Qt Reference Documentation

bookwindow.cpp Example File

 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 ** This file is part of the demonstration applications of the Qt Toolkit.
 ** No Commercial Usage
 ** This file contains pre-release code and may not be distributed.
 ** You may use this file in accordance with the terms and conditions
 ** contained in the Technology Preview License Agreement accompanying
 ** this package.
 ** 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
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 #include "bookwindow.h"
 #include "bookdelegate.h"
 #include "initdb.h"

 #include <QtSql>


     if (!QSqlDatabase::drivers().contains("QSQLITE"))
         QMessageBox::critical(this, "Unable to load database", "This demo needs the SQLITE driver");

     // initialize the database
     QSqlError err = initDb();
     if (err.type() != QSqlError::NoError) {

     // Create the data model
     model = new QSqlRelationalTableModel(ui.bookTable);

     // Remember the indexes of the columns
     authorIdx = model->fieldIndex("author");
     genreIdx = model->fieldIndex("genre");

     // Set the relations to the other database tables
     model->setRelation(authorIdx, QSqlRelation("authors", "id", "name"));
     model->setRelation(genreIdx, QSqlRelation("genres", "id", "name"));

     // Set the localized header captions
     model->setHeaderData(authorIdx, Qt::Horizontal, tr("Author Name"));
     model->setHeaderData(genreIdx, Qt::Horizontal, tr("Genre"));
     model->setHeaderData(model->fieldIndex("title"), Qt::Horizontal, tr("Title"));
     model->setHeaderData(model->fieldIndex("year"), Qt::Horizontal, tr("Year"));
     model->setHeaderData(model->fieldIndex("rating"), Qt::Horizontal, tr("Rating"));

     // Populate the model
     if (!model->select()) {

     // Set the model and hide the ID column
     ui.bookTable->setItemDelegate(new BookDelegate(ui.bookTable));
     ui.bookTable->setColumnHidden(model->fieldIndex("id"), true);

     // Initialize the Author combo box


     QDataWidgetMapper *mapper = new QDataWidgetMapper(this);
     mapper->setItemDelegate(new BookDelegate(this));
     mapper->addMapping(ui.titleEdit, model->fieldIndex("title"));
     mapper->addMapping(ui.yearEdit, model->fieldIndex("year"));
     mapper->addMapping(ui.authorEdit, authorIdx);
     mapper->addMapping(ui.genreEdit, genreIdx);
     mapper->addMapping(ui.ratingEdit, model->fieldIndex("rating"));

     connect(ui.bookTable->selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
             mapper, SLOT(setCurrentModelIndex(QModelIndex)));

     ui.bookTable->setCurrentIndex(model->index(0, 0));

 void BookWindow::showError(const QSqlError &err)
     QMessageBox::critical(this, "Unable to initialize Database",
                 "Error initializing database: " + err.text());

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