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<pre> /****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
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** This file is part of the demonstration applications of the Qt Toolkit.
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#include "bookwindow.h"
#include "bookdelegate.h"
#include "initdb.h"
#include <QtSql>
BookWindow::BookWindow()
{
ui.setupUi(this);
if (!QSqlDatabase::drivers().contains("QSQLITE"))
QMessageBox::critical(this, "Unable to load database", "This demo needs the SQLITE driver");
<span class="comment">// initialize the database</span>
QSqlError err = initDb();
if (err.type() != QSqlError::NoError) {
showError(err);
return;
}
<span class="comment">// Create the data model</span>
model = new QSqlRelationalTableModel(ui.bookTable);
model->setEditStrategy(QSqlTableModel::OnManualSubmit);
model->setTable("books");
<span class="comment">// Remeber the indexes of the columns</span>
authorIdx = model->fieldIndex("author");
genreIdx = model->fieldIndex("genre");
<span class="comment">// Set the relations to the other database tables</span>
model->setRelation(authorIdx, QSqlRelation("authors", "id", "name"));
model->setRelation(genreIdx, QSqlRelation("genres", "id", "name"));
<span class="comment">// Set the localized header captions</span>
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"));
<span class="comment">// Populate the model</span>
if (!model->select()) {
showError(model->lastError());
return;
}
<span class="comment">// Set the model and hide the ID column</span>
ui.bookTable->setModel(model);
ui.bookTable->setItemDelegate(new BookDelegate(ui.bookTable));
ui.bookTable->setColumnHidden(model->fieldIndex("id"), true);
<span class="comment">// Initialize the Author combo box</span>
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)
{
QMessageBox::critical(this, "Unable to initialize Database",
"Error initializing database: " + err.text());
}</pre>
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