<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>bookwindow.cpp Example File | Qt SQL 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtsql-index.html">Qt SQL</a></td><td ><a href="qtsql-books-example.html">Books</a></td><td >bookwindow.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtsql-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">bookwindow.cpp Example File</h1> <span class="subtitle">books/bookwindow.cpp</span> <!-- $$$books/bookwindow.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the demonstration applications of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "bookwindow.h"</span> <span class="preprocessor">#include "bookdelegate.h"</span> <span class="preprocessor">#include "initdb.h"</span> <span class="preprocessor">#include <QtSql></span> BookWindow<span class="operator">::</span>BookWindow() { ui<span class="operator">.</span>setupUi(<span class="keyword">this</span>); <span class="keyword">if</span> (<span class="operator">!</span><span class="type"><a href="qsqldatabase.html">QSqlDatabase</a></span><span class="operator">::</span>drivers()<span class="operator">.</span>contains(<span class="string">"QSQLITE"</span>)) <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical( <span class="keyword">this</span><span class="operator">,</span> <span class="string">"Unable to load database"</span><span class="operator">,</span> <span class="string">"This demo needs the SQLITE driver"</span> ); <span class="comment">// Initialize the database:</span> <span class="type"><a href="qsqlerror.html">QSqlError</a></span> err <span class="operator">=</span> initDb(); <span class="keyword">if</span> (err<span class="operator">.</span>type() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qsqlerror.html">QSqlError</a></span><span class="operator">::</span>NoError) { showError(err); <span class="keyword">return</span>; } <span class="comment">// Create the data model:</span> model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a></span>(ui<span class="operator">.</span>bookTable); model<span class="operator">-</span><span class="operator">></span>setEditStrategy(<span class="type"><a href="qsqltablemodel.html">QSqlTableModel</a></span><span class="operator">::</span>OnManualSubmit); model<span class="operator">-</span><span class="operator">></span>setTable(<span class="string">"books"</span>); <span class="comment">// Remember the indexes of the columns:</span> authorIdx <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"author"</span>); genreIdx <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"genre"</span>); <span class="comment">// Set the relations to the other database tables:</span> model<span class="operator">-</span><span class="operator">></span>setRelation(authorIdx<span class="operator">,</span> <span class="type"><a href="qsqlrelation.html">QSqlRelation</a></span>(<span class="string">"authors"</span><span class="operator">,</span> <span class="string">"id"</span><span class="operator">,</span> <span class="string">"name"</span>)); model<span class="operator">-</span><span class="operator">></span>setRelation(genreIdx<span class="operator">,</span> <span class="type"><a href="qsqlrelation.html">QSqlRelation</a></span>(<span class="string">"genres"</span><span class="operator">,</span> <span class="string">"id"</span><span class="operator">,</span> <span class="string">"name"</span>)); <span class="comment">// Set the localized header captions:</span> model<span class="operator">-</span><span class="operator">></span>setHeaderData(authorIdx<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">"Author Name"</span>)); model<span class="operator">-</span><span class="operator">></span>setHeaderData(genreIdx<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">"Genre"</span>)); model<span class="operator">-</span><span class="operator">></span>setHeaderData(model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"title"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">"Title"</span>)); model<span class="operator">-</span><span class="operator">></span>setHeaderData(model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"year"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">"Year"</span>)); model<span class="operator">-</span><span class="operator">></span>setHeaderData(model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"rating"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">"Rating"</span>)); <span class="comment">// Populate the model:</span> <span class="keyword">if</span> (<span class="operator">!</span>model<span class="operator">-</span><span class="operator">></span>select()) { showError(model<span class="operator">-</span><span class="operator">></span>lastError()); <span class="keyword">return</span>; } <span class="comment">// Set the model and hide the ID column:</span> ui<span class="operator">.</span>bookTable<span class="operator">-</span><span class="operator">></span>setModel(model); ui<span class="operator">.</span>bookTable<span class="operator">-</span><span class="operator">></span>setItemDelegate(<span class="keyword">new</span> BookDelegate(ui<span class="operator">.</span>bookTable)); ui<span class="operator">.</span>bookTable<span class="operator">-</span><span class="operator">></span>setColumnHidden(model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"id"</span>)<span class="operator">,</span> <span class="keyword">true</span>); ui<span class="operator">.</span>bookTable<span class="operator">-</span><span class="operator">></span>setSelectionMode(<span class="type"><a href="../qtwidgets/qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>SingleSelection); <span class="comment">// Initialize the Author combo box:</span> ui<span class="operator">.