaning that the application-defined OS interface layer ** is used) then there is no default VFS. The application must ** register one or more VFS structures using sqlite3_vfs_register() ** before attempting to use SQLite. */ SQLITE_PRIVATE sqlite3_vfs *sqlite3OsDefaultVfs(void); #endif /* _SQLITE_OS_H_ */ /************** End of os.h **************************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /************** Include mutex.h in the middle of sqliteInt.h *****************/ /************** Begin file mutex.h *******************************************/ /* ** 2007 August 28 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains the common header for all mutex implementations. ** The sqliteInt.h header #includes this file so that it is available ** to all source files. We break it out in an effort to keep the code ** better organized. ** ** NOTE: source files should *not* #include this header file directly. ** Source files should #include the sqliteInt.h file and let that file ** include this one indirectly. ** ** $Id: mutex.h,v 1.2 2007/08/30 14:10:30 drh Exp $ */ #ifdef SQLITE_MUTEX_APPDEF /* ** If SQLITE_MUTEX_APPDEF is defined, then this whole module is ** omitted and equivalent functionality must be provided by the ** application that links against the SQLite library. */ #else /* ** Figure out what version of the code to use. The choices are ** ** SQLITE_MUTEX_NOOP For single-threaded applications that ** do not desire error checking. ** ** SQLITE_MUTEX_NOOP_DEBUG For single-threaded applications with ** error checking to help verify that mutexes ** are being used correctly even though they ** are not needed. Used when SQLITE_DEBUG is ** defined on single-threaded builds. ** ** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix. ** ** SQLITE_MUTEX_W32 For multi-threaded applications on Win32. ** ** SQLITE_MUTEX_OS2 For multi-threaded applications on OS/2. */ #define SQLITE_MUTEX_NOOP 1 /* The default */ #if defined(SQLITE_DEBUG) && !SQLITE_THREADSAFE # undef SQLITE_MUTEX_NOOP # define SQLITE_MUTEX_NOOP_DEBUG #endif #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_UNIX # undef SQLITE_MUTEX_NOOP # define SQLITE_MUTEX_PTHREADS #endif #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_WIN # undef SQLITE_MUTEX_NOOP # define SQLITE_MUTEX_W32 #endif #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_OS2 # undef SQLITE_MUTEX_NOOP # define SQLITE_MUTEX_OS2 #endif #ifdef SQLITE_MUTEX_NOOP /* ** If this is a no-op implementation, implement everything as macros. */ #define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8) #define sqlite3_mutex_free(X) #define sqlite3_mutex_enter(X) #define sqlite3_mutex_try(X) SQLITE_OK #define sqlite3_mutex_leave(X) #define sqlite3_mutex_held(X) 1 #define sqlite3_mutex_notheld(X) 1 #endif #endif /* SQLITE_MUTEX_APPDEF */ /************** End of mutex.h ***********************************************/ /************** Continuing where we left off in sqliteInt.h ******************/ /* ** Each database file to be accessed by the system is an instance ** of the following structure. There are normally two of these structures ** in the sqlite.aDb[] array. aDb[0] is the main database file and ** aDb[1] is the database file used to hold temporary tables. Additional ** databases may be attached. */ struct Db { char *zName; /* Name of this database */ Btree *pBt; /* The B*Tree structure for this database file */ u8 inTrans; /* 0: not writable. 1: Transaction. 2: Checkpoint */ u8 safety_level; /* How aggressive at synching data to disk */ void *pAux; /* Auxiliary data. Usually NULL */ void (*xFreeAux)(void*); /* Routine to free pAux */ Schema *pSchema; /* Pointer to database schema (possibly shared) */ }; /* ** An instance of the following structure stores a database schema. ** ** If there are no virtual tables configured in this schema, the ** Schema.db variable is set to NULL. After the first virtual table ** has been added, it is set to point to the database connection ** used to create the connection. Once a virtual table has been ** added to the Schema structure and the Schema.db variable populated, ** only that database connection may use the Schema to prepare ** statements. */ struct Schema { int schema_cookie; /* Database schema version number