PDO Delete

例子：

<?php
//构造PDO连接
$dbh = "mysql:host=localhost;dbname=test";
$db = new PDO($dbh, 'root', 'root123');
$db->query("set character set 'gbk'"); 

//删除数据
$sql = "DELETE FROM user WHERE username = '小陈'";
$count = $db->exec($sql);
echo '删除 ',$count,' 条数据记录！';
$db = null;
?>