转换的Microsoft SQL到mysql

Question

我这个转换到MySQL从MSSQL，但它给我这个错误：

错误代码：1415不允许从函数返回的结果集

什么我做错了吗？

DELIMITER $$ 

CREATE FUNCTION GetPositionList (orderDetID NUMERIC) 
RETURNS NVARCHAR(200)  
DETERMINISTIC 
BEGIN 
DECLARE strToReturn NVARCHAR(50); 
DECLARE strPos NVARCHAR(50); 
DECLARE strPosOtherRes NVARCHAR(50); 
DECLARE strTPos NVARCHAR(50); 
DECLARE strTPosOtherResr NVARCHAR(50) 


SET strToReturn = ''; 
SET strPos = SELECT `POSITION` FROM orderdetails WHERE OrderID = orderDetID; 
SET strPosOtherRes = SELECT SecPosition FROM orderdetails WHERE OrderID = orderDetID; 
SET strTPos = SELECT TeamPosition FROM orderdetails WHERE OrderID = orderDetID; 
SET strTPosOtherResr = SELECT TeamSecPosition FROM orderdetails WHERE OrderID = orderDetID; 


IF(strPos != '') THEN SET strToReturn = CONCAT(strPos , ','); 
END IF; 
IF(strPosOtherRes != '') THEN SET strToReturn = CONCAT(strToReturn , strPosOtherRes , ','); 
END IF; 
IF(strTPos != '') THEN SET strToReturn = CONCAT(strToReturn , strTPos , ','); 
END IF; 
IF(strTPosOtherResr != '') THEN SET strToReturn = CONCAT(strToReturn , strTPosOtherResr , ','); 
END IF;  
RETURN SUBSTRING(strToReturn, 0, LENGTH(strToReturn)); 
END $$ 
DELIMITER ; 

Answer 1

在MySQL中为变量选择值的语法是select ... into。例如，你可以写：

SELECT POSITION, SecPosition FROM orderdetails 
WHERE OrderID = orderDetID INTO strPos, strPosOtherRes; 

消息“不允许从函数返回的结果集”指的SELECT语句因为他们的立场，现在会从功能返回一个结果，而功能只能返回单个值。