如何将 ID 列表传递给 MySQL 存储过程?

2021-12-20 00:00:00 mysql stored-procedures

我正在编写一个存储过程，它应该将其参数传递给过程主体中查询的 IN (..) 部分，如下所示:

I'm writing a stored procedure which should pass its arguments to IN (..) part of query in the procedure body, like this:

DELIMITER //

CREATE PROCEDURE `get_users_per_app` (id_list TEXT)
BEGIN
    SELECT app_id, GROUP_CONCAT(user_id) FROM app_users WHERE app_id IN (id_list) GROUP BY app_id;
END//

DELIMITER ;

这显然不起作用，因为当我传递一个文本值时，id_list 被插入为一个整数，并且只有第一个 ID 被考虑并用于 IN()IN()代码>条件.

This, obviously, doesn't work because when I pass a textual value, id_list is interpolated as an integer and only first ID is considered and used inside of IN() condition.

我意识到可以用包含的查询代替这种特定类型的过程，但我认为我的问题仍然存在 - 如果我需要传递此类数据怎么办?

I realize that this particular type of procedure could be instead replaced by the contained query, but I think that my question still stands - what if I needed to pass this kind of data?

我也意识到这种查询方法可能不被视为最佳实践，但在我的用例中，它实际上比返回 ID-ID 对的平面列表要好..

推荐答案

你应该能够使用 MySQL 的 FIND_IN_SET() 使用 id 列表:

You should be able to use MySQL's FIND_IN_SET() to use the list of ids:

CREATE PROCEDURE `get_users_per_app` (id_list TEXT)
BEGIN
    SELECT
        app_id, GROUP_CONCAT(user_id)
    FROM
        app_users
    WHERE
        FIND_IN_SET(app_id, id_list) > 0
    GROUP BY app_id;
    ...

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