php模拟数据库常用操作效果

<?php
header("Content-type:text/html;charset='utf8'");
error_reporting(E_ALL);

echo "模拟数据库常用操作效果<br>";
echo "<a href='check.php?action=add'>执行增加操作</a><br>";
echo "<a href='check.php?action=del'>执行删除操作</a><br>";
echo "<a href='check.php?action=search'>执行查找操作</a><br>";
echo "<a href='check.php?action=update'>执行更新操作</a><br>";

<?php
if(isset($_GET['action'])){
switch($_GET['action']){
case "add":
echo "<script>alert('add');</script>";
break;
case "del":
echo "<script>alert('del');</script>";
break;
case "search":
echo "<script>alert('search');</script>";
break;
case "update";
echo "<script>alert('update');</script>";
break;
default:
echo "<script>alert('error');</script>";
break;
}
// echo "<script>window.location = 'test.php';</script>";
echo "<script>history.go(-1);</script>";
}