日期:2014-05-16 浏览次数:20459 次
基于HTML5的Web DataBase 可以让你在浏览器中进行数据持久地存储管理和有效查询,假设你的离线应用程序有需要规范化的存储功能
本文讲述如何使用
1.新建一个网页,比如:test.html 内容如下:
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk" /> <title>web sql database</title> <script type='text/javascript' src='jquery-1.4.3.js'></script> <script type="text/javascript"> $(function(){ if (!window.openDatabase) { alert("不支持"); } else { initDB(); createTables(); } function initDB(){ var shortName = 'localDB'; var version = '1.0'; var displayName = 'localDB table'; var maxSize = 655350; // in bytes //window.openDatabase("数据库名字", "版本","数据库描述",数据库大小); localDB = window.openDatabase(shortName, version, displayName, maxSize); } function createTables(){ var query = 'CREATE TABLE IF NOT EXISTS user(id INTEGER NOT NULL, username TEXT NOT NULL);'; try { localDB.transaction(function(transaction){ transaction.executeSql(query, [], null, null); }); } catch (e) { console.log("create table failed"); alert("建表失败"); return; } } }); function btnClick(){ var username = $("#username").val(); try { localDB.transaction(function(transaction){ transaction.executeSql("insert into user(id,username) values(?,?)", [1,username]); }); } catch (e) { console.log("insert into failed"); alert("插入失败"); return; } console.log("insert into success"); //alert("insert into success"); } function btnSelect(){ localDB.transaction(function(tx) { tx.executeSql("select * from user", [], function(tx, result) { $("#result").empty(); for(var i = 0; i < result.rows.length; i++){ $("#result").append('<b>' +result.rows.item(i)['id']+"------" +result.rows.item(i)['username']+ '</b><br />'); } }, function(){ alert("error"); }); }); } </script> </head> <body> <div id="my" style="height:100px;width:200px;border:1px solid red;"> <input type="text" name="username" id="username" value=""/> <br/> <button onclick="btnClick()">insert</button> </div> <div id="my1" style="height:300px;width:200px;border:1px solid red;"> <button onclick="btnSelect()">select</button> <div id="result" style="height:300px;width:200px;border:1px solid blue;"> </div> </div> </body> </html>
2.注意引入js文件哦
3.已经ok,直接打开网页浏览 最好用谷歌浏览器,然后 按 F12键 查看 Resources --Web SQ