首页 | 简单教程,简单编程

代码编辑器：

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, "简单教程")');
      tx.executeSql('INSERT INTO logs (id, log) VALUES (2, "www.twle.cn")');
      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('DELETE FROM logs  WHERE id=1');
        msg = '<p>删除 id 为 1 的记录。</p>';
        document.querySelector('#status').innerHTML =  msg;
   });

db.transaction(function (tx) {
       tx.executeSql('UPDATE logs SET log=\'twle.cn\' WHERE id=2');
        msg = '<p>更新 id 为 2 的记录。</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>
<div id="status" name="status">状态信息</div>

代码编辑器：

运行结果：