php – PDO fetch什么都不返回

参见英文答案 > PHP PDOException: “SQLSTATE[HY093]: Invalid parameter number”????????????????????????????????????4个
我遇到了一个小问题.
我有以下代码：

    $query = $db->prepare('(SELECT last_visit, last_ip FROM user_log WHERE user_id = :id) 
                            UNION
                           (SELECT time AS last_visit, packet_hex AS last_ip FROM crack_log WHERE target_id = :id)
                            ORDER BY last_visit DESC LIMIT 0,10;');
    $query->execute(array(':id'=> $_SESSION['id']));
    $log = $query->fetchAll(PDO::FETCH_ASSOC); //Last visit/IP

    var_dump($log);

哪个回报：

array(0) { } 

我在PHPmyadmin尝试了查询,它工作正常.你能帮我找到错误吗？

解决方法:

Accorrding to the documentation

You cannot use a named parameter marker of the same name twice in a
prepared statement.
You cannot bind multiple values to a single named parameter in, for
example, the IN() clause of an sql statement.

在你的情况下,你应该使用类似的东西

$query = $db->prepare('(SELECT last_visit, 
                               last_ip 
                        FROM user_log 
                        WHERE user_id = :id_1
                       ) 
                        UNION
                       (SELECT time AS last_visit,
                               packet_hex AS last_ip 
                        FROM crack_log 
                        WHERE target_id = :id_2
                       )
                       ORDER BY last_visit DESC LIMIT 0,10;'
                     );
    $query->execute(array(':id_1'=> $_SESSION['id'],
                          ':id_2'=> $_SESSION['id'] 
                         )
                   );  

（编辑：北几岛）

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