for this file */ Hash tblHash; /* All tables indexed by name */ Hash idxHash; /* All (named) indices indexed by name */ Hash trigHash; /* All triggers indexed by name */ Hash aFKey; /* Foreign keys indexed by to-table */ Table *pSeqTab; /* The sqlite_sequence table used by AUTOINCREMENT */ u8 file_format; /* Schema format version for this file */ u8 enc; /* Text encoding used by this database */ u16 flags; /* Flags associated with this schema */ int cache_size; /* Number of pages to use in the cache */ #ifndef SQLITE_OMIT_VIRTUALTABLE sqlite3 *db; /* "Owner" connection. See comment above */ #endif }; /* ** These macros can be used to test, set, or clear bits in the ** Db.flags field. */ #define DbHasProperty(D,I,P) (((D)->aDb[I].pSchema->flags&(P))==(P)) #define DbHasAnyProperty(D,I,P) (((D)->aDb[I].pSchema->flags&(P))!=0) #define DbSetProperty(D,I,P) (D)->aDb[I].pSchema->flags|=(P) #define DbClearProperty(D,I,P) (D)->aDb[I].pSchema->flags&=~(P) /* ** Allowed values for the DB.flags field. ** ** The DB_SchemaLoaded flag is set after the database schema has been ** read into internal hash tables. ** ** DB_UnresetViews means that one or more views have column names that ** have been filled out. If the schema changes, these column names might ** changes and so the view will need to be reset. */ #define DB_SchemaLoaded 0x0001 /* The schema has been loaded */ #define DB_UnresetViews 0x0002 /* Some views have defined column names */ #define DB_Empty 0x0004 /* The file is empty (length 0 bytes) */ /* ** The number of different kinds of things that can be limited ** using the sqlite3_limit() interface. */ #define SQLITE_N_LIMIT (SQLITE_LIMIT_VARIABLE_NUMBER+1) /* ** Each database is an instance of the following structure. ** ** The sqlite.lastRowid records the last insert rowid generated by an ** insert statement. Inserts on views do not affect its value. Each ** trigger has its own context, so that lastRowid can be updated inside ** triggers as usual. The previous value will be restored once the trigger ** exits. Upon entering a before or instead of trigger, lastRowid is no ** longer (since after version 2.8.12) reset to -1. ** ** The sqlite.nChange does not count changes within triggers and keeps no ** context. It is reset at start of sqlite3_exec. ** The sqlite.lsChange represents the number of changes made by the last ** insert, update, or delete statement. It remains constant throughout the ** length of a statement and is then updated by OP_SetCounts. It keeps a ** context stack just like lastRowid so that the count of changes ** within a trigger is not seen outside the trigger. Changes to views do not ** affect the value of lsChange. ** The sqlite.csChange keeps track of the number of current changes (since ** the last statement) and is used to update sqlite_lsChange. ** ** The member variables sqlite.errCode, sqlite.zErrMsg and sqlite.zErrMsg16 ** store the most recent error code and, if applicable, string. The ** internal function sqlite3Error() is used to set these variables ** consistently. */ struct sqlite3 { sqlite3_vfs *pVfs; /* OS Interface */ int nDb; /* Number of backends currently in use */ Db *aDb; /* All backends */ int flags; /* Miscellanous flags. See below */ int openFlags; /* Flags passed to sqlite3_vfs.xOpen() */ int errCode; /* Most recent error code (SQLITE_*) */ int errMask; /* & result codes with this before returning */ u8 autoCommit; /* The auto-commit flag. */ u8 temp_store; /* 1: file 2: memory 0: default */ u8 mallocFailed; /* True if we have seen a malloc failure */ u8 dfltLockMode; /* Default locking-mode for attached dbs */ u8 dfltJournalMode; /* Default journal mode for attached dbs */ signed char nextAutovac; /* Autovac setting after VACUUM if >=0 */ int nextPagesize; /* Pagesize after VACUUM if >0 */ int nTable; /* Number of tables in the database */ CollSeq *pDfltColl; /* The default collating sequence (BINARY) */ i64 lastRowid; /* ROWID of most recent insert (see above) */ i64 priorNewRowid; /* Last randomly generated ROWID */ int magic; /* Magic number for detect library misuse */ int nChange; /* Value returned by sqlite3_changes() */ int nTotalChange; /* Value returned by sqlite3_total_changes() */ sqlite3_mutex *mutex; /* Connection mutex */ int aLimit[SQLITE_N_LIMIT]; /* Limits */ struct sqlite3InitInfo { /* Information used during initialization */ int iDb; /* When back is being initialized */ int newTnum; /* Rootpage of table being initialized */ u8 busy; /* TRUE if currently initializing */ } init; int nExtension; /* Number of loaded extensions */ void **aExtension; /* Array of shared libraray handles */ struct Vdbe *pVdbe; /* List of active virtual machines */ int activeVdbeCnt; /* Number of vdbes currently executing */ void (*xTrace)(void*,const char*); /* Trace function */ void *pTraceArg; /* Argument to the trace function */ void (*xProfile)(void*,const char*,u64); /* Profiling function */ void *pProfileArg; /* Argument to profile function */ void *pCommitArg; /* Argument to xCommitCallback() */ int (*xCommitCallback)(void*); /* Invoked at every commit. */ void *pRollbackArg; /* Argument to xRollbackCallback() */ void (*xRollbackCallback)(void*); /* Invoked at every commit. */ void *pUpdateArg; void (*xUpdateCallback)(void*,int, const char*,const char*,sqlite_int64); void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*); void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*); void *pCollNeededArg; sqlite3_value *pErr; /* Most recent error message */ char *zErrMsg; /* Most recent error message (UTF-8 encoded) */ char *zErrMsg16; /* Most recent error message (UTF-16 encoded) */ union { int isInterrupted; /* True if sqlite3_interrupt has been called */ double notUsed1; /* Spacer */ } u1; #ifndef SQLITE_OMIT_AUTHORIZATION int (*xAuth)(void*,int,const char*,const char*,const char*,const char*); /* Access authorization function */ void *pAuthArg; /* 1st argument to the access auth function */ #endif #ifndef SQLITE_OMIT_PROGRESS_CALLBACK int (*xProgress)(void *); /* The progress callback */ void *pProgressArg; /* Argument to the progress callback */ int nProgressOps; /* Number of opcodes for progress callback */ #endif #ifndef SQLITE_OMIT_VIRTUALTABLE Hash aModule; /* populated by sqlite3_create_module() */ Table *pVTab; /* vtab with active Connect/Create method */ sqlite3_vtab **aVTrans; /* Virtual tables with open transactions */ int nVTrans; /* Allocated size of aVTrans */ #endif Hash aFunc; /* All functions that can be in SQL exprs */ Hash aCollSeq; /* All collating sequences */ BusyHandler busyHandler; /* Busy callback */ int busyTimeout; /* Busy handler timeout, in msec */ Db aDbStatic[2]; /* Static space for the 2 default backends */ #ifdef SQLITE_SSE sqlite3_stmt *pFetch; /* Used by SSE to fetch stored statements */ #endif }; /* ** A macro to discover the encoding of a database. */ #define ENC(db) ((db)->aDb[0].pSchema->enc) /* ** Possible values for the sqlite.flags and or Db.flags fields. ** ** On sqlite.flags, the SQLITE_InTrans value means that we have ** executed a BEGIN. On Db.flags, SQLITE_InTrans means a statement ** transaction is active on that particular database file. */ #define SQLITE_VdbeTrace 0x00000001 /* True to trace VDBE execution */ #define SQLITE_InTrans 0x00000008 /* True if in a transaction */ #define SQLITE_InternChanges 0x00000010 /* Uncommitted Hash table changes */ #define SQLITE_FullColNames 0x00000020 /* Show full column names on SELECT */ #define SQLITE_ShortColNames 0x00000040 /* Show short columns names */ #define SQLITE_CountRows 0x00000080 /* Count rows changed by INSERT, */ /* DELETE, or UPDATE and return */ /* the count using a callback. */ #define SQLITE_NullCallback 0x00000100 /* Invoke the callback once if the */ /* result set is empty */ #define SQLITE_SqlTrace 0x00000200 /* Debug print SQL as it executes */ #define SQLITE_VdbeListing 0x00000400 /* Debug listings of VDBE programs */ #define SQLITE_WriteSchema 0x00000800 /* OK to update SQLITE_MASTER */ #define SQLITE_NoReadlock 0x00001000 /* Readlocks are omitted when ** accessing read-only databases */ #define SQLITE_IgnoreChecks 0x00002000 /* Do not enforce check constraints */ #define SQLITE_ReadUncommitted 0x00004000 /* For shared-cache mode */ #define SQLITE_LegacyFileFmt 0x00008000 /* Create new databases in format 1 */ #define SQLITE_FullFSync 0x00010000 /* Use full fsync on the backend */ #define SQLITE_LoadExtension 0x00020000 /* Enable load_extension */ #define SQLITE_RecoveryMode 0x00040000 /* Ignore schema errors */ #define SQLITE_SharedCache 