<?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>sqlconversationmodel.cpp Example File | Qt Quick Controls 2 5.11</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 ><a href="../qtdoc/index.html">Qt 5.11</a></td><td ><a href="qtquickcontrols2-index.html">Qt Quick Controls 2</a></td><td ><a href="qtquickcontrols2-chattutorial-example.html">Qt Quick Controls 2 - Chat Tutorial</a></td><td >sqlconversationmodel.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.11.2 Reference Documentation</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">sqlconversationmodel.cpp Example File</h1> <span class="subtitle">chattutorial/chapter4-models/sqlconversationmodel.cpp</span> <!-- $$$chattutorial/chapter4-models/sqlconversationmodel.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples 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 "sqlconversationmodel.h"</span> <span class="preprocessor">#include <QDateTime></span> <span class="preprocessor">#include <QDebug></span> <span class="preprocessor">#include <QSqlError></span> <span class="preprocessor">#include <QSqlRecord></span> <span class="preprocessor">#include <QSqlQuery></span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>conversationsTableName <span class="operator">=</span> <span class="string">"Conversations"</span>; <span class="keyword">static</span> <span class="type">void</span> createTable() { <span class="keyword">if</span> (<span class="type"><a href="../qtsql/qsqldatabase.html">QSqlDatabase</a></span><span class="operator">::</span>database()<span class="operator">.</span>tables()<span class="operator">.</span>contains(conversationsTableName)) { <span class="comment">// The table already exists; we don't need to do anything.</span> <span class="keyword">return</span>; } <span class="type"><a href="../qtsql/qsqlquery.html">QSqlQuery</a></span> query; <span class="keyword">if</span> (<span class="operator">!</span>query<span class="operator">.</span>exec( <span class="string">"CREATE TABLE IF NOT EXISTS 'Conversations' ("</span> <span class="string">"'author' TEXT NOT NULL,"</span> <span class="string">"'recipient' TEXT NOT NULL,"</span> <span class="string">"'timestamp' TEXT NOT NULL,"</span> <span class="string">"'message' TEXT NOT NULL,"</span> <span class="string">"FOREIGN KEY('author') REFERENCES Contacts ( name ),"</span> <span class="string">"FOREIGN KEY('recipient') REFERENCES Contacts ( name )"</span> <span class="string">")"</span>)) { <a href="../qtcore/qtglobal.html#qFatal">qFatal</a>(<span class="string">"Failed to query database: %s"</span><span class="operator">,</span> <a href="../qtcore/qtglobal.html#qPrintable">qPrintable</a>(query<span class="operator">.</span>lastError()<span class="operator">.</span>text())); } query<span class="operator">.</span>exec(<span class="string">"INSERT INTO Conversations VALUES('Me', 'Ernest Hemingway', '2016-01-07T14:36:06', 'Hello!')"</span>); query<span class="operator">.</span>exec(<span class="string">"INSERT INTO Conversations VALUES('Ernest Hemingway', 'Me', '2016-01-07T14:36:16', 'Good afternoon.')"</span>); query<span class="operator">.</span>exec(<span class="string">"INSERT INTO Conversations VALUES('Me', 'Albert Einstein', '2016-01-01T11:24:53', 'Hi!')"</span>); query<span class="operator">.</span>exec(<span class="string">"INSERT INTO Conversations VALUES('Albert Einstein', 'Me', '2016-01-07T14:36:16', 'Good morning.')"</span>); query<span class="operator">.</span>exec(<span class="string">"INSERT INTO Conversations VALUES('Hans Gude', 'Me', '2015-11-20T06:30:02', 'God morgen. Har du fått mitt maleri?')"</span>); query<span class="operator">.</span>exec(<span class="string">"INSERT INTO Conversations VALUES('Me', 'Hans Gude', '2015-11-20T08:21:03', 'God morgen, Hans. Ja, det er veldig fint. Tusen takk! "</span> <span class="string">"Hvor mange timer har du brukt på den?')"</span>); } SqlConversationModel<span class="operator">::</span>SqlConversationModel(<span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtsql/qsqltablemodel.html">QSqlTableModel</a></span>(parent) { createTable(); setTable(conversationsTableName); setSort(<span class="number">2</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DescendingOrder); <span class="comment">// Ensures that the model is sorted correctly after submitting a new row.