标签：pre 创建表 document listen not ++ end student read
HTML5里的Web SQL数据库，内置了SQLite数据库，
对数据库的操作使用executeSql执行增删改查
1. 创建数据库
function creatDatabase(){
db = openDatabase(‘Student‘, ‘1.0‘, ‘StuManage‘, 2 * 1024 * 1024);
}
2. 创建表
function createTable(){
if (db) {
var strSQL = "create table if not exists StuInfo ";
strSQL += " (StuID unique,Name text,Sex text,Score int)";
db.transaction(function(tx) {
tx.executeSql(strSQL)
},
function() {
console.log("创建表错误");
},
function() {
console.log("创建表成功");
})
}
3. 增加数据
function addData() {
if (db) {
var strSQL = "insert into StuInfo values";
strSQL += "(?,?,?,?)";
db.transaction(function(tx) {
tx.executeSql(strSQL,[
$$("txtStuID").value,$$("txtName").value,
$$("selSex").value,$$("txtScore").value
],
function(){
$$("txtName").value="";
$$("txtScore").value="";
alert("成功增加1条记录!");
},
function(tx,ex){
console.log(ex.message)
})
})
}
}
4. 查询数据
function queryData(){
if(db){
var sql = "select * from StuInfo";
db.transaction(function(tx) {
tx.executeSql(sql,[],
function(tx, results){
var len = results.rows.length,i;
var htmlData = "";
for(i = 0; i < len; i++){
var item = results.rows.item(i);
var htmlitem = item.StuID + " " + item.Name + " " + item.Sex + " " + item.Score;
htmlData += htmlitem + "</br> ";
}
$$("info").innerHTML = htmlData;
},
function(tx,ex){
console.log(ex.message)
})
})
}
}
5. 删除数据
function deleteData(){
if (db) {
var strSQL = "delete from StuInfo where StuID = ?";
db.transaction(function(tx) {
tx.executeSql(strSQL,[
$$("txtStuID").value
],
function(){
alert("成功删除1条记录!");
},
function(tx,ex){
console.log(ex.message)
})
})
}
queryData();
}
完整的Code如下
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="format-detection" content="telephone=no" />
<meta name="msapplication-tap-highlight" content="no" />
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width" />
<meta http-equiv="Content-Security-Policy" content="default-src * ‘unsafe-inline‘; style-src ‘self‘ ‘unsafe-inline‘; media-src *" />
<link rel="stylesheet" href="css/jquery.mobile-1.4.5.min.css">
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.mobile-1.4.5.min.js"></script>
<script type="text/javascript" charset="utf-8" src="cordova.js" ></script>
<title>Hello World</title>
<script type="text/javascript" charset="utf-8">
function $$(id) {
return document.getElementById(id);
}
var db;
document.addEventListener(‘deviceready‘, onDeviceReady, false);
function onDeviceReady(){
var db = creatDatabase();
createTable();
queryData();
}
function creatDatabase(){
db = openDatabase(‘Student‘, ‘1.0‘, ‘StuManage‘, 2 * 1024 * 1024);
}
function createTable(){
if (db) {
var strSQL = "create table if not exists StuInfo ";
strSQL += " (StuID unique,Name text,Sex text,Score int)";
db.transaction(function(tx) {
tx.executeSql(strSQL)
},
function() {
console.log("创建表错误");
},
function() {
console.log("创建表成功");
})
}
}
function addData() {
if (db) {
var strSQL = "insert into StuInfo values";
strSQL += "(?,?,?,?)";
db.transaction(function(tx) {
tx.executeSql(strSQL,[
$$("txtStuID").value,$$("txtName").value,
$$("selSex").value,$$("txtScore").value
],
function(){
$$("txtName").value="";
$$("txtScore").value="";
alert("成功增加1条记录!");
},
function(tx,ex){
console.log(ex.message)
})
})
}
queryData();
}
function queryData(){
if(db){
var sql = "select * from StuInfo";
db.transaction(function(tx) {
tx.executeSql(sql,[],
function(tx, results){
var len = results.rows.length,i;
var htmlData = "";
for(i = 0; i < len; i++){
var item = results.rows.item(i);
var htmlitem = item.StuID + " " + item.Name + " " + item.Sex + " " + item.Score;
htmlData += htmlitem + "</br> ";
}
$$("info").innerHTML = htmlData;
},
function(tx,ex){
console.log(ex.message)
})
})
}
}
function deleteData(){
if (db) {
var strSQL = "delete from StuInfo where StuID = ?";
db.transaction(function(tx) {
tx.executeSql(strSQL,[
$$("txtStuID").value
],
function(){
alert("成功删除1条记录!");
},
function(tx,ex){
console.log(ex.message)
})
})
}
queryData();
}
</script>
</head>
<body>
<div id="page1" data-role="page" data-add-back-btn="true">
<div data-role="content">
<fieldset>
<legend>新增学生资料</legend>
<span class="spanl">
学号：<input type="text" id="txtStuID" size="10"><br>
姓名：<input type="text" id="txtName" size="15">
</span>
<span>
性别：<select id="selSex">
<option value="男">男</option>
<option value="女">女</option>
</select><br>
总分：<input type="text" id="txtScore" size="8">
</span>
<p class="btn">
<input id="btnAdd" type="button" value="提交" onClick="addData();">
</p>
</fieldset>
<p id="info">显示结果</p>
<input type="button" value="删除记录" onClick="deleteData();">
</div>
</div>
</body>
</html>
标签：pre 创建表 document listen not ++ end student read
原文地址：http://www.cnblogs.com/linlf03/p/6657152.html