0x00080000 /* Cache sharing is enabled */ #define SQLITE_Vtab 0x00100000 /* There exists a virtual table */ /* ** Possible values for the sqlite.magic field. ** The numbers are obtained at random and have no special meaning, other ** than being distinct from one another. */ #define SQLITE_MAGIC_OPEN 0xa029a697 /* Database is open */ #define SQLITE_MAGIC_CLOSED 0x9f3c2d33 /* Database is closed */ #define SQLITE_MAGIC_SICK 0x4b771290 /* Error and awaiting close */ #define SQLITE_MAGIC_BUSY 0xf03b7906 /* Database currently in use */ #define SQLITE_MAGIC_ERROR 0xb5357930 /* An SQLITE_MISUSE error occurred */ /* ** Each SQL function is defined by an instance of the following ** structure. A pointer to this structure is stored in the sqlite.aFunc ** hash table. When multiple functions have the same name, the hash table ** points to a linked list of these structures. */ struct FuncDef { i16 nArg; /* Number of arguments. -1 means unlimited */ u8 iPrefEnc; /* Preferred text encoding (SQLITE_UTF8, 16LE, 16BE) */ u8 needCollSeq; /* True if sqlite3GetFuncCollSeq() might be called */ u8 flags; /* Some combination of SQLITE_FUNC_* */ void *pUserData; /* User data parameter */ FuncDef *pNext; /* Next function with same name */ void (*xFunc)(sqlite3_context*,int,sqlite3_value**); /* Regular function */ void (*xStep)(sqlite3_context*,int,sqlite3_value**); /* Aggregate step */ void (*xFinalize)(sqlite3_context*); /* Aggregate finializer */ char zName[1]; /* SQL name of the function. MUST BE LAST */ }; /* ** Each SQLite module (virtual table definition) is defined by an ** instance of the following structure, stored in the sqlite3.aModule ** hash table. */ struct Module { const sqlite3_module *pModule; /* Callback pointers */ const char *zName; /* Name passed to create_module() */ void *pAux; /* pAux passed to create_module() */ void (*xDestroy)(void *); /* Module destructor function */ }; /* ** Possible values for FuncDef.flags */ #define SQLITE_FUNC_LIKE 0x01 /* Candidate for the LIKE optimization */ #define SQLITE_FUNC_CASE 0x02 /* Case-sensitive LIKE-type function */ #define SQLITE_FUNC_EPHEM 0x04 /* Ephermeral. Delete with VDBE */ /* ** information about each column of an SQL table is held in an instance ** of this structure. */ struct Column { char *zName; /* Name of this column */ Expr *pDflt; /* Default value of this column */ char *zType; /* Data type for this column */ char *zColl; /* Collating sequence. If NULL, use the default */ u8 notNull; /* True if there is a NOT NULL constraint */ u8 isPrimKey; /* True if this column is part of the PRIMARY KEY */ char affinity; /* One of the SQLITE_AFF_... values */ #ifndef SQLITE_OMIT_VIRTUALTABLE u8 isHidden; /* True if this column is 'hidden' */ #endif }; /* ** A "Collating Sequence" is defined by an instance of the following ** structure. Conceptually, a collating sequence consists of a name and ** a comparison routine that defines the order of that sequence. ** ** There may two seperate implementations of the collation function, one ** that processes text in UTF-8 encoding (CollSeq.xCmp) and another that ** processes text encoded in UTF-16 (CollSeq.xCmp16), using the machine ** native byte order. When a collation sequence is invoked, SQLite selects ** the version that will require the least expensive encoding ** translations, if any. ** ** The CollSeq.pUser member variable is an extra parameter that passed in ** as the first argument to the UTF-8 comparison function, xCmp. ** CollSeq.pUser16 is the equivalent for the UTF-16 comparison function, ** xCmp16. ** ** If both CollSeq.xCmp and CollSeq.xCmp16 are NULL, it means that the ** collating sequence is undefined. Indices built on an undefined ** collating sequence may not be read or written. */ struct CollSeq { char *zName; /* Name of the collating sequence, UTF-8 encoded */ u8 enc; /* Text encoding handled by xCmp() */ u8 type; /* One of the SQLITE_COLL_... values below */ void *pUser; /* First argument to xCmp() */ int (*xCmp)(void*,int, const void*, int, const void*); void (*xDel)(void*); /* Destructor for pUser */ }; /* ** Allowed values of CollSeq flags: */ #define SQLITE_COLL_BINARY 1 /* The default memcmp() collating sequence */ #define SQLITE_COLL_NOCASE 2 /* The built-in NOCASE collating sequence */ #define