qsqlnulldriver_p.h

奇趣公司比较新的qt/emd版本

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#ifndef QSQLNULLDRIVER_P_H
#define QSQLNULLDRIVER_P_H

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

#include "QtCore/qvariant.h"
#include "QtSql/qsqldriver.h"
#include "QtSql/qsqlerror.h"
#include "QtSql/qsqlresult.h"

class QSqlNullResult : public QSqlResult
{
public:
    inline explicit QSqlNullResult(const QSqlDriver* d): QSqlResult(d)
    { QSqlResult::setLastError(
            QSqlError(QLatin1String("Driver not loaded"), QLatin1String("Driver not loaded"))); }
protected:
    inline QVariant data(int) { return QVariant(); }
    inline bool reset (const QString&) { return false; }
    inline bool fetch(int) { return false; }
    inline bool fetchFirst() { return false; }
    inline bool fetchLast() { return false; }
    inline bool isNull(int) { return false; }
    inline int size()  { return -1; }
    inline int numRowsAffected() { return 0; }

    inline void setAt(int) {}
    inline void setActive(bool) {}
    inline void setLastError(const QSqlError&) {}
    inline void setQuery(const QString&) {}
    inline void setSelect(bool) {}
    inline void setForwardOnly(bool) {}

    inline bool exec() { return false; }
    inline bool prepare(const QString&) { return false; }
    inline bool savePrepare(const QString&) { return false; }
    inline void bindValue(int, const QVariant&, QSql::ParamType) {}
    inline void bindValue(const QString&, const QVariant&, QSql::ParamType) {}
};

class QSqlNullDriver : public QSqlDriver
{
public:
    inline QSqlNullDriver(): QSqlDriver()
    { QSqlDriver::setLastError(
            QSqlError(QLatin1String("Driver not loaded"), QLatin1String("Driver not loaded"))); }
    inline bool hasFeature(DriverFeature) const { return false; }
    inline bool open(const QString &, const QString & , const QString & ,
              const QString &, int, const QString&)
    { return false; }
    inline void close() {}
    inline QSqlResult *createResult() const { return new QSqlNullResult(this); }

protected:
    inline void setOpen(bool) {}
    inline void setOpenError(bool) {}
    inline void setLastError(const QSqlError&) {}
};

#endif // QSQLNULLDRIVER_P_H