Question

你可以告诉我这个查询有什么问题吗？我一直在找一个小时，但我看不出任何语法错误..

$query = $database->connection->prepare(
        "SELECT 
        n.from_id AS friend_id, 
        n.type AS type,
        n.created_date AS time,
        u.user_profile_picture AS profile_picture, 
        u.user_firstname AS friend_firstname, 
        u.user_lastname AS friend_lastname, 
        FROM notifications n INNER JOIN users u ON u.user_id = n.from_id 
        WHERE n.to_id = :user_id AND n.checked = 1");   

    $query->bindValue(':user_id', $user_id, PDO::PARAM_STR); 
    $query->execute();

这是错误：

未捕获的异常＆＃39; PDOException＆＃39;有消息

＆＃39; SQLSTATE [42000]：语法错误或访问冲突：1064您有   SQL语法错误;查看与您的手册相对应的手册   MySQL服务器版本，用于在＆＃39; FROM附近使用正确的语法   通知n INNER JOIN用户u ON u.user_id = n.from_id WHERE   n.to_id =＆＃39;在第8行＆＃39;在

Answer 1

删除,

之前的FROM

SELECT 
        n.from_id AS friend_id, 
        n.type AS type,
        n.created_date AS time,
        u.user_profile_picture AS profile_picture, 
        u.user_firstname AS friend_firstname, 
        u.user_lastname AS friend_lastname 
        FROM notifications n INNER JOIN users u ON u.user_id = n.from_id 
        WHERE n.to_id = :user_id AND n.checked = 1

Answer 2

您必须删除行尾的逗号：

u.user_lastname AS friend_lastname,

PDO查询语法错误

2 个答案: