使用phonegap操作数据库的实现方法

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;i<len;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>         <div id=status></div>     </body>   </html>

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使用phonegap操作数据库的实现方法