php mysql PDO基本操作

<?php  
　　$dbh = new PDO('mysql:host=localhost;dbname=localhost', 'root', '');    
　　$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);    
　　$dbh->exec('set names utf8');   
/*添加*/  
　　//$sql = "INSERT INTO `user` SET `login`=:login AND `password`=:password";   
　　$sql = "INSERT INTO `user` (`login` ,`password`)VALUES (:login, :password)";
  　$stmt = $dbh->prepare($sql);
  　$stmt->execute(array(':login'=>'admin1',':password'=>''));    
　　echo $dbh->lastinsertid();    
/*修改*/  
　　$sql = "UPDATE `user` SET `password`=:password WHERE `user_id`=:userId";    
　　$stmt = $dbh->prepare($sql);    
　　$stmt->execute(array(':userId'=>'7', ':password'=>'4607e782c4d86fd5364d7e4508bb10d9'));    
　　echo $stmt->rowCount();   
/*删除*/  
　　$sql = "DELETE FROM `user` WHERE `login` LIKE 'admin_'"; //admin%    
　　$stmt = $dbh->prepare($sql);    
　　$stmt->execute();    
　　echo $stmt->rowCount();    
/*查询*/  
　　$login = 'admin%';    
　　$sql = "SELECT * FROM `user` WHERE `login` LIKE :login";    
　　$stmt = $dbh->prepare($sql);    
　　$stmt->execute(array(':login'=>$login));    
　　while($row = $stmt->fetch(PDO::FETCH_ASSOC)){       
　　 　　print_r($row);    
　　}    
　　print_r( $stmt->fetchAll(PDO::FETCH_ASSOC));   
?>