SQLITE_COLL_REVERSE 3 /* The built-in REVERSE collating sequence */ #define SQLITE_COLL_USER 0 /* Any other user-defined collating sequence */ /* ** A sort order can be either ASC or DESC. */ #define SQLITE_SO_ASC 0 /* Sort in ascending order */ #define SQLITE_SO_DESC 1 /* Sort in ascending order */ /* ** Column affinity types. ** ** These used to have mnemonic name like 'i' for SQLITE_AFF_INTEGER and ** 't' for SQLITE_AFF_TEXT. But we can save a little space and improve ** the speed a little by number the values consecutively. ** ** But rather than start with 0 or 1, we begin with 'a'. That way, ** when multiple affinity types are concatenated into a string and ** used as the P4 operand, they will be more readable. ** ** Note also that the numeric types are grouped together so that testing ** for a numeric type is a single comparison. */ #define SQLITE_AFF_TEXT 'a' #define SQLITE_AFF_NONE 'b' #define SQLITE_AFF_NUMERIC 'c' #define SQLITE_AFF_INTEGER 'd' #define SQLITE_AFF_REAL 'e' #define sqlite3IsNumericAffinity(X) ((X)>=SQLITE_AFF_NUMERIC) /* ** The SQLITE_AFF_MASK values masks off the significant bits of an ** affinity value. */ #define SQLITE_AFF_MASK 0x67 /* ** Additional bit values that can be ORed with an affinity without ** changing the affinity. */ #define SQLITE_JUMPIFNULL 0x08 /* jumps if either operand is NULL */ #define SQLITE_NULLEQUAL 0x10 /* compare NULLs equal */ #define SQLITE_STOREP2 0x80 /* Store result in reg[P2] rather than jump */ /* ** Each SQL table is represented in memory by an instance of the ** following structure. ** ** Table.zName is the name of the table. The case of the original ** CREATE TABLE statement is stored, but case is not significant for ** comparisons. ** ** Table.nCol is the number of columns in this table. Table.aCol is a ** pointer to an array of Column structures, one for each column. ** ** If the table has an INTEGER PRIMARY KEY, then Table.iPKey is the index of ** the column that is that key. Otherwise Table.iPKey is negative. Note ** that the datatype of the PRIMARY KEY must be INTEGER for this field to ** be set. An INTEGER PRIMARY KEY is used as the rowid for each row of ** the table. If a table has no INTEGER PRIMARY KEY, then a random rowid ** is generated for each row of the table. Table.hasPrimKey is true if ** the table has any PRIMARY KEY, INTEGER or otherwise. ** ** Table.tnum is the page number for the root BTree page of the table in the ** database file. If Table.iDb is the index of the database table backend ** in sqlite.aDb[]. 0 is for the main database and 1 is for the file that ** holds temporary tables and indices. If Table.isEphem ** is true, then the table is stored in a file that is automatically deleted ** when the VDBE cursor to the table is closed. In this case Table.tnum ** refers VDBE cursor number that holds the table open, not to the root ** page number. Transient tables are used to hold the results of a ** sub-query that appears instead of a real table name in the FROM clause ** of a SELECT statement. */ struct Table { char *zName; /* Name of the table */ int nCol; /* Number of columns in this table */ Column *aCol; /* Information about each column */ int iPKey; /* If not less then 0, use aCol[iPKey] as the primary key */ Index *pIndex; /* List of SQL indexes on this table. */ int tnum; /* Root BTree node for this table (see note above) */ Select *pSelect; /* NULL for tables. Points to definition if a view. */ int nRef; /* Number of pointers to this Table */ Trigger *pTrigger; /* List of SQL triggers on this table */ FKey *pFKey; /* Linked list of all foreign keys in this table */ char *zColAff; /* String defining the affinity of each column */ #ifndef SQLITE_OMIT_CHECK Expr *pCheck; /* The AND of all CHECK constraints */ #endif #ifndef SQLITE_OMIT_ALTERTABLE int addColOffset; /* Offset in CREATE TABLE statement to add a new column */ #endif u8 readOnly; /* True if this table should not be written by the user */ u8 isEphem; /* True if created using OP_OpenEphermeral */ u8 hasPrimKey; /* True if there exists a primary key */ u8 keyConf; /* What to do in case of uniqueness conflict on iPKey */ u8 autoInc; /* True if the integer primary key is autoincrement */ #ifndef SQLITE_OMIT_VIRTUALTABLE u8 isVirtual; /* True if this is