bookwindow.cpp Example File

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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" ); // 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"); // 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()) { 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); ui.bookTable->setSelectionMode(QAbstractItemView::SingleSelection); // 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")); // Lock and prohibit resizing of the width of the rating column: ui.bookTable->horizontalHeader()->setSectionResizeMode( model->fieldIndex("rating"), QHeaderView::ResizeToContents); 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(), &QItemSelectionModel::currentRowChanged, mapper, &QDataWidgetMapper::setCurrentModelIndex ); ui.bookTable->setCurrentIndex(model->index(0, 0)); createMenuBar(); } void BookWindow::showError(const QSqlError &err) { QMessageBox::critical(this, "Unable to initialize Database", "Error initializing database: " + err.text()); } void BookWindow::createMenuBar() { QAction *quitAction = new QAction(tr("&Quit"), this); QAction *aboutAction = new QAction(tr("&About"), this); QAction *aboutQtAction = new QAction(tr("&About Qt"), this); QMenu *fileMenu = menuBar()->addMenu(tr("&File")); fileMenu->addAction(quitAction); QMenu *helpMenu = menuBar()->addMenu(tr("&Help")); helpMenu->addAction(aboutAction); helpMenu->addAction(aboutQtAction); connect(quitAction, &QAction::triggered, this, &BookWindow::close); connect(aboutAction, &QAction::triggered, this, &BookWindow::about); connect(aboutQtAction, &QAction::triggered, qApp, &QApplication::aboutQt); } void BookWindow::about() { QMessageBox::about(this, tr("About Books"), tr("<p>The <b>Books</b> example shows how to use Qt SQL classes " "with a model/view framework.")); }

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