存储过程中mysql子查询中的整数

我做了简单的程序只是为了证明

 CREATE PROCEDURE `demo`(demo_int int)
BEGIN
 DECLARE minid INT;
 SELECT min(id) FROM (SELECT id FROM events LIMIT demo_int,9999999999999999) as hoo INTO minid;
END$$

如果我把它改成

LIMIT 1,9999999999999999

它起作用,但是

LIMIT demo_int,9999999999999999

不… 它产生错误

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 'demo_int,9999999999999999) as hoo INTO minid; END' at line 4 (errno: 1064)

有什么线索吗?