a virtual table */ u8 isCommit; /* True once the CREATE TABLE has been committed */ Module *pMod; /* Pointer to the implementation of the module */ sqlite3_vtab *pVtab; /* Pointer to the module instance */ int nModuleArg; /* Number of arguments to the module */ char **azModuleArg; /* Text of all module args. [0] is module name */ #endif Schema *pSchema; /* Schema that contains this table */ }; /* ** Test to see whether or not a table is a virtual table. This is ** done as a macro so that it will be optimized out when virtual ** table support is omitted from the build. */ #ifndef SQLITE_OMIT_VIRTUALTABLE # define IsVirtual(X) ((X)->isVirtual) # define IsHiddenColumn(X) ((X)->isHidden) #else # define IsVirtual(X) 0 # define IsHiddenColumn(X) 0 #endif /* ** Each foreign key constraint is an instance of the following structure. ** ** A foreign key is associated with two tables. The "from" table is ** the table that contains the REFERENCES clause that creates the foreign ** key. The "to" table is the table that is named in the REFERENCES clause. ** Consider this example: ** ** CREATE TABLE ex1( ** a INTEGER PRIMARY KEY, ** b INTEGER CONSTRAINT fk1 REFERENCES ex2(x) ** ); ** ** For foreign key "fk1", the from-table is "ex1" and the to-table is "ex2". ** ** Each REFERENCES clause generates an instance of the following structure ** which is attached to the from-table. The to-table need not exist when ** the from-table is created. The existance of the to-table is not checked ** until an attempt is made to insert data into the from-table. ** ** The sqlite.aFKey hash table stores pointers to this structure ** given the name of a to-table. For each to-table, all foreign keys ** associated with that table are on a linked list using the FKey.pNextTo ** field. */ struct FKey { Table *pFrom; /* The table that constains the REFERENCES clause */ FKey *pNextFrom; /* Next foreign key in pFrom */ char *zTo; /* Name of table that the key points to */ FKey *pNextTo; /* Next foreign key that points to zTo */ int nCol; /* Number of columns in this key */ struct sColMap { /* Mapping of columns in pFrom to columns in zTo */ int iFrom; /* Index of column in pFrom */ char *zCol; /* Name of column in zTo. If 0 use PRIMARY KEY */ } *aCol; /* One entry for each of nCol column s */ u8 isDeferred; /* True if constraint checking is deferred till COMMIT */ u8 updateConf; /* How to resolve conflicts that occur on UPDATE */ u8 deleteConf; /* How to resolve conflicts that occur on DELETE */ u8 insertConf; /* How to resolve conflicts that occur on INSERT */ }; /* ** SQLite supports many different ways to resolve a constraint ** error. ROLLBACK processing means that a constraint violation ** causes the operation in process to fail and for the current transaction ** to be rolled back. ABORT processing means the operation in process ** fails and any prior changes from that one operation are backed out, ** but the transaction is not rolled back. FAIL processing means that ** the operation in progress stops and returns an error code. But prior ** changes due to the same operation are not backed out and no rollback ** occurs. IGNORE means that the particular row that caused the constraint ** error is not inserted or updated. Processing continues and no error ** is returned. REPLACE means that preexisting database rows that caused ** a UNIQUE constraint violation are removed so that the new insert or ** update can proceed. Processing continues and no error is reported. ** ** RESTRICT, SETNULL, and CASCADE actions apply only to foreign keys. ** RESTRICT is the same as ABORT for IMMEDIATE foreign keys and the ** same as ROLLBACK for DEFERRED keys. SETNULL means that the foreign ** key is set to NULL. CASCADE means that a DELETE or UPDATE of the ** referenced table row is propagated into the row that holds the ** foreign key. ** ** The following symbolic values are used to record which type ** of action to take. */ #define OE_None 0 /* There is no constraint to check */ #define OE_Rollback 1 /* Fail the operation and rollback the transaction */ #define OE_Abort 2 /* Back out changes but do no rollback transaction */ #define OE_Fail 3 /* Stop the operation but leave all prior changes */ #define OE_Ignore 4 /* Ignore the error. Do not do the INSERT or UPDATE */ #define OE_Replace 5 /* Delete existing record, then do INSERT or UPDATE */ #define OE_Restrict 6 /* OE_Abort for IMMEDIATE, OE_Rollback for DEFERRED */ #define OE_SetNull 7 /* Set the foreign key value to NULL */ #define OE_SetDflt 8 /* Set the foreign key value to its default */ #define OE_Cascade 9 /* Cascade the changes */ #define OE_Default 99 /* Do whatever the default action is */ /* ** An instance of the following structure is passed as the first ** argument to sqlite3VdbeKeyCompare and is used to control the ** comparison of the two index keys. ** ** If the KeyInfo.incrKey value is true and the comparison would ** otherwise be equal, then return a result as if the second key ** were larger. */ struct KeyInfo { sqlite3 *db; /* The database connection */ u8 enc; /* Text encoding - one of the TEXT_Utf* values */ u8 incrKey; /* Increase 2nd key by epsilon before comparison */ u8 prefixIsEqual; /* Treat a prefix as equal */ int nField; /* Number of entries in aColl[] */ u8 *aSortOrder; /* If defined an aSortOrder[i] is true, sort DESC */ CollSeq *aColl[1]; /* Collating sequence for each term of the key */ }; /* ** Each SQL index is represented in memory by an ** instance of the following structure. ** ** The columns of the table that are to be indexed are described ** by the aiColumn[] field of this structure. For example, suppose ** we have the following table and index: ** ** CREATE TABLE Ex1(c1 int, c2 int, c3 text); ** CREATE INDEX Ex2 ON Ex1(c3,c1); ** ** In the Table structure describing Ex1, nCol==3 because there are ** three columns in the table. In the Index structure describing ** Ex2, nColumn==2 since 2 of the 3 columns of Ex1 are indexed. ** The value of aiColumn is {2, 0}. aiColumn[0]==2 because the ** first column to be indexed (c3) has an index of 2 in Ex1.aCol[]. ** The second column to be indexed (c1) has an index of 0 in ** Ex1.aCol[], hence Ex2.aiColumn[1]==0. ** ** The Index.onError field determines whether or not the indexed columns ** must be unique and what to do if they are not. When Index.onError=OE_None, ** it means this is not a unique index. Otherwise it is a unique index ** and the value of Index.onError indicate the which conflict resolution ** algorithm to employ whenever an attempt is made to insert a non-unique ** element. */ struct Index { char *zName; /* Name of this index */ int nColumn; /* Number of columns in the table used by this index */ int *aiColumn; /* Which columns are used by this index. 1st is 0 */ unsigned *aiRowEst; /* Result of ANALYZE: Est. rows selected by each column */ Table *pTable; /* The SQL table being indexed */ int tnum; /* Page containing root of this index in database file */ u8 onError; /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */ u8 autoIndex; /* True if is automatically created (ex: by UNIQUE) */ char *zColAff; /* String defining the affinity of each column */ Index *pNext; /* The next index associated with the same table */ Schema *pSchema; /* Schema containing this index */ u8 *aSortOrder; /* Array of size Index.nColumn. True==DESC, False==ASC */ char **azColl; /* Array of collation sequence names for index */ }; /* ** Each token coming out of the lexer is an instance of ** this structure. Tokens are also used as part of an expression. ** ** Note if Token.z==0 then Token.dyn and Token.n are undefined and ** may contain random values. Do not make any assuptions about Token.dyn ** and Token.n when Token.z==0. */ struct Token { const unsigned char *z; /* Text of the token. Not NULL-terminated! */ unsigned dyn : 1; /* True for malloced memory, false for static */ unsigned n : 31; /* Number of characters in this token */ }; /* ** An instance of this structure contains information needed to generate ** code for a SELECT that contains aggregate functions. ** ** If Expr.op==TK_AGG_COLUMN or TK_AGG_FUNCTION then Expr.pAggInfo is a ** pointer to this structure. The Expr.iColumn field is the index in ** AggInfo.aCol[] or AggInfo.aFunc[] of information needed to generate ** code for that node. ** ** AggInfo.pGroupBy and AggInfo.aFunc.pExpr point to fields within the ** original Select structure that describes the SELECT statement. These ** fields do not need to be freed when deallocating the AggInfo structure. */ struct