mysql中declare的问题
如题，我在SQLyog Enterprise中执行如下代码，但是每次都是declare报错；在mysql命令行中也是如此，请问该怎么用declare呢？
代码如下：
CREATE PROCEDURE p8() 
BEGIN 
DECLARE a INT; 
DECLARE b INT; 
SET a = 5; 
SET b = 5; 
select pkid,name,userGroup_desc,parent_id,group_state from T_VSM_SECPOLICY_USERGROUP; 
END;
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 '' at line 3
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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 'DECLARE b INT' at line 1
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Error Code : 1193
Unknown system variable 'a'
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Error Code : 1193
Unknown system variable 'b'
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(35 row(s)returned)
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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 'END' at line 1
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求解，谢谢

------解决方案--------------------
declare cur0 cursor for select pkid from T_VSM_SECPOLICY_USERGROUP; --这里为什么报错？

declare 必须在其它语句之前。
------解决方案--------------------
delimiter //
CREATE PROCEDURE p8()
BEGIN
declare cur0 cursor for select pkid from T_VSM_SECPOLICY_USERGROUP;
DECLARE a INT;
DECLARE b INT;
SET a = 5;
SET b = 5;
END//