Question

我有一个sqlite db文件存储在assets项目的cordova文件夹中，我希望在我的应用程序中访问该文件，并且还要更新数据库。

到目前为止，我看到我发现cordova sqlite plug-in可以创建一个sqlite数据库并更新它，但不知道如何从cordova中的资产文件夹更新现有的db文件

以下是我的代码：

<!DOCTYPE html>
<html>
<head>
    <title>Storage Example</title>

    <script type="text/javascript" charset="utf-8" src="cordova-2.0.0.js"></script>
    <script type="text/javascript" charset="utf-8" src="index.js"></script>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="css/conf-room1.min.css" rel="stylesheet" />
    <link href="css/jquery.mobile.icons.min.css" rel="stylesheet" />
    <link href="css/jquery.mobile.structure-1.4.4.min.css" rel="stylesheet" />
    <link href="css/app.css" rel="stylesheet" />
    <link href="css/custom_color.css" rel="stylesheet" />
    <script src="js/jquery-2.1.3.min.js"></script>
    <script src="js/jquery.mobile-1.4.4.min.js"></script>
    <script src="cordova.js"></script>
    <script src="js/jquery-2.1.3.min.js"></script>
    <script src="js/jquery.mobile-1.4.4.min.js"></script>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>


    <script>

    document.addEventListener("deviceready", onDeviceReady, false);

var db = "";

function populateDB(tx) {
    tx.executeSql('DROP TABLE IF EXISTS SoccerPlayer');
    tx.executeSql('CREATE TABLE IF NOT EXISTS SoccerPlayer (Name TEXT NOT NULL, Club TEXT NOT NULL)');
    tx.executeSql('INSERT INTO SoccerPlayer(Name,Club) VALUES ("Test1", "Team1")');
    tx.executeSql('INSERT INTO SoccerPlayer(Name,Club) VALUES ("Test2", "Team2")');
}

function queryDB(tx) {
    tx.executeSql('SELECT * FROM SoccerPlayer', [], querySuccess, errorCB);
}


function querySuccess(tx,result){
        var playerlist = document.getElementById("SoccerPlayerList");
        var players = "";
        alert("The show is on");
        var len = result.rows.length;
        for (var i=0; i<len; i++){
            alert(result.rows.item(i).Name + result.rows.item(i).Club);
            players = players + '<li><a href="#"><p class="record">'+result.rows.item(i).Name+'</p><p class="small">Club '+result.rows.item(i).Club+'</p></a></li>';
        }

        playerlist.innerHTML = players;
        $("#SoccerPlayerList").listview("refresh");
}


function errorCB(err) {
    alert("Error processing SQL: "+err.code);
}


function successCB() {
    db.transaction(queryDB, errorCB);
}


function onDeviceReady() {
    <!--db = window.openDatabase("SimpleTestOne", "1.0", "PhoneGap Demo", 200000);-->
   db =  window.openDatabase({name: "SimpleTestOne.db", createFromLocation: 1});
    db.transaction(populateDB, errorCB, successCB);
}
    </script>


</head>
<body>

<div data-role="page">
    <div data-role="header" data-position="fixed" data-theme="b">
        <h1>Soccer Player</h1>
    </div>
    <div data-role="content">
        <ul id="SoccerPlayerList">
        </ul>
    </div>
</div>
<!--end of Soccer Player Page--->
</body>
</html>

注意：我的资源文件夹中有SimpleTestOne.db

Answer 1

您可以尝试使用以下Snippet.

