/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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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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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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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 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL 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 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QSQLRELATIONALTABLEMODEL_H+
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#define QSQLRELATIONALTABLEMODEL_H+
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+
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#include <QtSql/qsqltablemodel.h>+
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+
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QT_BEGIN_HEADER+
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+
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QT_BEGIN_NAMESPACE+
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+
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QT_MODULE(Sql)+
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+
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class Q_SQL_EXPORT QSqlRelation+
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{+
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public:+
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    QSqlRelation() {}+
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    QSqlRelation(const QString &aTableName, const QString &indexCol,+
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               const QString &displayCol)+
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        : tName(aTableName), iColumn(indexCol), dColumn(displayCol) {}+
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    inline QString tableName() const+
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    { return tName; }+
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    inline QString indexColumn() const+
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    { return iColumn; }+
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    inline QString displayColumn() const+
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    { return dColumn; }+
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    inline bool isValid() const+
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    { return !(tName.isEmpty() || iColumn.isEmpty() || dColumn.isEmpty()); }+
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private:+
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    QString tName, iColumn, dColumn;+
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};+
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+
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class QSqlRelationalTableModelPrivate;+
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+
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class Q_SQL_EXPORT QSqlRelationalTableModel: public QSqlTableModel+
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{+
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    Q_OBJECT+
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+
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public:+
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    explicit QSqlRelationalTableModel(QObject *parent = 0,+
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                                      QSqlDatabase db = QSqlDatabase());+
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    virtual ~QSqlRelationalTableModel();+
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+
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    QVariant data(const QModelIndex &item, int role = Qt::DisplayRole) const;+
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    bool setData(const QModelIndex &item, const QVariant &value, int role = Qt::EditRole);+
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    bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex());+
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+
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    void clear();+
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    bool select();+
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+
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    void setTable(const QString &tableName);+
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    virtual void setRelation(int column, const QSqlRelation &relation);+
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    QSqlRelation relation(int column) const;+
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    virtual QSqlTableModel *relationModel(int column) const;+
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+
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public Q_SLOTS:+
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    void revertRow(int row);+
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+
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protected:+
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    QString selectStatement() const;+
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    bool updateRowInTable(int row, const QSqlRecord &values);+
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    bool insertRowIntoTable(const QSqlRecord &values);+
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    QString orderByClause() const;+
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+
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private:+
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    Q_DECLARE_PRIVATE(QSqlRelationalTableModel)+
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};+
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+
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QT_END_NAMESPACE+
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+
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QT_END_HEADER+
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+
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#endif // QSQLRELATIONALTABLEMODEL_H+
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