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/****************************************************************************
**
** Implementation of SQLite driver classes.
**
** Copyright (C) 1992-2003 Trolltech AS. All rights reserved.
**
** This file is part of the sql module of the Qt GUI Toolkit.
** EDITIONS: FREE, ENTERPRISE
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include "qsql_sqlite3.h"
#include <qdatetime.h>
#include <qvaluevector.h>
#include <qregexp.h>
#include <qfile.h>
#include <sqlite3.h>
#if (QT_VERSION-0 < 0x030200)
# include <qvector.h>
# if !defined Q_WS_WIN32
# include <unistd.h>
# endif
#else
# include <qptrvector.h>
# if !defined Q_WS_WIN32
# include <unistd.h>
# endif
#endif
typedef struct sqlite3_stmt sqlite3_stmt;
#define QSQLITE3_DRIVER_NAME "QSQLITE3"
static QVariant::Type qSqliteType(int tp)
{
switch (tp) {
case SQLITE_INTEGER:
return QVariant::Int;
case SQLITE_FLOAT:
return QVariant::Double;
case SQLITE_BLOB:
return QVariant::ByteArray;
case SQLITE_TEXT:
default:
return QVariant::String;
}
}
static QSqlError qMakeError(sqlite3 *access, const QString &descr, QSqlError::Type type,
int errorCode = -1)
{
return QSqlError(descr,
QString::fromUtf8(sqlite3_errmsg(access)),
type, errorCode);
}
class QSQLite3DriverPrivate
{
public:
QSQLite3DriverPrivate();
sqlite3 *access;
bool utf8;
};
QSQLite3DriverPrivate::QSQLite3DriverPrivate() : access(0)
{
utf8 = true;
}
class QSQLite3ResultPrivate
{
public:
QSQLite3ResultPrivate(QSQLite3Result *res);
void cleanup();
bool fetchNext(QSqlCachedResult::ValueCache &values, int idx, bool initialFetch);
bool isSelect();
// initializes the recordInfo and the cache
void initColumns();
void finalize();
QSQLite3Result* q;
sqlite3 *access;
sqlite3_stmt *stmt;
uint skippedStatus: 1; // the status of the fetchNext() that's skipped
uint skipRow: 1; // skip the next fetchNext()?
uint utf8: 1;
QSqlRecord rInf;
};
static const uint initial_cache_size = 128;
QSQLite3ResultPrivate::QSQLite3ResultPrivate(QSQLite3Result* res) : q(res), access(0),
stmt(0), skippedStatus(false), skipRow(false), utf8(false)
{
}
void QSQLite3ResultPrivate::cleanup()
{
finalize();
rInf.clear();
skippedStatus = false;
skipRow = false;
q->setAt(QSql::BeforeFirst);
q->setActive(false);
q->cleanup();
}
void QSQLite3ResultPrivate::finalize()
{
if (!stmt)
return;
sqlite3_finalize(stmt);
stmt = 0;
}
// called on first fetch
void QSQLite3ResultPrivate::initColumns()
{
rInf.clear();
int nCols = sqlite3_column_count(stmt);
if (nCols <= 0)
return;
q->init(nCols);
for (int i = 0; i < nCols; ++i) {
QString colName = QString::fromUtf8(sqlite3_column_name(stmt, i));
int dotIdx = colName.findRev('.');
rInf.append(QSqlField(colName.mid(dotIdx == -1 ? 0 : dotIdx + 1),
qSqliteType(sqlite3_column_type(stmt, i))));
}
}
bool QSQLite3ResultPrivate::fetchNext(QSqlCachedResult::ValueCache &values, int idx, bool initialFetch)
{
int res;
unsigned int i;
if (skipRow) {
// already fetched
Q_ASSERT(!initialFetch);
skipRow = false;
return skippedStatus;
}
skipRow = initialFetch;
if (!stmt)
return false;
// keep trying while busy, wish I could implement this better.
while ((res = sqlite3_step(stmt)) == SQLITE_BUSY) {
// sleep instead requesting result again immidiately.
