Database.js Example File | Qt Quick 5.9

Qt 5.9 | Qt Quick | Qt Quick Examples - Local Storage | Database.js Example File

Qt 5.9.3 Reference Documentation

# Database.js Example File

localstorage/localstorage/Database.js

      /****************************************************************************
      **
      ** 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."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      function dbInit()
      {
          var db = LocalStorage.openDatabaseSync("Activity_Tracker_DB", "", "Track exercise", 1000000)
          try {
              db.transaction(function (tx) {
                  tx.executeSql('CREATE TABLE IF NOT EXISTS trip_log (date text,trip_desc text,distance numeric)')
              })
          } catch (err) {
              console.log("Error creating table in database: " + err)
          };
      }

      function dbGetHandle()
      {
          try {
              var db = LocalStorage.openDatabaseSync("Activity_Tracker_DB", "",
                                                     "Track exercise", 1000000)
          } catch (err) {
              console.log("Error opening database: " + err)
          }
          return db
      }

      function dbInsert(Pdate, Pdesc, Pdistance)
      {
          var db = dbGetHandle()
          var rowid = 0;
          db.transaction(function (tx) {
              tx.executeSql('INSERT INTO trip_log VALUES(?, ?, ?)',
                            [Pdate, Pdesc, Pdistance])
              var result = tx.executeSql('SELECT last_insert_rowid()')
              rowid = result.insertId
          })
          return rowid;
      }

      function dbReadAll()
      {
          var db = dbGetHandle()
          db.transaction(function (tx) {
              var results = tx.executeSql(
                          'SELECT rowid,date,trip_desc,distance FROM trip_log order by rowid desc')
              for (var i = 0; i < results.rows.length; i++) {
                  listModel.append({
                                       id: results.rows.item(i).rowid,
                                       checked: " ",
                                       date: results.rows.item(i).date,
                                       trip_desc: results.rows.item(i).trip_desc,
                                       distance: results.rows.item(i).distance
                                   })
              }
          })
      }

      function dbUpdate(Pdate, Pdesc, Pdistance, Prowid)
      {
          var db = dbGetHandle()
          db.transaction(function (tx) {
              tx.executeSql(
                          'update trip_log set date=?, trip_desc=?, distance=? where rowid = ?', [Pdate, Pdesc, Pdistance, Prowid])
          })
      }

      function dbDeleteRow(Prowid)
      {
          var db = dbGetHandle()
          db.transaction(function (tx) {
              tx.executeSql('delete from trip_log where rowid = ?', [Prowid])
          })
      }