mysql中if-elesif-endif使用

DROP PROCEDURE
IF EXISTS text;
CREATE PROCEDURE text (OUT rtn INT)
BEGIN
DECLARE LoginId INT DEFAULT 0;

SET rtn = 1;

IF LoginId = 3 THEN
SET rtn = 2;

ELSEIF LoginId = 0 THEN
SET rtn = 3;

ELSE
SET rtn = 4;

END
IF;

END