#if defined Q_OS_WIN
Sleep(1000);
#else
sleep(1);
#endif
}
switch(res) {
case SQLITE_ROW:
// check to see if should fill out columns
if (rInf.isEmpty())
// must be first call.
initColumns();
if (idx < 0 && !initialFetch)
return true;
for (i = 0; i < rInf.count(); ++i)
// todo - handle other types
values[i + idx] = QString::fromUtf8((char *)(sqlite3_column_text(stmt, i)));
// values[i + idx] = utf8 ? QString::fromUtf8(fvals[i]) : QString::fromAscii(fvals[i]);
return true;
case SQLITE_DONE:
if (rInf.isEmpty())
// must be first call.
initColumns();
q->setAt(QSql::AfterLast);
return false;
case SQLITE_ERROR:
case SQLITE_MISUSE:
default:
// something wrong, don't get col info, but still return false
q->setLastError(qMakeError(access, "Unable to fetch row", QSqlError::Connection, res));
finalize();
q->setAt(QSql::AfterLast);
return false;
}
return false;
}
QSQLite3Result::QSQLite3Result(const QSQLite3Driver* db)
: QSqlCachedResult(db)
{
d = new QSQLite3ResultPrivate(this);
d->access = db->d->access;
}
QSQLite3Result::~QSQLite3Result()
{
d->cleanup();
delete d;
}
/*
Execute \a query.
*/
bool QSQLite3Result::reset (const QString &query)
{
// this is where we build a query.
if (!driver() || !driver()->isOpen() || driver()->isOpenError())
return false;
d->cleanup();
setSelect(false);
int res = sqlite3_prepare(d->access, query.utf8().data(), (query.length() + 1) * sizeof(QChar),
&d->stmt, 0);
if (res != SQLITE_OK) {
setLastError(qMakeError(d->access, "Unable to execute statement", QSqlError::Statement, res));
d->finalize();
return false;
}
d->skippedStatus = d->fetchNext(cache(), 0, true);
setSelect(!d->rInf.isEmpty());
setActive(true);
return true;
}
bool QSQLite3Result::gotoNext(QSqlCachedResult::ValueCache& row, int idx)
{
return d->fetchNext(row, idx, false);
}
int QSQLite3Result::size()
{
return -1;
}
int QSQLite3Result::numRowsAffected()
{
return sqlite3_changes(d->access);
}
/////////////////////////////////////////////////////////
QSQLite3Driver::QSQLite3Driver(QObject * parent, const char *name)
: QSqlDriver(parent, name)
{
d = new QSQLite3DriverPrivate();
}
QSQLite3Driver::QSQLite3Driver(sqlite3 *connection, QObject *parent, const char *name)
: QSqlDriver(parent, name)
{
d = new QSQLite3DriverPrivate();
d->access = connection;
setOpen(true);
setOpenError(false);
}
QSQLite3Driver::~QSQLite3Driver()
{
delete d;
}
bool QSQLite3Driver::hasFeature(DriverFeature f) const
{
switch (f) {
case Transactions:
case Unicode:
case BLOB:
return true;
default:
break;
}
return false;
}
/*
SQLite dbs have no user name, passwords, hosts or ports.
just file names.
