如何将ID列表传递给MySQL存储过程？

时间：2021-07-18 08:52:32

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

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

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 ;

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.

显然，这不起作用，因为当我传递文本值时，id_list被内插为整数，并且只考虑第一个ID并在IN（）条件内使用。

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?

我意识到这个特定类型的过程可以替换为包含的查询，但我认为我的问题仍然存在 - 如果我需要传递这种数据怎么办？

I also realize that this approach of query might not be considered the best practice, but in my use case it's actually better than returning a flat list of ID-ID pairs..

我也意识到这种查询方法可能不被认为是最佳实践，但在我的用例中，它实际上比返回一个ID-ID对的平面列表更好。

1 个解决方案

#1

28  

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

您应该能够使用MySQL的FIND_IN_SET（）来使用id列表：

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;
    ...

#1

28  

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

您应该能够使用MySQL的FIND_IN_SET（）来使用id列表：

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;
    ...
标签：

相关文章