Question

我试图使用此程序：

DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_login`(
    IN in_Email VARCHAR(60),
    IN in_Pass VARCHAR(45)
    )
BEGIN
    DECLARE d_UserType VARCHAR(45);
    SET d_UserType := db.get_usertype( (SELECT ID FROM User WHERE Email = in_Email ) );

    IF (d_UserType = '1') THEN

        SELECT * FROM User inner join tableA on tableA.ID = User.tableA_ID;

    ELSEIF (d_UserType = '2') THEN

        SELECT * FROM User inner join tableB on tableB.ID = User.tableB_ID;

    ELSEIF (d_UserType = '3') THEN

        SELECT * FROM User inner join tableC on tableC.ID = User.tableC_ID;

    END IF;
END

但我收到以下错误：ERROR 1305（42000）：FUNCTION db.get_usertype不存在。

CALL db.get_usertype( (SELECT ID FROM User WHERE Email = 'example@example.com') );

当我单独测试时，

工作正常。任何人都知道它为什么起作用？

我试过了：

SET d_UserType := CALL db.get_usertype( (SELECT ID FROM User WHERE Email = in_Email ) );
SET d_UserType := EXEC db.get_usertype( (SELECT ID FROM User WHERE Email = in_Email ) );
SET d_UserType := EXECUTE db.get_usertype( (SELECT ID FROM User WHERE Email = in_Email ) );

没有运气..

所有帮助的Thx！

Answer 1

编辑完全忽略我之前关于在存储过程中调用存储过程的评论！存储过程不返回结果。但是，您可以将存储过程插入临时表中，您可以从中进行选择。以下答案仍然是您所寻求的。

CALL db.get_usertype((SELECT ID FROM User WHERE Email = in_Email ));
SET d_UserType = (SELECT usertype FROM temp_get_usertype);

我相信你想要的是get_usertype而不是function。在某些情况下，您可以使用视图。

SET d_UserType = db.get_usertype((SELECT ID FROM User WHERE Email = in_Email ))

e.g。

CREATE FUNCTION `get_usertype`(userID INT) RETURNS INT
BEGIN
    DECLARE $type INT;
    ...
    RETURN $type;
END

Mysql：在Procedure里面调用存储过程的返回值

1 个答案: