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| author | Timothy Pearson <[email protected]> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <[email protected]> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qsqldatabase.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
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| -rw-r--r-- | doc/html/qsqldatabase.html | 668 |
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diff --git a/doc/html/qsqldatabase.html b/doc/html/qsqldatabase.html new file mode 100644 index 0000000..2c3a7ff --- /dev/null +++ b/doc/html/qsqldatabase.html @@ -0,0 +1,668 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/sql/qsqldatabase.cpp:353 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QSqlDatabase Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QSqlDatabase Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1> + +<p>The QSqlDatabase class is used to create SQL database +connections and to provide transaction handling. +<a href="#details">More...</a> +<p><tt>#include <<a href="qsqldatabase-h.html">qsqldatabase.h</a>></tt> +<p>Inherits <a href="qobject.html">QObject</a>. +<p><a href="qsqldatabase-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#~QSqlDatabase"><b>~QSqlDatabase</b></a> ()</li> +<li class=fn>bool <a href="#open"><b>open</b></a> ()</li> +<li class=fn>bool <a href="#open-2"><b>open</b></a> ( const QString & user, const QString & password )</li> +<li class=fn>void <a href="#close"><b>close</b></a> ()</li> +<li class=fn>bool <a href="#isOpen"><b>isOpen</b></a> () const</li> +<li class=fn>bool <a href="#isOpenError"><b>isOpenError</b></a> () const</li> +<li class=fn>QStringList <a href="#tables-2"><b>tables</b></a> () const</li> +<li class=fn>QStringList <a href="#tables"><b>tables</b></a> ( QSql::TableType type ) const</li> +<li class=fn>QSqlIndex <a href="#primaryIndex"><b>primaryIndex</b></a> ( const QString & tablename ) const</li> +<li class=fn>QSqlRecord <a href="#record"><b>record</b></a> ( const QString & tablename ) const</li> +<li class=fn>QSqlRecord <a href="#record-2"><b>record</b></a> ( const QSqlQuery & query ) const</li> +<li class=fn>QSqlRecordInfo <a href="#recordInfo"><b>recordInfo</b></a> ( const QString & tablename ) const</li> +<li class=fn>QSqlRecordInfo <a href="#recordInfo-2"><b>recordInfo</b></a> ( const QSqlQuery & query ) const</li> +<li class=fn>QSqlQuery <a href="#exec"><b>exec</b></a> ( const QString & query = QString::null ) const</li> +<li class=fn>QSqlError <a href="#lastError"><b>lastError</b></a> () const</li> +<li class=fn>bool <a href="#transaction"><b>transaction</b></a> ()</li> +<li class=fn>bool <a href="#commit"><b>commit</b></a> ()</li> +<li class=fn>bool <a href="#rollback"><b>rollback</b></a> ()</li> +<li class=fn>virtual void <a href="#setDatabaseName"><b>setDatabaseName</b></a> ( const QString & name )</li> +<li class=fn>virtual void <a href="#setUserName"><b>setUserName</b></a> ( const QString & name )</li> +<li class=fn>virtual void <a href="#setPassword"><b>setPassword</b></a> ( const QString & password )</li> +<li class=fn>virtual void <a href="#setHostName"><b>setHostName</b></a> ( const QString & host )</li> +<li class=fn>virtual void <a href="#setPort"><b>setPort</b></a> ( int p )</li> +<li class=fn>void <a href="#setConnectOptions"><b>setConnectOptions</b></a> ( const QString & options = QString::null )</li> +<li class=fn>QString <a href="#databaseName"><b>databaseName</b></a> () const</li> +<li class=fn>QString <a href="#userName"><b>userName</b></a> () const</li> +<li class=fn>QString <a href="#password"><b>password</b></a> () const</li> +<li class=fn>QString <a href="#hostName"><b>hostName</b></a> () const</li> +<li class=fn>QString <a href="#driverName"><b>driverName</b></a> () const</li> +<li class=fn>int <a href="#port"><b>port</b></a> () const</li> +<li class=fn>QString <a href="#connectOptions"><b>connectOptions</b></a> () const</li> +<li class=fn>QSqlDriver * <a href="#driver"><b>driver</b></a> () const</li> +</ul> +<h2>Static Public Members</h2> +<ul> +<li class=fn>QSqlDatabase * <a href="#addDatabase"><b>addDatabase</b></a> ( const QString & type, const QString & connectionName = defaultConnection )</li> +<li class=fn>QSqlDatabase * <a href="#addDatabase-2"><b>addDatabase</b></a> ( QSqlDriver * driver, const QString & connectionName = defaultConnection )</li> +<li class=fn>QSqlDatabase * <a href="#database"><b>database</b></a> ( const QString & connectionName = defaultConnection, bool open = TRUE )</li> +<li class=fn>void <a href="#removeDatabase"><b>removeDatabase</b></a> ( const QString & connectionName )</li> +<li class=fn>void <a href="#removeDatabase-2"><b>removeDatabase</b></a> ( QSqlDatabase * db )</li> +<li class=fn>bool <a href="#contains"><b>contains</b></a> ( const QString & connectionName = defaultConnection )</li> +<li class=fn>QStringList <a href="#drivers"><b>drivers</b></a> ()</li> +<li class=fn>void <a href="#registerSqlDriver"><b>registerSqlDriver</b></a> ( const QString & name, const QSqlDriverCreatorBase * creator )</li> +<li class=fn>bool <a href="#isDriverAvailable"><b>isDriverAvailable</b></a> ( const QString & name )</li> +</ul> +<h2>Properties</h2> +<ul> +<li class=fn>QString <a href="#connectOptions-prop"><b>connectOptions</b></a> - the database connect options</li> +<li class=fn>QString <a href="#databaseName-prop"><b>databaseName</b></a> - the name of the database</li> +<li class=fn>QString <a href="#hostName-prop"><b>hostName</b></a> - the host name where the database resides</li> +<li class=fn>QString <a href="#password-prop"><b>password</b></a> - the password used to connect to the database</li> +<li class=fn>int <a href="#port-prop"><b>port</b></a> - the port used to connect to the database</li> +<li class=fn>QString <a href="#userName-prop"><b>userName</b></a> - the user name connected to the database</li> +</ul> +<h2>Protected Members</h2> +<ul> +<li class=fn><a href="#QSqlDatabase"><b>QSqlDatabase</b></a> ( const QString & type, const QString & name, QObject * parent = 0, const char * objname = 0 )</li> +<li class=fn><a href="#QSqlDatabase-2"><b>QSqlDatabase</b></a> ( QSqlDriver * driver, QObject * parent = 0, const char * objname = 0 )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The QSqlDatabase class is used to create SQL database +connections and to provide transaction handling. +<p> + + +<p> Note that transaction handling is not supported by every SQL +database. You can find out whether transactions are supported +using <a href="qsqldriver.html#hasFeature">QSqlDriver::hasFeature</a>(). +<p> The QSqlDatabase class provides an abstract interface for +accessing many types of database backends. Database-specific +drivers are used internally to actually access and manipulate +data, (see <a href="qsqldriver.html">QSqlDriver</a>). Result set objects provide the interface +for executing and manipulating SQL queries (see <a href="qsqlquery.html">QSqlQuery</a>). +<p>See also <a href="database.html">Database Classes</a>. + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QSqlDatabase"></a>QSqlDatabase::QSqlDatabase ( const <a href="qstring.html">QString</a> & type, const <a href="qstring.html">QString</a> & name, <a href="qobject.html">QObject</a> * parent = 0, const char * objname = 0 )<tt> [protected]</tt> +</h3> +Creates a QSqlDatabase connection called <em>name</em> that uses the +driver referred to by <em>type</em>, with the parent <em>parent</em> and the +object name <em>objname</em>. If the <em>type</em> is not recognized, the +database connection will have no functionality. +<p> The currently available drivers are: +<p> <center><table cellpadding="4" cellspacing="2" border="0"> +<tr bgcolor="#a2c511"> <th valign="top">Driver Type <th valign="top">Description +<tr bgcolor="#f0f0f0"> <td valign="top"><a href="sql-driver.html#QODBC3">QODBC3</a> <td valign="top">ODBC Driver (includes Microsoft SQL Server) +<tr bgcolor="#d0d0d0"> <td valign="top"><a href="sql-driver.html#QOCI8">QOCI8</a> <td valign="top">Oracle Call Interface Driver +<tr bgcolor="#f0f0f0"> <td valign="top"><a href="sql-driver.html#QPSQL7">QPSQL7</a> <td valign="top">PostgreSQL v6.x and v7.x Driver +<tr bgcolor="#d0d0d0"> <td valign="top"><a href="sql-driver.html#QTDS7">QTDS7</a> <td valign="top">Sybase Adaptive Server +<tr bgcolor="#f0f0f0"> <td valign="top"><a href="sql-driver.html#QMYSQL3">QMYSQL3</a> <td valign="top">MySQL Driver +<tr bgcolor="#d0d0d0"> <td valign="top"><a href="sql-driver.html#QDB2">QDB2</a> <td valign="top">IBM DB2, v7.1 and higher +<tr bgcolor="#f0f0f0"> <td valign="top"><a href="sql-driver.html#QSQLITE">QSQLITE</a> <td valign="top">SQLite Driver +<tr bgcolor="#d0d0d0"> <td valign="top"><a href="sql-driver.html#QIBASE">QIBASE</a> <td valign="top">Borland Interbase Driver +</table></center> +<p> Additional third party drivers, including your own custom drivers, +can be loaded dynamically. +<p> <p>See also <a href="#registerSqlDriver">registerSqlDriver</a>(). + +<h3 class=fn><a name="QSqlDatabase-2"></a>QSqlDatabase::QSqlDatabase ( <a href="qsqldriver.html">QSqlDriver</a> * driver, <a href="qobject.html">QObject</a> * parent = 0, const char * objname = 0 )<tt> [protected]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Creates