<?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'=>'', ':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));

?>