/****************************************************************************
**
** Copyright (C) 1992-2004 Trolltech AS. All rights reserved.
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** This file is part of the sql module of the Qt Toolkit.
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** LICENSE.QPL included in the packaging of this file.
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** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
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**   information about Qt Commercial License Agreements.
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** See http://www.trolltech.com/gpl/ for GPL licensing information.
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#ifndef QSQLRELATIONALTABLEMODEL_H
#define QSQLRELATIONALTABLEMODEL_H

#include <qsqltablemodel.h>

class Q_SQL_EXPORT QSqlRelation
{
public:
    QSqlRelation() {}
    QSqlRelation(const QString &tableName, const QString &indexColumn,
               const QString &displayColumn)
        : tName(tableName), iColumn(indexColumn), dColumn(displayColumn) {}
    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_DECLARE_PRIVATE(QSqlRelationalTableModel)

public:
    QSqlRelationalTableModel(QObject *parent = 0, QSqlDatabase db = QSqlDatabase());
    virtual ~QSqlRelationalTableModel();

    QVariant data(const QModelIndex &item, int role = DisplayRole) const;
    bool setData(const QModelIndex &item, const QVariant &value, int role = EditRole);

    void clear();
    bool select();

    virtual void setRelation(int column, const QSqlRelation &relation);
    QSqlRelation relation(int column) const;
    virtual QSqlTableModel *relationModel(int column) const;

public slots:
    void revertRow(int row);

protected:
    QString selectStatement() const;
};

#endif
