一，朋友创建存储函数报错。 CREATE DEFINER=`root`@`localhost` FUNCTION `stuff`( f_old varchar(1000),f_start int,f_length int,f_replace varchar(1000) ) RETURNS varchar(2000) CHARSET utf8 BEGIN return replace(f_old,substring(f_old,f_start,f_length),f_replace); END
[SQL] create FUNCTION f_Int2IP (ip bigint) RETURNS varchar(15) BEGIN DECLARE re varchar(15) default ‘‘; SELECT concat(‘.‘,CAST(ip/id as char)),ip%id into re,ip from( SELECT 16777216 as id UNION ALL SELECT 65536 UNION ALL SELECT 256 UNION ALL SELECT 1) a; set RETURN STUFF(re,1,1,‘‘); END
报错如下： [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 ‘varchar)),ip%id into re,ip from( SELECT 16777216 as id UNION ALL SEL‘ at line 4
二、查看创建函数的功能是否开启： 先看下，log_bin_trust_function_creators有没有开启 mysql> show variables like ‘%func%‘; +---------------------------------+-------+ | Variable_name | Value | +---------------------------------+-------+ | log_bin_trust_function_creators | OFF | +---------------------------------+-------+ 1 row in set (0.00 sec)
如果Value处值为OFF，则需将其开启。 mysql> set global log_bin_trust_function_creators=1; Query OK, 0 rows affected (0.00 sec)
mysql> show variables like ‘%func%‘; +---------------------------------+-------+ | Variable_name | Value | +---------------------------------+-------+ | log_bin_trust_function_creators | ON | +---------------------------------+-------+ 1 row in set (0.00 sec) mysql>
三，分析 mysql存储函数，需要特殊的间隔符来区分，还要用DELIMITER来标示，还有select ... into ... 已经赋值了，set就是多余的，所以修改如下： DELIMITER $$ DROP FUNCTION IF EXISTS test.stuff$$ CREATE FUNCTION test.`stuff`( f_old VARCHAR(1000),f_start INT,f_length INT,f_replace VARCHAR(1000) ) RETURNS VARCHAR(2000) BEGIN RETURN REPLACE(f_old,SUBSTRING(f_old,f_start,f_length),f_replace); END$$
DELIMITER $$ DROP FUNCTION IF EXISTS test.f_Int2IP$$ CREATE FUNCTION `test`.`f_Int2IP`(ip BIGINT) RETURNS VARCHAR(2000) BEGIN DECLARE re VARCHAR(2000) DEFAULT ‘‘; SELECT CONCAT(‘.‘,CAST(ip/id AS CHAR)) AS restr,ip%id INTO re ,ip FROM( SELECT 16777216 AS id UNION ALL SELECT 65536 UNION ALL SELECT 256 UNION ALL SELECT 1) a; RETURN stuff(re,1,1,‘,‘); END$$ DELIMITER ;
四，执行如下，都OK。 mysql> use test; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A
Database changed mysql> DELIMITER $$ mysql> DROP FUNCTION IF EXISTS test.stuff$$ Query OK, 0 rows affected (0.00 sec)
mysql> mysql> DELIMITER $$ mysql> DROP FUNCTION IF EXISTS test.f_Int2IP$$ Query OK, 0 rows affected (0.00 sec)
mysql> CREATE FUNCTION `test`.`f_Int2IP`(ip BIGINT) -> RETURNS VARCHAR(2000) -> BEGIN -> DECLARE re VARCHAR(2000) DEFAULT ‘‘; -> SELECT CONCAT(‘.‘,CAST(ip/id AS CHAR)) AS restr,ip%id INTO re ,ip -> FROM( -> SELECT 16777216 AS id -> UNION ALL SELECT 65536 -> UNION ALL SELECT 256 -> UNION ALL SELECT 1) a; -> RETURN stuff(re,1,1,‘,‘); -> END$$ Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER ; mysql>
后补一下带int的函数 delimiter $$ CREATE FUNCTION first_func(param1 varchar(5),parmam2 varchar(5),param3 varchar(10)) RETURNS TINYINT BEGIN RETURN 1; END
