的MySQL函數返回

Question

我有一個存儲過程：

CREATE DEFINER=`root`@`localhost` PROCEDURE `InsertRaffleTicket`(IN userId BIGINT, IN raffleId BIGINT) 
BEGIN 
    INSERT INTO RaffleTicket(UserId, RaffleId) 
    SELECT userId, raffleId 
    FROM RaffleStatus rs 
    WHERE rs.RaffleId = raffleId 
    AND rs.SoldOut = 0; 
END 

如何，我可以把它變成一個功能，將返回在成功插入一個值到表？

我曾嘗試：

CREATE DEFINER=`root`@`localhost` FUNCTION `addTicket`(UserId int, RaffleId int) RETURNS int(11) 
BEGIN 
    INSERT INTO RaffleTicket(UserId, RaffleId) 
    SELECT userId, raffleId 
    FROM RaffleStatus rs 
    WHERE rs.RaffleId = raffleId 
    AND rs.SoldOut = 0; 
    return rs.SoldOut; 
RETURN 1; 
END 

但它給我的字段列表錯誤1109未知表「RS」。

Answer 1

CREATE DEFINER=`root`@`localhost` FUNCTION `InsertRaffleTicket`(
userId BIGINT, 
raffleId BIGINT 
) RETURNS int 
BEGIN 

DECLARE retValue int; 

select SoldOut into retValue from RaffleStatus where RaffleId = raffleId; 

INSERT INTO RaffleTicket(UserId, RaffleId) 
SELECT userId, raffleId 
FROM RaffleStatus rs 
WHERE rs.RaffleId = raffleId 
AND rs.SoldOut = 0; 

RETURN retValue; 

END