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39
40#ifndef QSQLNULLDRIVER_P_H
41#define QSQLNULLDRIVER_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. This header file may
48// change from version to version without notice, or even be
49// removed.
50//
51// We mean it.
52//
53
54#include <QtSql/private/qtsqlglobal_p.h>
55#include "QtCore/qvariant.h"
56#include "QtSql/qsqldriver.h"
57#include "QtSql/qsqlerror.h"
58#include "QtSql/qsqlresult.h"
59
60QT_BEGIN_NAMESPACE
61
62class QSqlNullResult : public QSqlResult
63{
64public:
65 inline explicit QSqlNullResult(const QSqlDriver* d): QSqlResult(d)
66 { QSqlResult::setLastError(
67 QSqlError(QLatin1String("Driver not loaded"), QLatin1String("Driver not loaded"), QSqlError::ConnectionError)); }
68protected:
69 inline QVariant data(int) override { return QVariant(); }
70 inline bool reset (const QString&) override { return false; }
71 inline bool fetch(int) override { return false; }
72 inline bool fetchFirst() override { return false; }
73 inline bool fetchLast() override { return false; }
74 inline bool isNull(int) override { return false; }
75 inline int size() override { return -1; }
76 inline int numRowsAffected() override { return 0; }
77
78 inline void setAt(int) override {}
79 inline void setActive(bool) override {}
80 inline void setLastError(const QSqlError&) override {}
81 inline void setQuery(const QString&) override {}
82 inline void setSelect(bool) override {}
83 inline void setForwardOnly(bool) override {}
84
85 inline bool exec() override { return false; }
86 inline bool prepare(const QString&) override { return false; }
87 inline bool savePrepare(const QString&) override { return false; }
88 inline void bindValue(int, const QVariant&, QSql::ParamType) override {}
89 inline void bindValue(const QString&, const QVariant&, QSql::ParamType) override {}
90};
91
92class QSqlNullDriver : public QSqlDriver
93{
94public:
95 inline QSqlNullDriver(): QSqlDriver()
96 { QSqlDriver::setLastError(
97 QSqlError(QLatin1String("Driver not loaded"), QLatin1String("Driver not loaded"), QSqlError::ConnectionError)); }
98 inline bool hasFeature(DriverFeature) const override { return false; }
99 inline bool open(const QString &, const QString &, const QString &, const QString &, int, const QString&) override
100 { return false; }
101 inline void close() override {}
102 inline QSqlResult *createResult() const override { return new QSqlNullResult(this); }
103
104protected:
105 inline void setOpen(bool) override {}
106 inline void setOpenError(bool) override {}
107 inline void setLastError(const QSqlError&) override {}
108};
109
110QT_END_NAMESPACE
111
112#endif // QSQLNULLDRIVER_P_H
113

source code of qtbase/src/sql/kernel/qsqlnulldriver_p.h