a database connection using the driver <em>driver</em>, with +the parent <em>parent</em> and the object name <em>objname</em>. +<p> <b>Warning:</b> The framework takes ownership of the <em>driver</em> pointer, +so it should not be deleted. + +<h3 class=fn><a name="~QSqlDatabase"></a>QSqlDatabase::~QSqlDatabase () +</h3> +Destroys the object and frees any allocated resources. + +<h3 class=fn><a href="qsqldatabase.html">QSqlDatabase</a> * <a name="addDatabase"></a>QSqlDatabase::addDatabase ( const <a href="qstring.html">QString</a> & type, const <a href="qstring.html">QString</a> & connectionName = defaultConnection )<tt> [static]</tt> +</h3> +Adds a database to the list of database connections using the +driver <em>type</em> and the connection name <em>connectionName</em>. +<p> The database connection is referred to by <em>connectionName</em>. The +newly added database connection is returned. This pointer is owned +by QSqlDatabase and will be deleted on program exit or when +<a href="#removeDatabase">removeDatabase</a>() is called. +<p> If <em>connectionName</em> is not specified, the newly added database +connection becomes the default database connection for the +application, and subsequent calls to <a href="#database">database</a>() (without a +database name parameter) will return a pointer to it. If <em>connectionName</em> is given, use <a href="#database">database(connectionName)</a> to retrieve a pointer to the +database connection. +<p> <b>Warning:</b> If you add a database with the same name as an +existing database, the new database will replace the old one. +This will happen automatically if you call this function more +than once without specifying <em>connectionName</em>. +<p> <p>See also <a href="#database">database</a>() and <a href="#removeDatabase">removeDatabase</a>(). + +<p>Examples: <a href="sql.html#x2141">sql/overview/connect1/main.cpp</a>, <a href="sql.html#x2147">sql/overview/connection.cpp</a>, and <a href="sqltable-example.html#x2454">sql/sqltable/main.cpp</a>. +<h3 class=fn><a href="qsqldatabase.html">QSqlDatabase</a> * <a name="addDatabase-2"></a>QSqlDatabase::addDatabase ( <a href="qsqldriver.html">QSqlDriver</a> * driver, const <a href="qstring.html">QString</a> & connectionName = defaultConnection )<tt> [static]</tt> +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This function is useful if you need to set up the database +connection and instantiate the driver yourself. If you do this, it +is recommended that you include the driver code in your own +application. For example, setting up a custom PostgreSQL +connection and instantiating the <a href="sql-driver.html#QPSQL7">QPSQL7</a> driver can be done the +following way: +<p> <pre> + #include "qtdir/src/sql/drivers/psql/qsql_psql.cpp" + </pre> + +(We assume that <tt>qtdir</tt> is the directory where Qt is installed.) +This will pull in the code that is needed to use the PostgreSQL +client library and to instantiate a QPSQLDriver object, assuming +that you have the PostgreSQL headers somewhere in your include +search path. +<p> <pre> + PGconn* con = PQconnectdb( "host=server user=bart password=simpson dbname=springfield" ); + QPSQLDriver* drv = new QPSQLDriver( con ); + QSqlDatabase* db = QSqlDatabase::<a href="#addDatabase">addDatabase</a>( drv ); // becomes the new default connection + <a href="qsqlquery.html">QSqlQuery</a> q; + q.<a href="qsqlquery.html#exec">exec</a>( "SELECT * FROM people" ); + ... + </pre> + +<p> The above code sets up a PostgreSQL connection and instantiates a +QPSQLDriver object. Next, <a href="#addDatabase">addDatabase</a>() is called to add the +connection to the known connections so that it can be used by the +Qt SQL classes. When a driver is instantiated with a connection +handle (or set of handles), Qt assumes that you have already +opened the database connection. +<p> Remember that you must link your application against the database +client library as well. The simplest way to do this is to add +lines like those below to your <tt>.pro</tt> file: +<p> <pre> + unix:LIBS += -lpq + win32:LIBS += libpqdll.lib + </pre> + +<p> You will need to have the client library in your linker's search +path. +<p> The method described above will work for all the drivers, the only +difference is the arguments the driver constructors take. Below is +an overview of the drivers and their constructor arguments. +<p> <center><table cellpadding="4" cellspacing="2" border="0"> +<tr bgcolor="#a2c511"> <th valign="top">Driver <th valign="top">Class name <th valign="top">Constructor arguments <th valign="top">File to include +<tr bgcolor="#f0f0f0"> +<td valign="top">QPSQL7 +<td valign="top">QPSQLDriver +<td valign="top">PGconn* connection +<td valign="top"><tt>qsql_psql.cpp</tt> +<tr bgcolor="#d0d0d0"> +<td valign="top"><a href="sql-driver.html#QMYSQL3">QMYSQL3</a> +<td valign="top">QMYSQLDriver +<td valign="top">MYSQL* connection +<td valign="top"><tt>qsql_mysql.cpp</tt> +<tr bgcolor="#f0f0f0"> +<td valign="top"><a href="sql-driver.html#QOCI8">QOCI8</a> +<td valign="top">QOCIDriver +<td valign="top">OCIEnv* environment, OCIError* error, OCISvcCtx* serviceContext +<td valign="top"><tt>qsql_oci.cpp</tt> +<tr bgcolor="#d0d0d0"> +<td valign="top"><a href="sql-driver.html#QODBC3">QODBC3</a> +<td valign="top">QODBCDriver +<td valign="top">SQLHANDLE environment, SQLHANDLE connection +<td valign="top"><tt>qsql_odbc.cpp</tt> +<tr bgcolor="#f0f0f0"> +<td valign="top"><a href="sql-driver.html#QDB2">QDB2</a> +<td valign="top">QDB2 +<td valign="top">SQLHANDLE environment, SQLHANDLE connection +<td valign="top"><tt>qsql_db2.cpp</tt> +<tr bgcolor="#d0d0d0"> +<td valign="top"><a href="sql-driver.html#QTDS7">QTDS7</a> +<td valign="top">QTDSDriver +<td valign="top">LOGINREC* loginRecord, DBPROCESS* dbProcess, const <a href="qstring.html">QString</a>& hostName +<td valign="top"><tt>qsql_tds.cpp</tt> +<tr bgcolor="#f0f0f0"> +<td valign="top"><a href="sql-driver.html#QSQLITE">QSQLITE</a> +<td valign="top">QSQLiteDriver +<td valign="top">sqlite* connection +<td valign="top"><tt>qsql_sqlite.cpp</tt> +<tr bgcolor="#d0d0d0"> +<td valign="top"><a href="sql-driver.html#QIBASE">QIBASE</a> +<td valign="top">QIBaseDriver +<td valign="top">isc_db_handle connection +<td valign="top"><tt>qsql_ibase.cpp</tt> +</table></center> +<p> Note: The host name (or service name) is needed when constructing +the QTDSDriver for creating new connections for internal +queries. This is to prevent the simultaneous usage of several +<a href="qsqlquery.html">QSqlQuery</a>/<a href="qsqlcursor.html">QSqlCursor</a> objects from blocking each other. +<p> <b>Warning:</b> The SQL framework takes ownership of the <em>driver</em> pointer, +and it should not be deleted. The returned QSqlDatabase object is +owned by the framework and must not be deleted. If you want to +explicitly remove the connection, use <a href="#removeDatabase">removeDatabase</a>() +<p> <p>See also <a href="#drivers">drivers</a>(). + +<h3 class=fn>void <a name="close"></a>QSqlDatabase::close () +</h3> +Closes the database connection, freeing any resources acquired. +<p> <p>See also <a href="#removeDatabase">removeDatabase</a>(). + +<h3 class=fn>bool <a name="commit"></a>QSqlDatabase::commit () +</h3> +Commits a transaction to the database if the driver supports +transactions. Returns TRUE if the operation succeeded; otherwise +returns FALSE. +<p> <p>See also <a href="qsqldriver.html#hasFeature">QSqlDriver::hasFeature</a>() and <a href="#rollback">rollback</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="connectOptions"></a>QSqlDatabase::connectOptions () const +</h3><p>Returns the database connect options. +See the <a href="qsqldatabase.html#connectOptions-prop">"connectOptions"</a> property for details. +<h3 class=fn>bool <a name="contains"></a>QSqlDatabase::contains ( const <a href="qstring.html">QString</a> & connectionName = defaultConnection )<tt> [static]</tt> +</h3> +Returns TRUE if the list of database connections contains <em>connectionName</em>; otherwise returns FALSE. + +<h3 class=fn><a href="qsqldatabase.html">QSqlDatabase</a> * <a name="database"></a>QSqlDatabase::database ( const <a href="qstring.html">QString</a> & connectionName = defaultConnection, bool open = TRUE )<tt> [static]</tt> +</h3> +Returns the database connection called <em>connectionName</em>. The +database connection must have been previously added with +<a href="#addDatabase">addDatabase</a>(). If <em>open</em> is TRUE (the default) and the database +connection is not already open it is opened now. If no <em>connectionName</em> is specified the default connection is used. If <em>connectionName</em> does not exist in the list of databases, 0 is +returned. The pointer returned is owned by QSqlDatabase and should +<em>not</em> be deleted. +<p> <b>Warning:</b> There are restrictions on the use of database connections +in threaded applications. Please see the <a href="threads.html#threads-sql">Thread Support in Qt</a> document for more information about +threading and SQL databases. + +<p>Examples: <a href="sql.html#x2156">sql/overview/basicbrowsing/main.cpp</a> and <a href="sql.html#x2155">sql/overview/create_connections/main.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="databaseName"></a>QSqlDatabase::databaseName () const +</h3><p>Returns the name of the database. +See the <a href="qsqldatabase.html#databaseName-prop">"databaseName"</a> property for details. +<h3 class=fn><a href="qsqldriver.html">QSqlDriver</a> * <a name="driver"></a>QSqlDatabase::driver () const +</h3> +Returns the database driver used to access the database +connection. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="driverName"></a>QSqlDatabase::driverName () const +</h3> +Returns the name of the driver used by the database connection. + +<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="drivers"></a>QSqlDatabase::drivers ()<tt> [static]</tt> +</h3> +Returns a list of all the available database drivers. +<p> Note that if you want to iterate over the list, you should iterate +over a copy, e.g. +<pre> + <a href="qstringlist.html">QStringList</a> list = QSqlDatabase::<a href="#drivers">drivers</a>(); + QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>(); + while( it != list.<a href="qvaluelist.html#end">end</a>() ) { + myProcessing( *it ); + ++it; + } + </pre> + + +<h3 class=fn><a href="qsqlquery.html">QSqlQuery</a> <a name="exec"></a>QSqlDatabase::exec ( const <a href="qstring.html">QString</a> & query = QString::null ) const +</h3> +Executes a SQL statement (e.g. an <tt>INSERT</tt>, <tt>UPDATE</tt> or <tt>DELETE</tt> statement) on the database, and returns a <a href="qsqlquery.html">QSqlQuery</a> object. +Use <a href="#lastError">lastError</a>() to retrieve error information. If <em>query</em> is +<a href="qstring.html#QString-null">QString::null</a>, an empty, invalid query is returned and lastError() +is not affected. +<p> <p>See also <a href="qsqlquery.html">QSqlQuery</a> and <a href="#lastError">lastError</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="hostName"></a>QSqlDatabase::hostName () const +</h3><p>Returns the host name where the database resides. +See the <a href="qsqldatabase.html#hostName-prop">"hostName"</a> property for details. +<h3 class=fn>bool <a name="isDriverAvailable"></a>QSqlDatabase::isDriverAvailable ( const <a href="qstring.html">QString</a> & name )<tt> [static]</tt> +</h3> +Returns TRUE if a driver called <em>name</em> is available; otherwise +returns FALSE. +<p> <p>See also <a href="#drivers">drivers</a>(). + +<h3 class=fn>bool <a name="isOpen"></a>QSqlDatabase::isOpen () const +</h3> +Returns TRUE if the database connection is currently open; +otherwise returns FALSE. + +<h3 class=fn>bool <a name="isOpenError"></a>QSqlDatabase::isOpenError () const +</h3> +Returns TRUE if there was an error opening the database +connection; otherwise returns FALSE. Error information can be +retrieved using the <a href="#lastError">lastError</a>() function. + +<h3 class=fn><a href="qsqlerror.html">QSqlError</a> <a name="lastError"></a>QSqlDatabase::lastError () const +</h3> +Returns information about the last error that occurred on the +database. See <a href="qsqlerror.html">QSqlError</a> for more information. + +<p>Examples: <a href="sql.html#x2148">sql/overview/connection.cpp</a> and <a href="sqltable-example.html#x2455">sql/sqltable/main.cpp</a>. +<h3 class=fn>bool <a name="open"></a>QSqlDatabase::open () +</h3> +Opens the database connection using the current connection values. +Returns TRUE on success; otherwise returns FALSE. Error +information can be retrieved using the <a href="#lastError">lastError</a>() function. +<p> <p>See also <a href="#lastError">lastError</a>(). + +<p>Examples: <a href="sql.html#x2142">sql/overview/connect1/main.cpp</a>, <a href="sql.html#x2149">sql/overview/connection.cpp</a>, and <a href="sqltable-example.html#x2456">sql/sqltable/main.cpp</a>. +<h3 class=fn>bool <a name="open-2"></a>QSqlDatabase::open ( const <a href="qstring.html">QString</a> & user, const <a href="qstring.html">QString</a> & password ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Opens the database connection using the given <em>user</em> name and <em>password</em>. Returns TRUE on success; otherwise returns FALSE. Error +information can be retrieved using the <a href="#lastError">lastError</a>() function. +<p> This function does not store the password it is given. Instead, +the password is passed directly to the driver for opening a +connection and is then discarded. +<p> <p>See also <a href="#lastError">lastError</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="password"></a>QSqlDatabase::password () const +</h3><p>Returns the password used to connect to the database. +See the <a href="qsqldatabase.html#password-prop">"password"</a> property for details. +<h3 class=fn>int <a name="port"></a>QSqlDatabase::port () const +</h3><p>Returns