*/
bool QSQLite3Driver::open(const QString & db, const QString &, const QString &, const QString &, int, const QString &)
{
if (isOpen())
close();
if (db.isEmpty())
return false;
if (sqlite3_open(QFile::encodeName(db), &d->access) == SQLITE_OK) {
setOpen(true);
setOpenError(false);
return true;
} else {
setLastError(qMakeError(d->access, "Error opening database",
QSqlError::Connection));
setOpenError(true);
return false;
}
}
void QSQLite3Driver::close()
{
if (isOpen()) {
if (sqlite3_close(d->access) != SQLITE_OK)
setLastError(qMakeError(d->access, "Error closing database",
QSqlError::Connection));
d->access = 0;
setOpen(false);
setOpenError(false);
}
}
QSqlQuery QSQLite3Driver::createQuery() const
{
return QSqlQuery(new QSQLite3Result(this));
}
bool QSQLite3Driver::beginTransaction()
{
if (!isOpen() || isOpenError())
return false;
QSqlQuery q(createQuery());
if (!q.exec("BEGIN")) {
setLastError(QSqlError("Unable to begin transaction",
q.lastError().databaseText(), QSqlError::Transaction));
return false;
}
return true;
}
bool QSQLite3Driver::commitTransaction()
{
if (!isOpen() || isOpenError())
return false;
QSqlQuery q(createQuery());
if (!q.exec("COMMIT")) {
setLastError(QSqlError("Unable to begin transaction",
q.lastError().databaseText(), QSqlError::Transaction));
return false;
}
return true;
}
bool QSQLite3Driver::rollbackTransaction()
{
if (!isOpen() || isOpenError())
return false;
QSqlQuery q(createQuery());
if (!q.exec("ROLLBACK")) {
setLastError(QSqlError("Unable to begin transaction",
q.lastError().databaseText(), QSqlError::Transaction));
return false;
}
return true;
}
QStringList QSQLite3Driver::tables(const QString &typeName) const
{
QStringList res;
if (!isOpen())
return res;
int type = typeName.toInt();
QSqlQuery q = createQuery();
q.setForwardOnly(TRUE);
#if (QT_VERSION-0 >= 0x030200)
if ((type & (int)QSql::Tables) && (type & (int)QSql::Views))
q.exec("SELECT name FROM sqlite_master WHERE type='table' OR type='view'");
else if (typeName.isEmpty() || (type & (int)QSql::Tables))
q.exec("SELECT name FROM sqlite_master WHERE type='table'");
else if (type & (int)QSql::Views)
q.exec("SELECT name FROM sqlite_master WHERE type='view'");
#else
q.exec("SELECT name FROM sqlite_master WHERE type='table' OR type='view'");
#endif
if (q.isActive()) {
while(q.next())
res.append(q.value(0).toString());
}
#if (QT_VERSION-0 >= 0x030200)
if (type & (int)QSql::SystemTables) {
// there are no internal tables beside this one:
res.append("sqlite_master");
}
#endif
return res;
}
QSqlIndex QSQLite3Driver::primaryIndex(const QString &tblname) const
{
QSqlRecordInfo rec(recordInfo(tblname)); // expensive :(
if (!isOpen())
return QSqlIndex();
QSqlQuery q = createQuery();
q.setForwardOnly(TRUE);
// finrst find a UNIQUE INDEX
q.exec("PRAGMA index_list('" + tblname + "');");
QString indexname;
while(q.next()) {
if (q.value(2).toInt()==1) {
indexname = q.value(1).toString();
break;
}
}
if (indexname.isEmpty())
return QSqlIndex();
q.exec("PRAGMA index_info('" + indexname + "');");
QSqlIndex index(indexname);
while(q.next()) {
QString name = q.value(2).toString();
QSqlVariant::Type type = QSqlVariant::Invalid;
if (rec.contains(name))
type = rec.find(name).type();
index.append(QSqlField(name, type));
}
return index;
}
QSqlRecordInfo QSQLite3Driver::recordInfo(const QString &tbl) const
{
if (!isOpen())
return QSqlRecordInfo();
QSqlQuery q = createQuery();
q.setForwardOnly(TRUE);
q.exec("SELECT * FROM " + tbl + " LIMIT 1");
return recordInfo(q);
}
QSqlRecord QSQLite3Driver::record(const QString &tblname) const
{
if (!isOpen())
return QSqlRecord();
return recordInfo(tblname).toRecord();
}
QSqlRecord QSQLite3Driver::record(const QSqlQuery& query) const
{
if (query.isActive() && query.driver() == this) {
QSQLite3Result* result = (QSQLite3Result*)query.result();
return result->d->rInf;
}
return QSqlRecord();
}
QSqlRecordInfo QSQLite3Driver::recordInfo(const QSqlQuery& query) const
{
if (query.isActive() && query.driver() == this) {
QSQLite3Result* result = (QSQLite3Result*)query.result();
return QSqlRecordInfo(result->d->rInf);
}
return QSqlRecordInfo();
}
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