navicat不能创建函数

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第一次写MySQL FUNCTION，一直报错，

Err] 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 '`company_id` int) RETURNS varchar(20) CHARSET utf8
BEGIN

本来的函数：

CREATE DEFINER=`33323`@`%` FUNCTION `createSaleCode`(`benginStr` varchar,`company_id` int) RETURNS varchar(20) CHARSET utf8BEGIN  DECLARE nearnum VARCHAR(20);     DECLARE nowdatepre VARCHAR(20);   DECLARE numout VARCHAR(20);     SELECT a.sale_code INTO nearnum FROM d_sale a WHERE a.company_id = company_id ORDER BY a.sale_id DESC limit 1;     SELECT concat(extract(year_month from now()),LPAD(extract(day from now()), 2, 0)) INTO nowdatepre;   IF locate(nowdatepre,nearnum)>0     THEN          set numout = nearnum +1;        ELSE          set numout = concat(beginStr,nowdatepre,'00001');      END IF;  RETURN numout;END

这段函数在Navicat上边执行不起来，在多次尝试之后将代码修改为以下：

delimiter $$CREATE DEFINER=`12212`@`%` FUNCTION createSaleCode(benginStr varchar(20),company_id int(11) ) RETURNS varchar(20) CHARSET utf8BEGIN  DECLARE nearnum VARCHAR(20);    DECLARE nowdatepre VARCHAR(20);    DECLARE numout VARCHAR(20);     SELECT a.sale_code INTO nearnum FROM d_sale a WHERE a.company_id = company_id ORDER BY a.sale_id DESC limit 1;    SELECT concat(extract(year_month from now()),LPAD(extract(day from now()), 2, 0)) INTO nowdatepre;    IF locate(nowdatepre,nearnum)>0     THEN          set numout = nearnum +1;        ELSE          set numout = concat(beginStr,nowdatepre,'00001');      END IF;  RETURN numout;END$$delimiter ;

问题解决。

默认情况下，delimiter是分号;。

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