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Introduction to the specific implementation methods of operating database using phonegap

黄舟Original: 2017-05-21 14:42:381941browse

The following editor will bring you an implementation method of using phonegap to operate the database. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

The examples are as follows:

<!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(&#39;DROP TABLE IF EXISTS test1&#39;); 
                tx.executeSql(&#39;CREATE TABLE IF NOT EXISTS test1 (id unique,name)&#39;); 
                tx.executeSql(&#39;INSERT INTO test1(id,name) VALUES(1,"Tony")&#39;); 
                tx.executeSql(&#39;INSERT INTO test1(id,name) VALUES(2,"Bill")&#39;); 
                tx.executeSql(&#39;INSERT INTO test1(id,name) VALUES(3,"Tony")&#39;); 
            } 
              
            //查询方法 
            function queryDB(tx){ 
                tx.executeSql(&#39;SELECT * FROM test1&#39;,[],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(&#39;Error processing SQL:&#39;+err.code); 
            } 
              
        </script> 
    </head> 
  
    <body> 
        <h1>Names</h1> 
        <p id=&#39;status&#39;></p> 
    </body> 
  
</html>

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