Detailed explanation of phonegap operation database
This time I will bring you a detailed explanation of the phonegap operation database, what are the precautions for phonegap operation database, the following is a practical case, let's 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('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>
<p id='status'></p>
</body>
</html>I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website !
Recommended reading:
Detailed explanation of creating contacts with phonegap
How to change the code of the current url without refreshing
The above is the detailed content of Detailed explanation of phonegap operation database. For more information, please follow other related articles on the PHP Chinese website!
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