</span>authorEdit<span class="operator">-</span><span class="operator">></span>setModel(model<span class="operator">-</span><span class="operator">></span>relationModel(authorIdx)); ui<span class="operator">.</span>authorEdit<span class="operator">-</span><span class="operator">></span>setModelColumn( model<span class="operator">-</span><span class="operator">></span>relationModel(authorIdx)<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"name"</span>)); ui<span class="operator">.</span>genreEdit<span class="operator">-</span><span class="operator">></span>setModel(model<span class="operator">-</span><span class="operator">></span>relationModel(genreIdx)); ui<span class="operator">.</span>genreEdit<span class="operator">-</span><span class="operator">></span>setModelColumn( model<span class="operator">-</span><span class="operator">></span>relationModel(genreIdx)<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"name"</span>)); <span class="comment">// Lock and prohibit resizing of the width of the rating column:</span> ui<span class="operator">.</span>bookTable<span class="operator">-</span><span class="operator">></span>horizontalHeader()<span class="operator">-</span><span class="operator">></span>setSectionResizeMode( model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"rating"</span>)<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qheaderview.html">QHeaderView</a></span><span class="operator">::</span>ResizeToContents); <span class="type"><a href="../qtwidgets/qdatawidgetmapper.html">QDataWidgetMapper</a></span> <span class="operator">*</span>mapper <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qdatawidgetmapper.html">QDataWidgetMapper</a></span>(<span class="keyword">this</span>); mapper<span class="operator">-</span><span class="operator">></span>setModel(model); mapper<span class="operator">-</span><span class="operator">></span>setItemDelegate(<span class="keyword">new</span> BookDelegate(<span class="keyword">this</span>)); mapper<span class="operator">-</span><span class="operator">></span>addMapping(ui<span class="operator">.</span>titleEdit<span class="operator">,</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"title"</span>)); mapper<span class="operator">-</span><span class="operator">></span>addMapping(ui<span class="operator">.</span>yearEdit<span class="operator">,</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"year"</span>)); mapper<span class="operator">-</span><span class="operator">></span>addMapping(ui<span class="operator">.</span>authorEdit<span class="operator">,</span> authorIdx); mapper<span class="operator">-</span><span class="operator">></span>addMapping(ui<span class="operator">.</span>genreEdit<span class="operator">,</span> genreIdx); mapper<span class="operator">-</span><span class="operator">></span>addMapping(ui<span class="operator">.</span>ratingEdit<span class="operator">,</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"rating"</span>)); connect(ui<span class="operator">.</span>bookTable<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>currentRowChanged<span class="operator">,</span> mapper<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qdatawidgetmapper.html">QDataWidgetMapper</a></span><span class="operator">::</span>setCurrentModelIndex ); ui<span class="operator">.</span>bookTable<span class="operator">-</span><span class="operator">></span>setCurrentIndex(model<span class="operator">-</span><span class="operator">></span>index(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)); createMenuBar(); } <span class="type">void</span> BookWindow<span class="operator">::</span>showError(<span class="keyword">const</span> <span class="type"><a href="qsqlerror.html">QSqlError</a></span> <span class="operator">&</span>err) { <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical(<span class="keyword">this</span><span class="operator">,</span> <span class="string">"Unable to initialize Database"</span><span class="operator">,</span> <span class="string">"Error initializing database: "</span> <span class="operator">+</span> err<span class="operator">.</span>text()); } <span class="type">void</span> BookWindow<span class="operator">::</span>createMenuBar() { <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>quitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"&Quit"</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>aboutAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"&About"</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>aboutQtAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"&About Qt"</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&File"</span>)); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(quitAction); <span class="type"><a href="../qtwidgets/qmenu.html">QMenu</a></span> <span class="operator">*</span>helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Help"</span>)); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutAction); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutQtAction); connect(quitAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>BookWindow<span class="operator">::</span>close); connect(aboutAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>BookWindow<span class="operator">::</span>about); connect(aboutQtAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <a href="../qtwidgets/qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span><span class="operator">::</span>aboutQt); } <span class="type">void</span> BookWindow<span class="operator">::</span>about() { <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About Books"</span>)<span class="operator">,</span> tr(<span class="string">"<p>The <b>Books</b> example shows how to use Qt SQL classes "</span> <span class="string">"with a model/view framework."</span>)); } </pre> </div> <!-- @@@books/bookwindow.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>