Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

window.cpp Example File
sql/sqlwidgetmapper/window.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** 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 [email protected].
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtGui>
 #include <QtSql>

 #include "window.h"

 Window::Window(QWidget *parent)
     : QWidget(parent)
 {
     setupModel();

     nameLabel = new QLabel(tr("Na&me:"));
     nameEdit = new QLineEdit();
     addressLabel = new QLabel(tr("&Address:"));
     addressEdit = new QTextEdit();
     typeLabel = new QLabel(tr("&Type:"));
     typeComboBox = new QComboBox();
     nextButton = new QPushButton(tr("&Next"));
     previousButton = new QPushButton(tr("&Previous"));

     nameLabel->setBuddy(nameEdit);
     addressLabel->setBuddy(addressEdit);
     typeLabel->setBuddy(typeComboBox);

     QSqlTableModel *relModel = model->relationModel(typeIndex);
     typeComboBox->setModel(relModel);
     typeComboBox->setModelColumn(relModel->fieldIndex("description"));

     mapper = new QDataWidgetMapper(this);
     mapper->setModel(model);
     mapper->setItemDelegate(new QSqlRelationalDelegate(this));
     mapper->addMapping(nameEdit, model->fieldIndex("name"));
     mapper->addMapping(addressEdit, model->fieldIndex("address"));
     mapper->addMapping(typeComboBox, typeIndex);

     connect(previousButton, SIGNAL(clicked()),
             mapper, SLOT(toPrevious()));
     connect(nextButton, SIGNAL(clicked()),
             mapper, SLOT(toNext()));
     connect(mapper, SIGNAL(currentIndexChanged(int)),
             this, SLOT(updateButtons(int)));

     QGridLayout *layout = new QGridLayout();
     layout->addWidget(nameLabel, 0, 0, 1, 1);
     layout->addWidget(nameEdit, 0, 1, 1, 1);
     layout->addWidget(previousButton, 0, 2, 1, 1);
     layout->addWidget(addressLabel, 1, 0, 1, 1);
     layout->addWidget(addressEdit, 1, 1, 2, 1);
     layout->addWidget(nextButton, 1, 2, 1, 1);
     layout->addWidget(typeLabel, 3, 0, 1, 1);
     layout->addWidget(typeComboBox, 3, 1, 1, 1);
     setLayout(layout);

     setWindowTitle(tr("SQL Widget Mapper"));
     mapper->toFirst();
 }

 void Window::setupModel()
 {
     QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
     db.setDatabaseName(":memory:");
     if (!db.open()) {
         QMessageBox::critical(0, tr("Cannot open database"),
             tr("Unable to establish a database connection.\n"
                "This example needs SQLite support. Please read "
                "the Qt SQL driver documentation for information how "
                "to build it."), QMessageBox::Cancel);
         return;
     }

     QSqlQuery query;
     query.exec("create table person (id int primary key, "
                "name varchar(20), address varchar(200), typeid int)");
     query.exec("insert into person values(1, 'Alice', "
                "'<qt>123 Main Street<br/>Market Town</qt>', 101)");
     query.exec("insert into person values(2, 'Bob', "
                "'<qt>PO Box 32<br/>Mail Handling Service"
                "<br/>Service City</qt>', 102)");
     query.exec("insert into person values(3, 'Carol', "
                "'<qt>The Lighthouse<br/>Remote Island</qt>', 103)");
     query.exec("insert into person values(4, 'Donald', "
                "'<qt>47338 Park Avenue<br/>Big City</qt>', 101)");
     query.exec("insert into person values(5, 'Emma', "
                "'<qt>Research Station<br/>Base Camp<br/>"
                "Big Mountain</qt>', 103)");

     query.exec("create table addresstype (id int, description varchar(20))");
     query.exec("insert into addresstype values(101, 'Home')");
     query.exec("insert into addresstype values(102, 'Work')");
     query.exec("insert into addresstype values(103, 'Other')");

     model = new QSqlRelationalTableModel(this);
     model->setTable("person");
     model->setEditStrategy(QSqlTableModel::OnManualSubmit);

     typeIndex = model->fieldIndex("typeid");

     model->setRelation(typeIndex,
            QSqlRelation("addresstype", "id", "description"));
     model->select();
 }

 void Window::updateButtons(int row)
 {
     previousButton->setEnabled(row > 0);
     nextButton->setEnabled(row < model->rowCount() - 1);
 }