QStringList QSqlDatabase::drivers(){    QStringList list;#ifdef QT_SQL_PSQL    list << QLatin1String("QPSQL7");    list << QLatin1String("QPSQL");#endif#ifdef QT_SQL_MYSQL    list << QLatin1String("QMYSQL3");    list << QLatin1String("QMYSQL");#endif#ifdef QT_SQL_ODBC    list << QLatin1String("QODBC3");    list << QLatin1String("QODBC");#endif#ifdef QT_SQL_OCI    list << QLatin1String("QOCI8");    list << QLatin1String("QOCI");#endif#ifdef QT_SQL_TDS    list << QLatin1String("QTDS7");    list << QLatin1String("QTDS");#endif#ifdef QT_SQL_DB2    list << QLatin1String("QDB2");#endif#ifdef QT_SQL_SQLITE    list << QLatin1String("QSQLITE");#endif#ifdef QT_SQL_SQLITE2    list << QLatin1String("QSQLITE2");#endif#ifdef QT_SQL_IBASE    list << QLatin1String("QIBASE");#endif#ifndef QT_NO_LIBRARY    if (QFactoryLoader *fl = loader()) {        QStringList keys = fl->keys();        for (QStringList::const_iterator i = keys.constBegin(); i != keys.constEnd(); ++i) {            if (!list.contains(*i))                list << *i;        }    }#endif    DriverDict dict = QSqlDatabasePrivate::driverDict();    for (DriverDict::const_iterator i = dict.constBegin(); i != dict.constEnd(); ++i) {        if (!list.contains(i.key()))            list << i.key();    }    return list;}/*!    This function registers a new SQL driver called \a name, within    the SQL framework. This is useful if you have a custom SQL driver    and don't want to compile it as a plugin.    Example:    \code    QSqlDatabase::registerSqlDriver("MYDRIVER",                                    new QSqlDriverCreator<MyDatabaseDriver>);    QSqlDatabase db = QSqlDatabase::addDatabase("MYDRIVER");    \endcode    QSqlDatabase takes ownership of the \a creator pointer, so you    mustn't delete it yourself.    \sa drivers()*/void QSqlDatabase::registerSqlDriver(const QString& name, QSqlDriverCreatorBase *creator){    delete QSqlDatabasePrivate::driverDict().take(name);    if (creator)        QSqlDatabasePrivate::driverDict().insert(name, creator);}/*!    \threadsafe    Returns true if the list of database connections contains \a    connectionName; otherwise returns false.    \sa connectionNames(), database()*/bool QSqlDatabase::contains(const QString& connectionName){    return QSqlDatabasePrivate::dbDict()->contains_ts(connectionName);}/*!    \threadsafe    Returns a list containing the names of all connections.    \sa contains(), database()*/QStringList QSqlDatabase::connectionNames(){    return QSqlDatabasePrivate::dbDict()->keys_ts();}/*!    \overload    Creates a QSqlDatabase connection that uses the driver referred    to by \a type. If the \a type is not recognized, the database    connection will have no functionality.    The currently available driver types are:    \table    \header \i Driver Type \i Description    \row \i QDB2     \i IBM DB2    \row \i QIBASE   \i Borland InterBase Driver    \row \i QMYSQL   \i MySQL Driver    \row \i QOCI     \i Oracle Call Interface Driver    \row \i QODBC    \i ODBC Driver (includes Microsoft SQL Server)    \row \i QPSQL    \i PostgreSQL Driver    \row \i QSQLITE  \i SQLite version 3 or above    \row \i QSQLITE2 \i SQLite version 2    \row \i QTDS     \i Sybase Adaptive Server    \endtable    Additional third party drivers, including your own custom    drivers, can be loaded dynamically.    \sa {SQL Database Drivers}, registerSqlDriver(), drivers()*/QSqlDatabase::QSqlDatabase(const QString &type){    d = new QSqlDatabasePrivate();    d->init(type);}/*!    \overload    Creates a database connection using the given \a driver.*/QSqlDatabase::QSqlDatabase(QSqlDriver *driver){    d = new QSqlDatabasePrivate(driver);}/*!    Creates an empty, invalid QSqlDatabase object. Use addDatabase(),    removeDatabase(), and database() to get valid QSqlDatabase    objects.*/QSqlDatabase::QSqlDatabase(){    d = QSqlDatabasePrivate::shared_null();    d->ref.ref();}/*!    Creates a copy of \a other.*/QSqlDatabase::QSqlDatabase(const QSqlDatabase &other){    d = other.d;    d->ref.ref();}/*!    Assigns \a other to this object.*/QSqlDatabase &QSqlDatabase::operator=(const QSqlDatabase &other){    qAtomicAssign(d, other.d);    return *this;}/*!    \internal    Create the actual driver instance \a type.*/void QSqlDatabasePrivate::init(const QString &type){    drvName = type;    if (!driver) {#ifdef QT_SQL_PSQL        if (type == QLatin1String("QPSQL") || type == QLatin1String("QPSQL7"))            driver = new QPSQLDriver();#endif#ifdef QT_SQL_MYSQL        if (type == QLatin1String("QMYSQL") || type == QLatin1String("QMYSQL3"))            driver = new QMYSQLDriver();#endif#ifdef QT_SQL_ODBC        if (type == QLatin1String("QODBC") || type == QLatin1String("QODBC3"))            driver = new QODBCDriver();#endif#ifdef QT_SQL_OCI        if (type == QLatin1String("QOCI") || type == QLatin1String("QOCI8"))            driver = new QOCIDriver();#endif#ifdef QT_SQL_TDS        if (type == QLatin1String("QTDS") || type == QLatin1String("QTDS7"))            driver = new QTDSDriver();#endif#ifdef QT_SQL_DB2        if (type == QLatin1String("QDB2"))            driver = new QDB2Driver();#endif#ifdef QT_SQL_SQLITE        if (type == QLatin1String("QSQLITE"))            driver = new QSQLiteDriver();#endif#ifdef QT_SQL_SQLITE2        if (type == QLatin1String("QSQLITE2"))            driver = new QSQLite2Driver();#endif#ifdef QT_SQL_IBASE        if (type == QLatin1String("QIBASE"))            driver = new QIBaseDriver();#endif    }    if (!driver) {        DriverDict dict = QSqlDatabasePrivate::driverDict();        for (DriverDict::const_iterator it = dict.constBegin();             it != dict.constEnd() && !driver; ++it) {            if (type == it.key()) {                driver = ((QSqlDriverCreatorBase*)(*it))->createObject();            }        }    }#ifndef QT_NO_LIBRARY    if (!driver && loader()) {        if (QSqlDriverFactoryInterface *factory = qobject_cast<QSqlDriverFactoryInterface*>(loader()->instance(type)))            driver = factory->create(type);    }#endif // QT_NO_LIBRARY    if (!driver) {        qWarning("QSqlDatabase: %s driver not loaded", type.toLatin1().data());        qWarning("QSqlDatabase: available drivers: %s",                        QSqlDatabase::drivers().join(QLatin1String(" ")).toLatin1().data());        driver = shared_null()->driver;    }}/*!    Destroys the object and frees any allocated resources.    If this is the last QSqlDatabase object that uses a certain    database connection, the is automatically closed.    \sa close()*/QSqlDatabase::~QSqlDatabase(){    if (!d->ref.deref()) {        close();        delete d;    }}/*!    Executes a SQL statement on the database and returns a QSqlQuery    object. Use lastError() to retrieve error information. If \a    query is empty, an empty, invalid query is returned and    lastError() is not affected.    \sa QSqlQuery, lastError()*/QSqlQuery QSqlDatabase::exec(const QString & query) const{    QSqlQuery r(d->driver->createResult());    if (!query.isEmpty()) {        r.exec(query);        d->driver->setLastError(r.lastError());    }    return r;}/*!    Opens the database connection using the current connection    values. Returns true on success; otherwise returns false. Error    information can be retrieved using lastError().    \sa lastError() setDatabaseName() setUserName() setPassword() setHostName() setPort() setConnectOptions()*/bool QSqlDatabase::open(){    return d->driver->open(d->dbname, d->uname, d->pword, d->hname,                            d->port, d->connOptions);}/*!    \overload    Opens the database connection using the given \a user name and \a    password. Returns true on success; otherwise returns false. Error    information can be retrieved using the lastError() function.    This function does not store the password it is given. Instead,    the password is passed directly to the driver for opening the    connection and it is then discarded.    \sa lastError()*/bool QSqlDatabase::open(const QString& user, const QString& password){    setUserName(user);    return d->driver->open(d->dbname, user, password, d->hname,                            d->port, d->connOptions);}/*!    Closes the database connection, freeing any resources acquired.    This will also affect copies of this QSqlDatabase object.    \sa removeDatabase()*/void QSqlDatabase::close(){    d->driver->close();}/*!    Returns true if the database connection is currently open;    otherwise returns false.*/bool QSqlDatabase::isOpen() const{    return d->driver->isOpen();}/*!    Returns true if there was an error opening the database    connection; otherwise returns false. Error information can be    retrieved using the lastError() function.*/bool QSqlDatabase::isOpenError() const{    return d->driver->isOpenError();}/*!    Begins a transaction on the database if the driver supports    transactions. Returns true if the operation succeeded; otherwise    returns false.    \sa QSqlDriver::hasFeature(), commit(), rollback()*/bool QSqlDatabase::transaction(){    if (!d->driver->hasFeature(QSqlDriver::Transactions))        return false;    return d->driver->beginTransaction();}/*!    Commits a transaction to the database if the driver supports    transactions and a transaction() has been started. Returns true if    the operation succeeded; otherwise returns false.    Note that on some databases, this function will not work if there    is an active QSqlQuery on the database. Use the lastError()    function to retrieve database-specific error data about the error    that occurred.    \sa QSqlDriver::hasFeature() rollback()*/bool QSqlDatabase::commit(){    if (!d->driver->hasFeature(QSqlDriver::Transactions))        return false;    return d->driver->commitTransaction();}/*!    Rolls a transaction back on the database if the driver supports    transactions and a transaction() has been started. Returns true    if the operation succeeded; otherwise returns false.    \sa QSqlDriver::hasFeature() commit()*/bool QSqlDatabase::rollback(){    if (!d->driver->hasFeature(QSqlDriver::Transactions))        return false;    return d->driver->rollbackTransaction();}/*!    Sets the connection's name to \a name. This must be done before    the connection is opened or it has no effect; (or you can close()    the connection, call this function and open() the connection    again). The name is database-specific.    For the QOCI (Oracle) driver, the database name is the TNS    Service Name.    For the QODBC driver, the \a name can either be a DSN, a DSN    filename (in which case the file must have a \c .dsn extension),    or a connection string.    For example, Microsoft Access users can use the following    connection string to open an \c .mdb file directly, instead of    having to create a DSN entry in the ODBC manager:    \code    ...    db = QSqlDatabase::addDatabase("QODBC");    db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=myaccessfile.mdb");    if (db.open()) {        // success!    }    ...    \endcode    There is no default value.    \sa databaseName() setUserName() setPassword() setHostName() setPort() setConnectOptions() open()*/void QSqlDatabase::setDatabaseName(const QString& name){    if (isValid())        d->dbname = name;}/*!    Sets the connection's user name to \a name. This must be done    before the connection is opened or it has no effect (or you can    close() the connection, call this function and open() the    connection again).    There is no default value.    \sa userName() setDatabaseName() setPassword() setHostName()    setPort() setConnectOptions() open()*/void QSqlDatabase::setUserName(const QString& name){    if (isValid())        d->uname = name;}/*!    Sets the connection's password to \a password. This must be done    before the connection is opened or it has no effect (or you can    close() the connection, call this function and open() the    connection again).    There is no default value.    \warning This function stores the password in plain text within    Qt. Use the open() call that takes a password as parameter to    avoid this behavior.    \sa password() setUserName() setDatabaseName() setHostName() setPort() setConnectOptions() open()*/void QSqlDatabase::setPassword(const QString& password){    if (isValid())        d->pword = password;}/*!    Sets the connection's host name to \a host. This must be done    before the connection is opened or it has no effect (or you can