mysql怎么调用out参数的存储过程？

call sp_add()

是不是你定义的过程有问题吧，并没有指出返回结果来

像我这样是可以的：

CREATE PROCEDURE sp_add(a int, b int,out c int)

begin

set c=a+ b

end

调用过程：

call sp_add (1,2,@a)

select @a

CREATE PROCEDURE test_pro1(IN username VARCHAR(20),IN loginPwd VARCHAR(20))

BEGIN

INSERT INTO admin(admin.username,PASSWORD)

VALUES(username,loginpwd)

END $

CREATE PROCEDURE test_pro2(IN id INT,OUT NAME VARCHAR(20),OUT phone VARCHAR(20))

BEGIN

SELECT b.name ,b.phone INTO NAME,phone

FROM beauty b

WHERE b.id = id

END $

CREATE PROCEDURE test_pro3(IN birth1 DATETIME,IN birth2 DATETIME,OUT result INT)

BEGIN

SELECT DATEDIFF(birth1,birth2) INTO result

END $

CREATE PROCEDURE test_pro4(IN mydate DATETIME,OUT strDate VARCHAR(50))

BEGIN

SELECT DATE_FORMAT(mydate,'%y年%m月%d日') INTO strDate

END $

CALL test_pro4(NOW(),@str)

如 传入 ：小昭

返回： 小昭 AND 张无忌

DROP PROCEDURE test_pro5 $

CREATE PROCEDURE test_pro5(IN beautyName VARCHAR(20),OUT str VARCHAR(50))

BEGIN

SELECT CONCAT(beautyName,' and ',IFNULL(boyName,'null')) INTO str

FROM boys bo

RIGHT JOIN beauty b ON b.boyfriend_id = bo.id

WHERE b.name=beautyName

END $

CALL test_pro5('柳岩',@str)

DROP PROCEDURE test_pro6

CALL test_pro6(3,5)$

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