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