Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtSql module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSQLRELATIONALTABLEMODEL_H
+#define QSQLRELATIONALTABLEMODEL_H
+
+#include <QtSql/qsqltablemodel.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Sql)
+
+class Q_SQL_EXPORT QSqlRelation
+{
+public:
+    QSqlRelation() {}
+    QSqlRelation(const QString &aTableName, const QString &indexCol,
+               const QString &displayCol)
+        : tName(aTableName), iColumn(indexCol), dColumn(displayCol) {}
+    inline QString tableName() const
+    { return tName; }
+    inline QString indexColumn() const
+    { return iColumn; }
+    inline QString displayColumn() const
+    { return dColumn; }
+    inline bool isValid() const
+    { return !(tName.isEmpty() || iColumn.isEmpty() || dColumn.isEmpty()); }
+private:
+    QString tName, iColumn, dColumn;
+};
+
+class QSqlRelationalTableModelPrivate;
+
+class Q_SQL_EXPORT QSqlRelationalTableModel: public QSqlTableModel
+{
+    Q_OBJECT
+
+public:
+    explicit QSqlRelationalTableModel(QObject *parent = 0,
+                                      QSqlDatabase db = QSqlDatabase());
+    virtual ~QSqlRelationalTableModel();
+
+    QVariant data(const QModelIndex &item, int role = Qt::DisplayRole) const;
+    bool setData(const QModelIndex &item, const QVariant &value, int role = Qt::EditRole);
+    bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex());
+
+    void clear();
+    bool select();
+
+    void setTable(const QString &tableName);
+    virtual void setRelation(int column, const QSqlRelation &relation);
+    QSqlRelation relation(int column) const;
+    virtual QSqlTableModel *relationModel(int column) const;
+
+public Q_SLOTS:
+    void revertRow(int row);
+
+protected:
+    QString selectStatement() const;
+    bool updateRowInTable(int row, const QSqlRecord &values);
+    bool insertRowIntoTable(const QSqlRecord &values);
+    QString orderByClause() const;
+
+private:
+    Q_DECLARE_PRIVATE(QSqlRelationalTableModel)
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QSQLRELATIONALTABLEMODEL_H