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    41 

    42 #ifndef QSQLNULLDRIVER_P_H

    43 #define QSQLNULLDRIVER_P_H

    44 

    45 //

    46 //  W A R N I N G

    47 //  -------------

    48 //

    49 // This file is not part of the Qt API.  This header file may

    50 // change from version to version without notice, or even be

    51 // removed.

    52 //

    53 // We mean it.

    54 //

    55 

    56 #include "QtCore/qvariant.h"

    57 #include "QtSql/qsqldriver.h"

    58 #include "QtSql/qsqlerror.h"

    59 #include "QtSql/qsqlresult.h"

    60 

    61 QT_BEGIN_NAMESPACE

    62 

    63 class QSqlNullResult : public QSqlResult

    64 {

    65 public:

    66     inline explicit QSqlNullResult(const QSqlDriver* d): QSqlResult(d)

    67     { QSqlResult::setLastError(

    68             QSqlError(QLatin1String("Driver not loaded"), QLatin1String("Driver not loaded"), QSqlError::ConnectionError)); }

    69 protected:

    70     inline QVariant data(int) { return QVariant(); }

    71     inline bool reset (const QString&) { return false; }

    72     inline bool fetch(int) { return false; }

    73     inline bool fetchFirst() { return false; }

    74     inline bool fetchLast() { return false; }

    75     inline bool isNull(int) { return false; }

    76     inline int size()  { return -1; }

    77     inline int numRowsAffected() { return 0; }

    78 

    79     inline void setAt(int) {}

    80     inline void setActive(bool) {}

    81     inline void setLastError(const QSqlError&) {}

    82     inline void setQuery(const QString&) {}

    83     inline void setSelect(bool) {}

    84     inline void setForwardOnly(bool) {}

    85 

    86     inline bool exec() { return false; }

    87     inline bool prepare(const QString&) { return false; }

    88     inline bool savePrepare(const QString&) { return false; }

    89     inline void bindValue(int, const QVariant&, QSql::ParamType) {}

    90     inline void bindValue(const QString&, const QVariant&, QSql::ParamType) {}

    91 };

    92 

    93 class QSqlNullDriver : public QSqlDriver

    94 {

    95 public:

    96     inline QSqlNullDriver(): QSqlDriver()

    97     { QSqlDriver::setLastError(

    98             QSqlError(QLatin1String("Driver not loaded"), QLatin1String("Driver not loaded"), QSqlError::ConnectionError)); }

    99     inline bool hasFeature(DriverFeature) const { return false; }

   100     inline bool open(const QString &, const QString & , const QString & ,

   101               const QString &, int, const QString&)

   102     { return false; }

   103     inline void close() {}

   104     inline QSqlResult *createResult() const { return new QSqlNullResult(this); }

   105 

   106 protected:

   107     inline void setOpen(bool) {}

   108     inline void setOpenError(bool) {}

   109     inline void setLastError(const QSqlError&) {}

   110 };

   111 

   112 QT_END_NAMESPACE

   113 

   114 #endif // QSQLNULLDRIVER_P_H