PHP中用PDO方法打开连接关闭mysql数据库

 1 <meta http-equiv="content-type" content="text/html" charset="utf-8"/>
 2 <h1>用PDO方法连接数据库！-姚远的博客</h1>
 3 <form method="POST" action="<?php echo iconv("GB2312","UTF-8",htmlspecialchars($_SERVER[‘PHP_SELF‘]));?>">
 4 服务器地址：<input type="text" name="mysqlPDOip"/><br/>
 5 服务器账号：<input type="text" name="mysqlPDOuser"/><br/>
 6 服务器密码：<input type="password" name="mysqlPDOpassword"/><br/>
 7 <input type="submit" value="连接mysql"/>
 8 </form>
 9 <?php
10 if($_SERVER[‘REQUEST_METHOD‘]=="POST"){//if判断是否POST提交
11     $servername=$_POST[‘mysqlPDOip‘];
12     $username=$_POST[‘mysqlPDOuser‘];
13     $password=$_POST[‘mysqlPDOpassword‘];
14     try{
15         //$conn = new PDO("mysql:host=$servername;dbname=myDB",$username,$password);
16         $conn = new PDO("mysql:host=$servername;dbname=mysql", $username, $password);//连接数据库
17         echo "连接成功！";
18         echo "<br/>你所连接的服务器地址：".$servername;
19         echo "<br/>你所连接的服务器账号：".$username;
20         echo "<br/>你所链接的服务器密码：".$password;
21         $conn = null;//关闭数据库连接
22         echo "<br/>已成功关闭数据库";
23     }
24     catch(PDOException $e)
25     {
26         echo $e->getMessage();
27     }
28 }
29 ?>