php中pdo例子

下面是从其他博客看到的代码

<?php
$dbh = new PDO('mysql:host=localhost;dbname=access_control', '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'=>'kevin2',':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 'kevin_'"; //kevin%
$stmt = $dbh->prepare($sql);
$stmt->execute();
echo $stmt->rowCount();
/*查询*/
$login = 'kevin%';
$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));
?>

注意事项:

1,链接pdo时,host和database后面不能加空格,这三大项是用逗号隔开的.

$dbh = new PDO('mysql:host=localhost;dbname=access_control', 'root', '');

2,如果不慎把这三项在一个双引号里面,php会报下面这个错误.

PHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[28000] [1045] Access denied for user 'komiles'@'localhost' (using password: NO)'