AggInfo { u8 directMode; /* Direct rendering mode means take data directly ** from source tables rather than from accumulators */ u8 useSortingIdx; /* In direct mode, reference the sorting index rather ** than the source table */ int sortingIdx; /* Cursor number of the sorting index */ ExprList *pGroupBy; /* The group by clause */ int nSortingColumn; /* Number of columns in the sorting index */ struct AggInfo_col { /* For each column used in source tables */ Table *pTab; /* Source table */ int iTable; /* Cursor number of the source table */ int iColumn; /* Column number within the source table */ int iSorterColumn; /* Column number in the sorting index */ int iMem; /* Memory location that acts as accumulator */ Expr *pExpr; /* The original expression */ } *aCol; int nColumn; /* Number of used entries in aCol[] */ int nColumnAlloc; /* Number of slots allocated for aCol[] */ int nAccumulator; /* Number of columns that show through to the output. ** Additional columns are used only as parameters to ** aggregate functions */ struct AggInfo_func { /* For each aggregate function */ Expr *pExpr; /* Expression encoding the function */ FuncDef *pFunc; /* The aggregate function implementation */ int iMem; /* Memory location that acts as accumulator */ int iDistinct; /* Ephermeral table used to enforce DISTINCT */ } *aFunc; int nFunc; /* Number of entries in aFunc[] */ int nFuncAlloc; /* Number of slots allocated for aFunc[] */ }; /* ** Each node of an expression in the parse tree is an instance ** of this structure. ** ** Expr.op is the opcode. The integer parser token codes are reused ** as opcodes here. For example, the parser defines TK_GE to be an integer ** code representing the ">=" operator. This same integer code is reused ** to represent the greater-than-or-equal-to operator in the expression ** tree. ** ** Expr.pRight and Expr.pLeft are subexpressions. Expr.pList is a list ** of argument if the expression is a function. ** ** Expr.token is the operator token for this node. For some expressions ** that have subexpressions, Expr.token can be the complete text that gave ** rise to the Expr. In the latter case, the token is marked as being ** a compound token. ** ** An expression of the form ID or ID.ID refers to a column in a table. ** For such expressions, Expr.op is set to TK_COLUMN and Expr.iTable is ** the integer cursor number of a VDBE cursor pointing to that table and ** Expr.iColumn is the column number for the specific column. If the ** expression is used as a result in an aggregate SELECT, then the ** value is also stored in the Expr.iAgg column in the aggregate so that ** it can be accessed after all aggregates are computed. ** ** If the expression is a function, the Expr.iTable is an integer code ** representing which function. If the expression is an unbound variable ** marker (a question mark character '?' in the original SQL) then the ** Expr.iTable holds the index number for that variable. ** ** If the expression is a subquery then Expr.iColumn holds an integer ** register number containing the result of the subquery. If the ** subquery gives a constant result, then iTable is -1. If the subquery ** gives a different answer at different times during statement processing ** then iTable is the address of a subroutine that computes the subquery. ** ** The Expr.pSelect field points to a SELECT statement. The SELECT might ** be the right operand of an IN operator. Or, if a scalar SELECT appears ** in an expression the opcode is TK_SELECT and Expr.pSelect is the only ** operand. ** ** If the Expr is of type OP_Column, and the table it is selecting from ** is a disk table or the "old.*" pseudo-table, then pTab points to the ** corresponding table definition. */ struct Expr { u8 op; /* Operation performed by this node */ char affinity; /* The affinity of the column or 0 if not a column */ u16 flags; /* Various flags. See below */ CollSeq *pColl; /* The collation type of the column or 0 */ Expr *pLeft, *pRight; /* Left and right subnodes */ ExprList *pList; /* A list of expressions used as function arguments ** or in " IN (aCol[] or ->aFunc[] */ int iRightJoinTable; /* If EP_FromJoin, the right table of the join */ Select *pSelect; /* When the expression is a sub-select. Also the ** right side of " IN (