Qt 4.8: relationaltablemodel.cpp Example File (sql/relationaltablemodel/relationaltablemodel.cpp)

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# relationaltablemodel.cpp Example File

sql/relationaltablemodel/relationaltablemodel.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
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     **   * Redistributions of source code must retain the above copyright
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     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
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     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     #include <QtGui>
     #include <QtSql>

     #include "../connection.h"

     void initializeModel(QSqlRelationalTableModel *model)
     {
         model->setTable("employee");

         model->setEditStrategy(QSqlTableModel::OnManualSubmit);
         model->setRelation(2, QSqlRelation("city", "id", "name"));
         model->setRelation(3, QSqlRelation("country", "id", "name"));

         model->setHeaderData(0, Qt::Horizontal, QObject::tr("ID"));
         model->setHeaderData(1, Qt::Horizontal, QObject::tr("Name"));
         model->setHeaderData(2, Qt::Horizontal, QObject::tr("City"));
         model->setHeaderData(3, Qt::Horizontal, QObject::tr("Country"));

         model->select();
     }

     QTableView *createView(const QString &title, QSqlTableModel *model)
     {
         QTableView *view = new QTableView;
         view->setModel(model);
         view->setItemDelegate(new QSqlRelationalDelegate(view));
         view->setWindowTitle(title);
         return view;
     }

     void createRelationalTables()
     {
         QSqlQuery query;
         query.exec("create table employee(id int primary key, name varchar(20), city int, country int)");
         query.exec("insert into employee values(1, 'Espen', 5000, 47)");
         query.exec("insert into employee values(2, 'Harald', 80000, 49)");
         query.exec("insert into employee values(3, 'Sam', 100, 1)");

         query.exec("create table city(id int, name varchar(20))");
         query.exec("insert into city values(100, 'San Jose')");
         query.exec("insert into city values(5000, 'Oslo')");
         query.exec("insert into city values(80000, 'Munich')");

         query.exec("create table country(id int, name varchar(20))");
         query.exec("insert into country values(1, 'USA')");
         query.exec("insert into country values(47, 'Norway')");
         query.exec("insert into country values(49, 'Germany')");
     }

     int main(int argc, char *argv[])
     {
         QApplication app(argc, argv);
         if (!createConnection())
             return 1;
         createRelationalTables();

         QSqlRelationalTableModel model;

         initializeModel(&model);

         QTableView *view = createView(QObject::tr("Relational Table Model"), &model);
     #if defined(Q_OS_SYMBIAN)
         view->showMaximized();
     #else
         view->show();
     #endif

         return app.exec();
     }