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# bookwindow.cpp Example File
demos/books/bookwindow.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the demonstration applications of the Qt Toolkit.
        **
        ** Licensees holding valid Qt Preview licenses may use this file in
        ** accordance with the Qt Preview License Agreement provided with the
        ** Software.
        **
        ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
        ** information about Qt Commercial License Agreements.
        **
        ** Contact info@trolltech.com if any conditions of this licensing are
        ** not clear to you.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include "bookwindow.h"
        #include "bookdelegate.h"
        #include "initdb.h"

        #include <QtSql>

        BookWindow::BookWindow()
        {
            ui.setupUi(this);

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

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

            // Create the data model
            model = new QSqlRelationalTableModel(ui.bookTable);
            model->setEditStrategy(QSqlTableModel::OnManualSubmit);
            model->setTable("books");

            // Remeber 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()) {
                showError(model->lastError());
                return;
            }

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

            // Initialize the Author combo box
            ui.authorEdit->setModel(model->relationModel(authorIdx));
            ui.authorEdit->setModelColumn(model->relationModel(authorIdx)->fieldIndex("name"));

            ui.genreEdit->setModel(model->relationModel(genreIdx));
            ui.genreEdit->setModelColumn(model->relationModel(genreIdx)->fieldIndex("name"));

            QDataWidgetMapper *mapper = new QDataWidgetMapper(this);
            mapper->setModel(model);
            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)
        {
            QMessageBoxEx::critical(this, "Unable to initialize Database",
                        "Error initializing database: " + err.text());
        }