phonegap操作数据库详解

实例如下：

!DOCTYPE htML>
     html>
           head>
             meta charset="UTF-8">
             tITle>
    Database Example/title>
               script type="text/javascript" charset="UTF-8" src="cordova.js">
    /script>
             script type="text/javascript" charset="UTF-8">
                 document.addEventListener("deviceready", onDeviceReady, false);
               function onDeviceReady() {
                     VAR db=window.openDatabase("test","1.0","Test",200000);
                     db.transaction(populateDB,errorDB,succeSSDB);
             }
                           //初始化数据库数据             function populateDB(tx){
                     tx.executeSQL('DROP TABLE IF EXISTS test1');
                     tx.executeSql('CREATE TABLE IF NOT EXISTS test1 (id unique,name)');
                     tx.executeSql('INSERT INTO test1(id,name) VALUES(1,"Tony")');
                     tx.executeSql('INSERT INTO test1(id,name) VALUES(2,"Bill")');
                     tx.executeSql('INSERT INTO test1(id,name) VALUES(3,"Tony")');
             }
                           //查询方法             function queryDB(tx){
                     tx.executeSql('SELECT * From test1',[],querySuccess,errorDB);
             }
                           //查询成功回调             function querySuccess(tx,results){
                     var len=results.rows.length;
                     var status=document.getElementById("status");
                     var string ="Rows:"+len+"br />
    ";
                     for(var i=0;
    ilen;
i++){
                         string+=results.rows.item(i).name+"br />
    ";
                 }
                     status.innerHTML=string;
             }
                           //执行初始化数据成功后的回调             function successDB(){
                     var db=window.openDatabase("Test","1.0","Test",200000);
                     db.transaction(queryDB,errorDB);
             }
                           //失败回调             function errorDB(err){
                     alert('Error PRocessing SQL:'+err.code);
             }
                           /script>
         /head>
           body>
             h1>
    names/h1>
             p id='status'>
    /p>
         /body>
       /html>
    

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