mysql 存储过程 into 赋值问题

第一个问题

SELECT cdaytime INTO tcdaytime,uid  INTO tcuid FROM sz_app_daylogin AS d WHERE uid=iuid;

为什么在一个 SELECT 里面 into 2此赋值就出错
错误信息
-------------
Undeclared variable: uid

第二个问题错误信息
-------------------------
Error Code : 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'begin
update sz_app_daylogin set cnum=cnum+1,cdaytime=tcdaytime where uid=iui' at line 11

以下是关于这个错误的SQL

DELIMITER $$



CREATE

    PROCEDURE `login_updatedaylogin`(IN iuid INT,IN tnowtime INT,IN righttime INT)



BEGIN

DECLARE tcdaytime INT DEFAULT 0;

DECLARE tcuid INT DEFAULT 0;



SELECT cdaytime INTO tcdaytime FROM sz_app_daylogin AS d WHERE d.uid=iuid;

SELECT d.uid  INTO tcuid FROM sz_app_daylogin AS d WHERE d.uid=iuid;

IF  tcuid>0 THEN

	BEGIN

		IF tcdaytime=righttime

		BEGIN

			UPDATE sz_app_daylogin SET cnum=cnum+1,cdaytime=tcdaytime WHERE uid=iuid;#连续加1

		END;

		ELSE

		BEGIN

			IF tcdaytime=tnowtime

			BEGIN

				#同一天登录，已经加1，忽略   

			END;

			ELSE

			BEGIN

				UPDATE sz_app_daylogin SET cnum=0,cdaytime=tcdaytime WHERE uid=iuid;#不连续，清零

			END;

			END IF;

		END

		END IF;

	END;

ELSE

BEGIN

      INSERT INTO sz_app_daylogin(`uid`,`cdaytime`,`cnum`) VALUES (iuid,tnowtime,0);

END;

END IF;

END;





DELIMITER ;