</span> setEditStrategy(<span class="type"><a href="../qtsql/qsqltablemodel.html">QSqlTableModel</a></span><span class="operator">::</span>OnManualSubmit); } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> SqlConversationModel<span class="operator">::</span>recipient() <span class="keyword">const</span> { <span class="keyword">return</span> m_recipient; } <span class="type">void</span> SqlConversationModel<span class="operator">::</span>setRecipient(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>recipient) { <span class="keyword">if</span> (recipient <span class="operator">=</span><span class="operator">=</span> m_recipient) <span class="keyword">return</span>; m_recipient <span class="operator">=</span> recipient; <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> filterString <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>fromLatin1( <span class="string">"(recipient = '%1' AND author = 'Me') OR (recipient = 'Me' AND author='%1')"</span>)<span class="operator">.</span>arg(m_recipient); setFilter(filterString); select(); <span class="keyword">emit</span> recipientChanged(); } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> SqlConversationModel<span class="operator">::</span>data(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index<span class="operator">,</span> <span class="type">int</span> role) <span class="keyword">const</span> { <span class="keyword">if</span> (role <span class="operator"><</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole) <span class="keyword">return</span> <span class="type"><a href="../qtsql/qsqltablemodel.html">QSqlTableModel</a></span><span class="operator">::</span>data(index<span class="operator">,</span> role); <span class="keyword">const</span> <span class="type"><a href="../qtsql/qsqlrecord.html">QSqlRecord</a></span> sqlRecord <span class="operator">=</span> record(index<span class="operator">.</span>row()); <span class="keyword">return</span> sqlRecord<span class="operator">.</span>value(role <span class="operator">-</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole); } <span class="type"><a href="../qtcore/qhash.html">QHash</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">></span> SqlConversationModel<span class="operator">::</span>roleNames() <span class="keyword">const</span> { <span class="type"><a href="../qtcore/qhash.html">QHash</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">></span> names; names<span class="operator">[</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole<span class="operator">]</span> <span class="operator">=</span> <span class="string">"author"</span>; names<span class="operator">[</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> <span class="string">"recipient"</span>; names<span class="operator">[</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">2</span><span class="operator">]</span> <span class="operator">=</span> <span class="string">"timestamp"</span>; names<span class="operator">[</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">3</span><span class="operator">]</span> <span class="operator">=</span> <span class="string">"message"</span>; <span class="keyword">return</span> names; } <span class="type">void</span> SqlConversationModel<span class="operator">::</span>sendMessage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>recipient<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>message) { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> timestamp <span class="operator">=</span> <span class="type"><a href="../qtcore/qdatetime.html">QDateTime</a></span><span class="operator">::</span>currentDateTime()<span class="operator">.</span>toString(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ISODate); <span class="type"><a href="../qtsql/qsqlrecord.html">QSqlRecord</a></span> newRecord <span class="operator">=</span> record(); newRecord<span class="operator">.</span>setValue(<span class="string">"author"</span><span class="operator">,</span> <span class="string">"Me"</span>); newRecord<span class="operator">.</span>setValue(<span class="string">"recipient"</span><span class="operator">,</span> recipient); newRecord<span class="operator">.</span>setValue(<span class="string">"timestamp"</span><span class="operator">,</span> timestamp); newRecord<span class="operator">.</span>setValue(<span class="string">"message"</span><span class="operator">,</span> message); <span class="keyword">if</span> (<span class="operator">!</span>insertRecord(rowCount()<span class="operator">,</span> newRecord)) { <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Failed to send message:"</span> <span class="operator"><</span><span class="operator"><</span> lastError()<span class="operator">.</span>text(); <span class="keyword">return</span>; } submitAll(); } </pre> </div> <!-- @@@chattutorial/chapter4-models/sqlconversationmodel.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2018 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>