<span id="status"></span>
<script>
var e_id = 3;
var e_log = 'blog';
创建数据库
var db = openDatabase('mydb', '1.0', 'Test DB', 2 * 1024 * 1024);
创建表
db.transaction(function (tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS LOGS (id unique, log)');
});
添加
db.transaction(function (tx) {
tx.executeSql('INSERT INTO LOGS (id, log) VALUES (4, "同学")');
tx.executeSql('INSERT INTO LOGS (id, log) VALUES (2, "www.123.com")');
});
添加
db.transaction(function (tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS LOGS (id unique, log)');
tx.executeSql('INSERT INTO LOGS (id,log) VALUES (?, ?)', [e_id, e_log]);
});
查
db.transaction(function (tx) {
tx.executeSql('SELECT * FROM LOGS', [], function (tx, results) {
var len = results.rows.length, i;
msg = "<p>查询记录条数: " + len + "</p>";
document.querySelector('#status').innerHTML += msg;
for (i = 0; i < len; i++){
alert(results.rows.item(i).log );
}
}, null);
});
删除
db.transaction(function (tx) {
tx.executeSql('DELETE FROM LOGS WHERE id=1');
});
db.transaction(function(tx) {
tx.executeSql('DELETE FROM LOGS WHERE id=?', [id]);
});
更新
db.transaction(function (tx) {
tx.executeSql('UPDATE LOGS SET log=\'www.w3cschool.cc\' WHERE id=2');
});
db.transaction(function(tx) {
tx.executeSql('UPDATE LOGS SET log=\'www.w3cschool.cc\' WHERE id=?', [id]);
});
</script>
看案例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Web SQL 数据库</title>
</head>
<body>
<div id="status" name="status">状态信息</div>
<script type="text/javascript">
var db = openDatabase('mydb', '1.0', 'Test DB', 2 * 1024 * 1024);
var msg;
db.transaction(function (tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS LOGS (id unique, log)');
tx.executeSql('INSERT INTO LOGS (id, log) VALUES (1, "同学")');
tx.executeSql('INSERT INTO LOGS (id, log) VALUES (2, "www.123.com")');
msg = '<p>数据表已创建，且插入了两条数据。</p>';
document.querySelector('#status').innerHTML = msg;
});
db.transaction(function (tx) {
tx.executeSql('SELECT * FROM LOGS', [], function (tx, results) {
var len = results.rows.length, i;
msg = "<p>查询记录条数: " + len + "</p>";
document.querySelector('#status').innerHTML += msg;
for (i = 0; i < len; i++){
msg = "<p><b>" + results.rows.item(i).log + "</b></p>";
document.querySelector('#status').innerHTML += msg;
}
}, null);
});
</script>
</body>
</html>