<?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>Database.js Example File | Qt Quick 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="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-localstorage-example.html">Qt Quick Examples - Local Storage</a></td><td >Database.js 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">Database.js Example File</h1> <span class="subtitle">localstorage/localstorage/Database.js</span> <!-- $$$localstorage/localstorage/Database.js-description --> <div class="descr"> <a name="details"></a> <pre class="js"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the documentation 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="keyword">function</span> <span class="name">dbInit</span>() { var <span class="name">db</span> = <span class="name">LocalStorage</span>.<span class="name">openDatabaseSync</span>(<span class="string">"Activity_Tracker_DB"</span>, <span class="string">""</span>, <span class="string">"Track exercise"</span>, <span class="number">1000000</span>) <span class="keyword">try</span> { <span class="name">db</span>.<span class="name">transaction</span>(<span class="keyword">function</span> (<span class="name">tx</span>) { <span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">'CREATE TABLE IF NOT EXISTS trip_log (date text,trip_desc text,distance numeric)'</span>) }) } <span class="keyword">catch</span> (<span class="name">err</span>) { console.log("Error creating table in database: " + err) }; } <span class="keyword">function</span> <span class="name">dbGetHandle</span>() { <span class="keyword">try</span> { var <span class="name">db</span> = <span class="name">LocalStorage</span>.<span class="name">openDatabaseSync</span>(<span class="string">"Activity_Tracker_DB"</span>, <span class="string">""</span>, <span class="string">"Track exercise"</span>, <span class="number">1000000</span>) } <span class="keyword">catch</span> (<span class="name">err</span>) { console.log("Error opening database: " + err) } <span class="keyword">return</span> <span class="name">db</span> } <span class="keyword">function</span> <span class="name">dbInsert</span>(<span class="name">Pdate</span>, Pdesc, Pdistance) { var <span class="name">db</span> = <span class="name">dbGetHandle</span>() var <span class="name">rowid</span> = <span class="number">0</span>; <span class="name">db</span>.<span class="name">transaction</span>(<span class="keyword">function</span> (<span class="name">tx</span>) { <span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">'INSERT INTO trip_log VALUES(?, ?, ?)'</span>, [<span class="name">Pdate</span>, <span class="name">Pdesc</span>, <span class="name">Pdistance</span>]) var <span class="name">result</span> = <span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">'SELECT last_insert_rowid()'</span>) <span class="name">rowid</span> <span class="operator">=</span> <span class="name">result</span>.<span class="name">insertId</span> }) <span class="keyword">return</span> <span class="name">rowid</span>; } <span class="keyword">function</span> <span class="name">dbReadAll</span>() { var <span class="name">db</span> = <span class="name">dbGetHandle</span>() <span class="name">db</span>.<span class="name">transaction</span>(<span class="keyword">function</span> (<span class="name">tx</span>) { var <span class="name">results</span> = <span class="name">tx</span>.<span class="name">executeSql</span>( <span class="string">'SELECT rowid,date,trip_desc,distance FROM trip_log order by rowid desc'</span>) <span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="number">0</span>; <span class="name">i</span> <span class="operator"><</span> <span class="name">results</span>.<span class="name">rows</span>.<span class="name">length</span>; i++) { <span class="name">listModel</span>.<span class="name">append</span>({ id: <span class="name">results</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="name">i</span>).<span class="name">rowid</span>, checked: <span class="string">" "</span>, date: <span class="name">results</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="name">i</span>).<span class="name">date</span>, trip_desc: <span class="name">results</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="name">i</span>).<span class="name">trip_desc</span>, distance: <span class="name">results</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="name">i</span>).<span class="name">distance</span> }) } }) } <span class="keyword">function</span> <span class="name">dbUpdate</span>(<span class="name">Pdate</span>, Pdesc, Pdistance, Prowid) { var <span class="name">db</span> = <span class="name">dbGetHandle</span>() <span class="name">db</span>.<span class="name">transaction</span>(<span class="keyword">function</span> (<span class="name">tx</span>) { <span class="name">tx</span>.<span class="name">executeSql</span>( <span class="string">'update trip_log set date=?, trip_desc=?, distance=? where rowid = ?'</span>, [<span class="name">Pdate</span>, <span class="name">Pdesc</span>, <span class="name">Pdistance</span>, <span class="name">Prowid</span>]) }) } <span class="keyword">function</span> <span class="name">dbDeleteRow</span>(<span class="name">Prowid</span>) { var <span class="name">db</span> = <span class="name">dbGetHandle</span>() <span class="name">db</span>.<span class="name">transaction</span>(<span class="keyword">function</span> (<span class="name">tx</span>) { <span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">'delete from trip_log where rowid = ?'</span>, [<span class="name">Prowid</span>]) }) } </pre> </div> <!-- @@@localstorage/localstorage/Database.js --> </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>