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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtSql module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSQLQUERYMODEL_P_H
#define QSQLQUERYMODEL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of qsql*model.h . This header file may change from version to version
// without notice, or even be removed.
//
// We mean it.
//
#include <QtSql/private/qtsqlglobal_p.h>
#include "private/qabstractitemmodel_p.h"
#include "QtSql/qsqlerror.h"
#include "QtSql/qsqlquery.h"
#include "QtSql/qsqlrecord.h"
#include "QtCore/qhash.h"
#include "QtCore/qvarlengtharray.h"
#include "QtCore/qvector.h"
QT_REQUIRE_CONFIG(sqlmodel);
QT_BEGIN_NAMESPACE
class QSqlQueryModelPrivate: public QAbstractItemModelPrivate
{
Q_DECLARE_PUBLIC(QSqlQueryModel)
public:
QSqlQueryModelPrivate() : atEnd(false), nestedResetLevel(0) {}
~QSqlQueryModelPrivate();
void prefetch(int);
void initColOffsets(int size);
int columnInQuery(int modelColumn) const;
mutable QSqlQuery query = { QSqlQuery(nullptr) };
mutable QSqlError error;
QModelIndex bottom;
QSqlRecord rec;
uint atEnd : 1;
QVector<QHash<int, QVariant> > headers;
QVarLengthArray<int, 56> colOffsets; // used to calculate indexInQuery of columns
int nestedResetLevel;
};
// helpers for building SQL expressions
class QSqlQueryModelSql
{
public:
// SQL keywords
inline const static QLatin1String as() { return QLatin1String("AS"); }
inline const static QLatin1String asc() { return QLatin1String("ASC"); }
inline const static QLatin1String comma() { return QLatin1String(","); }
inline const static QLatin1String desc() { return QLatin1String("DESC"); }
inline const static QLatin1String eq() { return QLatin1String("="); }
// "and" is a C++ keyword
inline const static QLatin1String et() { return QLatin1String("AND"); }
inline const static QLatin1String from() { return QLatin1String("FROM"); }
inline const static QLatin1String leftJoin() { return QLatin1String("LEFT JOIN"); }
inline const static QLatin1String on() { return QLatin1String("ON"); }
inline const static QLatin1String orderBy() { return QLatin1String("ORDER BY"); }
inline const static QLatin1String parenClose() { return QLatin1String(")"); }
inline const static QLatin1String parenOpen() { return QLatin1String("("); }
inline const static QLatin1String select() { return QLatin1String("SELECT"); }
inline const static QLatin1String sp() { return QLatin1String(" "); }
inline const static QLatin1String where() { return QLatin1String("WHERE"); }
// Build expressions based on key words
inline const static QString as(const QString &a, const QString &b) { return b.isEmpty() ? a : concat(concat(a, as()), b); }
inline const static QString asc(const QString &s) { return concat(s, asc()); }
inline const static QString comma(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : QString(a).append(comma()).append(b); }
inline const static QString concat(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : QString(a).append(sp()).append(b); }
inline const static QString desc(const QString &s) { return concat(s, desc()); }
inline const static QString eq(const QString &a, const QString &b) { return QString(a).append(eq()).append(b); }
inline const static QString et(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : concat(concat(a, et()), b); }
inline const static QString from(const QString &s) { return concat(from(), s); }
inline const static QString leftJoin(const QString &s) { return concat(leftJoin(), s); }
inline const static QString on(const QString &s) { return concat(on(), s); }
inline const static QString orderBy(const QString &s) { return s.isEmpty() ? s : concat(orderBy(), s); }
inline const static QString paren(const QString &s) { return s.isEmpty() ? s : parenOpen() + s + parenClose(); }
inline const static QString select(const QString &s) { return concat(select(), s); }
inline const static QString where(const QString &s) { return s.isEmpty() ? s : concat(where(), s); }
};
QT_END_NAMESPACE
#endif // QSQLQUERYMODEL_P_H
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