qsqlcachedresult.h

Trolltech公司发布的基于C++图形开发环境

/****************************************************************************
**
** Definition of shared Qt SQL module classes
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** This file is part of the sql module of the Qt GUI Toolkit.
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#ifndef QSQLCACHEDRESULT_H
#define QSQLCACHEDRESULT_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
//

#include <qglobal.h>
#include <qvariant.h>
#include <qptrvector.h>
#include <qvaluevector.h>
#include <qsqlresult.h>

#if !defined( QT_MODULE_SQL ) || defined( QT_LICENSE_PROFESSIONAL )
#define QM_EXPORT_SQL
#else
#define QM_EXPORT_SQL Q_EXPORT
#endif

#ifndef QT_NO_SQL

class QtSqlCachedResultPrivate;

class QM_EXPORT_SQL QtSqlCachedResult: public QSqlResult
{
public:
    virtual ~QtSqlCachedResult();

    typedef QValueVector<QVariant> RowCache;
    typedef QPtrVector<RowCache> RowsetCache;

protected:    
    QtSqlCachedResult(const QSqlDriver * db);

    void init(int colCount);
    void cleanup();
    bool cacheNext();

    virtual bool gotoNext(RowCache* row) = 0;

    QVariant data(int i);
    bool isNull(int i);
    bool fetch(int i);
    bool fetchNext();
    bool fetchPrev();
    bool fetchFirst();
    bool fetchLast();

    int colCount() const;

private:
    QtSqlCachedResultPrivate *d;
};


#endif

#endif