qsqldriver.h

/****************************************************************************
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the QtSql module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.1, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef QSQLDRIVER_H
#define QSQLDRIVER_H

#include <QtCore/qobject.h>
#include <QtCore/qstring.h>
#include <QtSql/qsql.h>
#ifdef QT3_SUPPORT
#include <QtSql/qsqlquery.h>
#endif

QT_BEGIN_HEADER

QT_MODULE(Sql)

class QStringList;
class QSqlDatabase;
class QSqlDriverPrivate;
class QSqlError;
class QSqlField;
class QSqlIndex;
class QSqlRecord;
class QSqlResult;
class QVariant;

00068 class Q_SQL_EXPORT QSqlDriver : public QObject
{
    friend class QSqlDatabase;
    Q_OBJECT
    Q_DECLARE_PRIVATE(QSqlDriver)

public:
00075     enum DriverFeature { Transactions, QuerySize, BLOB, Unicode, PreparedQueries,
                         NamedPlaceholders, PositionalPlaceholders, LastInsertId,
                         BatchOperations, SimpleLocking, LowPrecisionNumbers };

00079     enum StatementType { WhereStatement, SelectStatement, UpdateStatement,
                         InsertStatement, DeleteStatement };

00082     enum IdentifierType { FieldName, TableName };

    explicit QSqlDriver(QObject *parent=0);
    ~QSqlDriver();
    virtual bool isOpen() const;
    bool isOpenError() const;

    virtual bool beginTransaction();
    virtual bool commitTransaction();
    virtual bool rollbackTransaction();
    virtual QStringList tables(QSql::TableType tableType) const;
    virtual QSqlIndex primaryIndex(const QString &tableName) const;
    virtual QSqlRecord record(const QString &tableName) const;
#ifdef QT3_SUPPORT
    inline QT3_SUPPORT QSqlRecord record(const QSqlQuery& query) const
    { return query.record(); }
    inline QT3_SUPPORT QSqlRecord recordInfo(const QString& tablename) const
    { return record(tablename); }
    inline QT3_SUPPORT QSqlRecord recordInfo(const QSqlQuery& query) const
    { return query.record(); }
    inline QT3_SUPPORT QString nullText() const { return QLatin1String("NULL"); }
    inline QT3_SUPPORT QString formatValue(const QSqlField *field, bool trimStrings = false) const
    { return field ? formatValue(*field, trimStrings) : QString(); }
#endif
    virtual QString formatValue(const QSqlField& field, bool trimStrings = false) const;

    virtual QString escapeIdentifier(const QString &identifier, IdentifierType type) const;
    virtual QString sqlStatement(StatementType type, const QString &tableName,
                                 const QSqlRecord &rec, bool preparedStatement) const;

    QSqlError lastError() const;

    virtual QVariant handle() const;
    virtual bool hasFeature(DriverFeature f) const = 0;
    virtual void close() = 0;
    virtual QSqlResult *createResult() const = 0;

    virtual bool open(const QString& db,
                      const QString& user = QString(),
                      const QString& password = QString(),
                      const QString& host = QString(),
                      int port = -1,
                      const QString& connOpts = QString()) = 0;
protected:
    virtual void setOpen(bool o);
    virtual void setOpenError(bool e);
    virtual void setLastError(const QSqlError& e);

private:
    Q_DISABLE_COPY(QSqlDriver)
};

QT_END_HEADER

#endif // QSQLDRIVER_H