This snippet contains all the part from Data base creation to Insert , Edit , Delete , Update and Display data您的数据库。

注意： Change your Database name and Table name and Database fields here whatever you want to keep。

<script type="text/javascript" charset="utf-8">

        // Wait for Cordova to load
        //
        document.addEventListener("deviceready", onDeviceReady, false);

        var currentRow;
        // Populate the database
        //
        function populateDB(tx) {
            tx.executeSql('CREATE TABLE IF NOT EXISTS DEMO (id INTEGER PRIMARY KEY AUTOINCREMENT, name,number)');
        }

        // Query the database
        //
        function queryDB(tx) {
            tx.executeSql('SELECT * FROM DEMO', [], querySuccess, errorCB);
        }

        function searchQueryDB(tx) {
            tx.executeSql("SELECT * FROM DEMO where name like ('%"+ document.getElementById("txtName").value + "%')",
                    [], querySuccess, errorCB);
        }
        // Query the success callback
        //
        function querySuccess(tx, results) {
            var tblText='<table id="t01"><tr><th>ID</th> <th>Name</th> <th>Number</th></tr>';
            var len = results.rows.length;
            for (var i = 0; i < len; i++) {
                var tmpArgs=results.rows.item(i).id + ",'" + results.rows.item(i).name
                        + "','" + results.rows.item(i).number+"'";
                tblText +='<tr onclick="goPopup('+ tmpArgs + ');"><td>' + results.rows.item(i).id +'</td><td>'
                        + results.rows.item(i).name +'</td><td>' + results.rows.item(i).number +'</td></tr>';
            }
            tblText +="</table>";
            document.getElementById("tblDiv").innerHTML =tblText;
        }

        //Delete query
        function deleteRow(tx) {
          tx.executeSql('DELETE FROM DEMO WHERE id = ' + currentRow, [], queryDB, errorCB);
        }

        // Transaction error callback
        //
        function errorCB(err) {
            alert("Error processing SQL: "+err.code);
        }

        // Transaction success callback
        //
        function successCB() {
            var db = window.openDatabase("Database", "1.0", "Cordova Demo", 200000);
            db.transaction(queryDB, errorCB);
        }

         // Cordova is ready
        //
        function onDeviceReady() {
            var db = window.openDatabase("Database", "1.0", "Cordova Demo", 200000);
            db.transaction(populateDB, errorCB, successCB);
        }

        //Insert query
        //
        function insertDB(tx) {
            tx.executeSql('INSERT INTO DEMO (name,number) VALUES ("' +document.getElementById("txtName").value
                    +'","'+document.getElementById("txtNumber").value+'")');
        }

        function goInsert() {
            var db = window.openDatabase("Database", "1.0", "Cordova Demo", 200000);
            db.transaction(insertDB, errorCB, successCB);
        }

        function goSearch() {
            var db = window.openDatabase("Database", "1.0", "Cordova Demo", 200000);
            db.transaction(searchQueryDB, errorCB);
        }

        function goDelete() {
             var db = window.openDatabase("Database", "1.0", "Cordova Demo", 200000);
             db.transaction(deleteRow, errorCB);
             document.getElementById('qrpopup').style.display='none';
        }

        //Show the popup after tapping a row in table
        //
        function goPopup(row,rowname,rownum) {
            currentRow=row;
            document.getElementById("qrpopup").style.display="block";
            document.getElementById("editNameBox").value = rowname;
            document.getElementById("editNumberBox").value = rownum;
        }

        function editRow(tx) {
            tx.executeSql('UPDATE DEMO SET name ="'+document.getElementById("editNameBox").value+
                    '", number= "'+document.getElementById("editNumberBox").value+ '" WHERE id = '
                    + currentRow, [], queryDB, errorCB);
        }
        function goEdit() {
            var db = window.openDatabase("Database", "1.0", "Cordova Demo", 200000);
            db.transaction(editRow, errorCB);
            document.getElementById('qrpopup').style.display='none';
        }

    </script>

I am using this code for one of my app and it's working fine.

修改1：

注意： Please place your db file in wwww directory like for e.g projectpath/www/dbname.db。

For accessing db file from asset folder.

window.openDatabase({name: "dbname.db", createFromLocation: 1});

编辑2：

Just install below plugin in your app。

cordova plugin add https://github.com/brodysoft/Cordova-SQLitePlugin.git

And Try this.

 var db = window.sqlitePlugin.openDatabase({name: "my.db", createFromLocation: 1});

如何使用cordova访问和更新项目文件中存储在本地[资产文件夹]的Sqlite db文件

1 个答案: