/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtSql module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 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 GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#ifndef QSQLRELATIONALTABLEMODEL_H#define QSQLRELATIONALTABLEMODEL_H#include <QtSql/qsqltablemodel.h>QT_BEGIN_HEADERQT_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_OBJECTpublic:    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_HEADER#endif // QSQLRELATIONALTABLEMODEL_H