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39
40#ifndef QSQLQUERYMODEL_P_H
41#define QSQLQUERYMODEL_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of qsql*model.h . This header file may change from version to version
49// without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtSql/private/qtsqlglobal_p.h>
55#include "private/qabstractitemmodel_p.h"
56#include "QtSql/qsqlerror.h"
57#include "QtSql/qsqlquery.h"
58#include "QtSql/qsqlrecord.h"
59#include "QtCore/qhash.h"
60#include "QtCore/qvarlengtharray.h"
61#include "QtCore/qvector.h"
62
63QT_REQUIRE_CONFIG(sqlmodel);
64
65QT_BEGIN_NAMESPACE
66
67class QSqlQueryModelPrivate: public QAbstractItemModelPrivate
68{
69 Q_DECLARE_PUBLIC(QSqlQueryModel)
70public:
71 QSqlQueryModelPrivate() : atEnd(false), nestedResetLevel(0) {}
72 ~QSqlQueryModelPrivate();
73
74 void prefetch(int);
75 void initColOffsets(int size);
76 int columnInQuery(int modelColumn) const;
77
78 mutable QSqlQuery query = { QSqlQuery(nullptr) };
79 mutable QSqlError error;
80 QModelIndex bottom;
81 QSqlRecord rec;
82 uint atEnd : 1;
83 QVector<QHash<int, QVariant> > headers;
84 QVarLengthArray<int, 56> colOffsets; // used to calculate indexInQuery of columns
85 int nestedResetLevel;
86};
87
88// helpers for building SQL expressions
89class QSqlQueryModelSql
90{
91public:
92 // SQL keywords
93 inline const static QLatin1String as() { return QLatin1String("AS"); }
94 inline const static QLatin1String asc() { return QLatin1String("ASC"); }
95 inline const static QLatin1String comma() { return QLatin1String(","); }
96 inline const static QLatin1String desc() { return QLatin1String("DESC"); }
97 inline const static QLatin1String eq() { return QLatin1String("="); }
98 // "and" is a C++ keyword
99 inline const static QLatin1String et() { return QLatin1String("AND"); }
100 inline const static QLatin1String from() { return QLatin1String("FROM"); }
101 inline const static QLatin1String leftJoin() { return QLatin1String("LEFT JOIN"); }
102 inline const static QLatin1String on() { return QLatin1String("ON"); }
103 inline const static QLatin1String orderBy() { return QLatin1String("ORDER BY"); }
104 inline const static QLatin1String parenClose() { return QLatin1String(")"); }
105 inline const static QLatin1String parenOpen() { return QLatin1String("("); }
106 inline const static QLatin1String select() { return QLatin1String("SELECT"); }
107 inline const static QLatin1String sp() { return QLatin1String(" "); }
108 inline const static QLatin1String where() { return QLatin1String("WHERE"); }
109
110 // Build expressions based on key words
111 inline const static QString as(const QString &a, const QString &b) { return b.isEmpty() ? a : concat(a: concat(a, b: as()), b); }
112 inline const static QString asc(const QString &s) { return concat(a: s, b: asc()); }
113 inline const static QString comma(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : QString(a).append(s: comma()).append(s: b); }
114 inline const static QString concat(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : QString(a).append(s: sp()).append(s: b); }
115 inline const static QString desc(const QString &s) { return concat(a: s, b: desc()); }
116 inline const static QString eq(const QString &a, const QString &b) { return QString(a).append(s: eq()).append(s: b); }
117 inline const static QString et(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : concat(a: concat(a, b: et()), b); }
118 inline const static QString from(const QString &s) { return concat(a: from(), b: s); }
119 inline const static QString leftJoin(const QString &s) { return concat(a: leftJoin(), b: s); }
120 inline const static QString on(const QString &s) { return concat(a: on(), b: s); }
121 inline const static QString orderBy(const QString &s) { return s.isEmpty() ? s : concat(a: orderBy(), b: s); }
122 inline const static QString paren(const QString &s) { return s.isEmpty() ? s : parenOpen() + s + parenClose(); }
123 inline const static QString select(const QString &s) { return concat(a: select(), b: s); }
124 inline const static QString where(const QString &s) { return s.isEmpty() ? s : concat(a: where(), b: s); }
125};
126
127QT_END_NAMESPACE
128
129#endif // QSQLQUERYMODEL_P_H
130

source code of qtbase/src/sql/models/qsqlquerymodel_p.h