the port used to connect to the database. +See the <a href="qsqldatabase.html#port-prop">"port"</a> property for details. +<h3 class=fn><a href="qsqlindex.html">QSqlIndex</a> <a name="primaryIndex"></a>QSqlDatabase::primaryIndex ( const <a href="qstring.html">QString</a> & tablename ) const +</h3> +Returns the primary index for table <em>tablename</em>. If no primary +index exists an empty <a href="qsqlindex.html">QSqlIndex</a> will be returned. + +<h3 class=fn><a href="qsqlrecord.html">QSqlRecord</a> <a name="record"></a>QSqlDatabase::record ( const <a href="qstring.html">QString</a> & tablename ) const +</h3> +Returns a <a href="qsqlrecord.html">QSqlRecord</a> populated with the names of all the fields in +the table (or view) called <em>tablename</em>. The order in which the +fields appear in the record is undefined. If no such table (or +view) exists, an empty record is returned. +<p> <p>See also <a href="#recordInfo">recordInfo</a>(). + +<h3 class=fn><a href="qsqlrecord.html">QSqlRecord</a> <a name="record-2"></a>QSqlDatabase::record ( const <a href="qsqlquery.html">QSqlQuery</a> & query ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns a <a href="qsqlrecord.html">QSqlRecord</a> populated with the names of all the fields +used in the SQL <em>query</em>. If the query is a "SELECT *" the order +in which fields appear in the record is undefined. +<p> <p>See also <a href="#recordInfo">recordInfo</a>(). + +<h3 class=fn><a href="qsqlrecordinfo.html">QSqlRecordInfo</a> <a name="recordInfo"></a>QSqlDatabase::recordInfo ( const <a href="qstring.html">QString</a> & tablename ) const +</h3> +Returns a <a href="qsqlrecordinfo.html">QSqlRecordInfo</a> populated with meta data about the table +or view <em>tablename</em>. If no such table (or view) exists, an empty +record is returned. +<p> <p>See also <a href="qsqlrecordinfo.html">QSqlRecordInfo</a>, <a href="qsqlfieldinfo.html">QSqlFieldInfo</a>, and <a href="#record">record</a>(). + +<h3 class=fn><a href="qsqlrecordinfo.html">QSqlRecordInfo</a> <a name="recordInfo-2"></a>QSqlDatabase::recordInfo ( const <a href="qsqlquery.html">QSqlQuery</a> & query ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns a <a href="qsqlrecordinfo.html">QSqlRecordInfo</a> object with meta data for the <a href="qsqlquery.html">QSqlQuery</a> +<em>query</em>. Note that this overloaded function may return less +information than the <a href="#recordInfo">recordInfo</a>() function which takes the name of +a table as parameter. +<p> <p>See also <a href="qsqlrecordinfo.html">QSqlRecordInfo</a>, <a href="qsqlfieldinfo.html">QSqlFieldInfo</a>, and <a href="#record">record</a>(). + +<h3 class=fn>void <a name="registerSqlDriver"></a>QSqlDatabase::registerSqlDriver ( const <a href="qstring.html">QString</a> & name, const QSqlDriverCreatorBase * creator )<tt> [static]</tt> +</h3> +This function registers a new SQL driver called <em>name</em>, within +the SQL framework. This is useful if you have a custom SQL driver +and don't want to compile it as a plugin. +<p> Example usage: +<p> <pre> + QSqlDatabase::<a href="#registerSqlDriver">registerSqlDriver</a>( "MYDRIVER", new QSqlDriverCreator<MyDatabaseDriver> ); + QSqlDatabase* db = QSqlDatabase::<a href="#addDatabase">addDatabase</a>( "MYDRIVER" ); + ... + </pre> + +<p> <b>Warning:</b> The framework takes ownership of the <em>creator</em> pointer, +so it should not be deleted. + +<h3 class=fn>void <a name="removeDatabase"></a>QSqlDatabase::removeDatabase ( const <a href="qstring.html">QString</a> & connectionName )<tt> [static]</tt> +</h3> +Removes the database connection <em>connectionName</em> from the list of +database connections. +<p> <b>Warning:</b> There should be no open queries on the database +connection when this function is called, otherwise a resource leak +will occur. + +<h3 class=fn>void <a name="removeDatabase-2"></a>QSqlDatabase::removeDatabase ( <a href="qsqldatabase.html">QSqlDatabase</a> * db )<tt> [static]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Removes the database connection <em>db</em> from the list of database +connections. The QSqlDatabase object is destroyed when it is removed +from the list. +<p> <b>Warning:</b> The <em>db</em> pointer is not valid after this function has +been called. There should be no open queries on the database +connection when this function is called, otherwise a resource leak +will occur. + +<h3 class=fn>bool <a name="rollback"></a>QSqlDatabase::rollback () +</h3> +Rolls a transaction back on the database if the driver supports +transactions. Returns TRUE if the operation succeeded; otherwise +returns FALSE. +<p> <p>See also <a href="qsqldriver.html#hasFeature">QSqlDriver::hasFeature</a>(), <a href="#commit">commit</a>(), and <a href="#transaction">transaction</a>(). + +<h3 class=fn>void <a name="setConnectOptions"></a>QSqlDatabase::setConnectOptions ( const <a href="qstring.html">QString</a> & options = QString::null ) +</h3><p>Sets the database connect options to <em>options</em>. +See the <a href="qsqldatabase.html#connectOptions-prop">"connectOptions"</a> property for details. +<h3 class=fn>void <a name="setDatabaseName"></a>QSqlDatabase::setDatabaseName ( const <a href="qstring.html">QString</a> & name )<tt> [virtual]</tt> +</h3><p>Sets the name of the database to <em>name</em>. +See the <a href="qsqldatabase.html#databaseName-prop">"databaseName"</a> property for details. +<h3 class=fn>void <a name="setHostName"></a>QSqlDatabase::setHostName ( const <a href="qstring.html">QString</a> & host )<tt> [virtual]</tt> +</h3><p>Sets the host name where the database resides to <em>host</em>. +See the <a href="qsqldatabase.html#hostName-prop">"hostName"</a> property for details. +<h3 class=fn>void <a name="setPassword"></a>QSqlDatabase::setPassword ( const <a href="qstring.html">QString</a> & password )<tt> [virtual]</tt> +</h3><p>Sets the password used to connect to the database to <em>password</em>. +See the <a href="qsqldatabase.html#password-prop">"password"</a> property for details. +<h3 class=fn>void <a name="setPort"></a>QSqlDatabase::setPort ( int p )<tt> [virtual]</tt> +</h3><p>Sets the port used to connect to the database to <em>p</em>. +See the <a href="qsqldatabase.html#port-prop">"port"</a> property for details. +<h3 class=fn>void <a name="setUserName"></a>QSqlDatabase::setUserName ( const <a href="qstring.html">QString</a> & name )<tt> [virtual]</tt> +</h3><p>Sets the user name connected to the database to <em>name</em>. +See the <a href="qsqldatabase.html#userName-prop">"userName"</a> property for details. +<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="tables"></a>QSqlDatabase::tables ( <a href="qsql.html#TableType-enum">QSql::TableType</a> type ) const +</h3> +Returns a list of the database's tables, system tables and views, +as specified by the parameter <em>type</em>. +<p> Note that if you want to iterate over the list, you should iterate +over a copy, e.g. +<pre> + <a href="qstringlist.html">QStringList</a> list = myDatabase.tables( QSql::Tables | QSql::Views ); + QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>(); + while( it != list.<a href="qvaluelist.html#end">end</a>() ) { + myProcessing( *it ); + ++it; + } + </pre> + + +<p>Example: <a href="sqltable-example.html#x2461">sql/sqltable/main.cpp</a>. +<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="tables-2"></a>QSqlDatabase::tables () const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns a list of the database's tables that are visible to the +user. To include views or system tables, use the version of this +function that takes a table <tt>type</tt> parameter. +<p> Note that if you want to iterate over the list, you should iterate +over a copy, e.g. +<pre> + <a href="qstringlist.html">QStringList</a> list = myDatabase.tables(); + QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>(); + while( it != list.<a href="qvaluelist.html#end">end</a>() ) { + myProcessing( *it ); + ++it; + } + </pre> + + +<h3 class=fn>bool <a name="transaction"></a>QSqlDatabase::transaction () +</h3> +Begins a transaction on the database if the driver supports +transactions. Returns TRUE if the operation succeeded; otherwise +returns FALSE. +<p> <p>See also <a href="qsqldriver.html#hasFeature">QSqlDriver::hasFeature</a>(), <a href="#commit">commit</a>(), and <a href="#rollback">rollback</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="userName"></a>QSqlDatabase::userName () const +</h3><p>Returns the user name connected to the database. +See the <a href="qsqldatabase.html#userName-prop">"userName"</a> property for details. +<hr><h2>Property Documentation</h2> +<h3 class=fn><a href="qstring.html">QString</a> <a name="connectOptions-prop"></a>connectOptions</h3> +<p>This property holds the database connect options. +<p>The format of the options string is a semi-colon separated list of +option names or option = value pairs. The options depend on the +database client used: +<p> <center><table cellpadding="4" cellspacing="2" border="0"> +<tr bgcolor="#a2c511"> <th valign="top">ODBC <th valign="top">MySQL <th valign="top">PostgreSQL +<tr bgcolor="#f0f0f0"> +<p> <td valign="top"> +<ul> +<li> SQL_ATTR_ACCESS_MODE +<li> SQL_ATTR_LOGIN_TIMEOUT +<li> SQL_ATTR_CONNECTION_TIMEOUT +<li> SQL_ATTR_CURRENT_CATALOG +<li> SQL_ATTR_METADATA_ID +<li> SQL_ATTR_PACKET_SIZE +<li> SQL_ATTR_TRACEFILE +<li> SQL_ATTR_TRACE +</ul> +<p> <td valign="top"> +<ul> +<li> CLIENT_COMPRESS +<li> CLIENT_FOUND_ROWS +<li> CLIENT_IGNORE_SPACE +<li> CLIENT_SSL +<li> CLIENT_ODBC +<li> CLIENT_NO_SCHEMA +<li> CLIENT_INTERACTIVE +</ul> +<p> <td valign="top"> +<ul> +<li> connect_timeout +<li> options +<li> tty +<li> requiressl +<li> service +</ul> +<tr bgcolor="#a2c511"> <th valign="top">DB2 <th valign="top">OCI <th valign="top">TDS +<tr bgcolor="#d0d0d0"> +<p> <td valign="top"> +<ul> +<li> SQL_ATTR_ACCESS_MODE +<li> SQL_ATTR_LOGIN_TIMEOUT +</ul> +<p> <td valign="top"> +<em>none</em> +<p> <td valign="top"> +<em>none</em> +<p> </table></center> +<p> Example of usage: +<pre> + ... + // MySQL connection + db->setConnectOptions( "CLIENT_SSL;CLIENT_IGNORE_SPACE" ); // use an SSL connection to the server + if ( !db->open() ) { + db->setConnectOptions(); // clears the connect option string + ... + } + ... + // PostgreSQL connection + db->setConnectOptions( "requiressl=1" ); // enable PostgreSQL SSL connections + if ( !db->open() ) { + db->setConnectOptions(); // clear options + ... + } + ... + // ODBC connection + db->setConnectOptions( "SQL_ATTR_ACCESS_MODE=SQL_MODE_READ_ONLY;SQL_ATTR_TRACE=SQL_OPT_TRACE_ON" ); // set ODBC options + if ( !db->open() ) { + db->setConnectOptions(); // don't try to set this option + ... + } + </pre> + +<p> Please refer to the client library documentation for more +information about the different options. The options will be set +prior to opening the database connection. Setting new options +without re-opening the connection does nothing. +<p> <p>See also +<p>Set this property's value with <a href="#setConnectOptions">setConnectOptions</a>() and get this property's value with <a href="#connectOptions">connectOptions</a>(). +<h3 class=fn><a href="qstring.html">QString</a> <a name="databaseName-prop"></a>databaseName</h3> +<p>This property holds the name of the database. +<p>Note that the database name is the TNS Service Name for the <a href="sql-driver.html#QOCI8">QOCI8</a> +(Oracle) driver. +<p> For the <a href="sql-driver.html#QODBC3">QODBC3</a> driver it can either be a DSN, a DSN filename (the +file must have a <tt>.dsn</tt> extension), or a connection string. MS +Access users can for example use the following connection string +to open a <tt>.mdb</tt> file directly, instead of having to create a DSN +entry in the ODBC manager: +<p> <pre> + ... + db = QSqlDatabase::<a href="#addDatabase">addDatabase</a>( "QODBC3" ); + db->setDatabaseName( "DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=myaccessfile.mdb" ); + if ( db->open() ) { + // success! + } + ... + </pre> + +("FIL" is the required spelling in Microsoft's API.) +<p> There is no default value. + +<p>Set this property's value with <a href="#setDatabaseName">setDatabaseName</a>() and get this property's value with <a href="#databaseName">databaseName</a>(). +<h3 class=fn><a href="qstring.html">QString</a> <a name="hostName-prop"></a>hostName</h3> +<p>This property holds the host name where the database resides. +<p>There is no default value. + +<p>Set this property's value with <a href="#setHostName">setHostName</a>() and get this property's value with <a href="#hostName">hostName</a>(). +<h3 class=fn><a href="qstring.html">QString</a> <a name="password-prop"></a>password</h3> +<p>This property holds the password used to connect to the database. +<p>There is no default value. +<p> <b>Warning:</b> This function stores the password in plain text within +Qt. Use the <a href="#open">open</a>() call that takes a password as parameter to +avoid this behaviour. +<p> <p>See also <a href="#open">open</a>(). + +<p>Set this property's value with <a href="#setPassword">setPassword</a>() and get this property's value with <a href="#password">password</a>(). +<h3 class=fn>int <a name="port-prop"></a>port</h3> +<p>This property holds the port used to connect to the database. +<p>There is no default value. + +<p>Set this property's value with <a href="#setPort">setPort</a>() and get this property's value with <a href="#port">port</a>(). +<h3 class=fn><a href="qstring.html">QString</a> <a name="userName-prop"></a>userName</h3> +<p>This property holds the user name connected to the database. +<p>There is no default value. + +<p>Set this property's value with <a href="#setUserName">setUserName</a>() and get this property's value with <a href="#userName">userName</a>(). +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">Qt toolkit</a>. +Copyright © 1995-2007 +<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |