一，朋友建立儲存函式報錯。
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

報錯如下：
[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、檢視建立函式的功能是否開啟：
先看下，log_bin_trust_function_creators有沒有開啟
mysql> show variables like '%func%';
+---------------------------------+-------+
| Variable_name | Value |
+---------------------------------+-------+
| log_bin_trust_function_creators | OFF |
+---------------------------------+-------+
1 row in set (0.00 sec)

如果Value處值為OFF，則需將其開啟。
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儲存函式，需要特殊的間隔符來區分，還要用DELIMITER來標示，還有select ... into ... 已經賦值了，set就是多餘的，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，執行如下，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> 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$$
Query OK, 0 rows affected (0.01 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>

後補一下帶int的函式
delimiter $$
CREATE FUNCTION first_func(param1 varchar(5),parmam2 varchar(5),param3 varchar(10))
RETURNS TINYINT
BEGIN
RETURN 1;
END

PS：mysql的儲存函式或者儲存過程麼有直接可以除錯的工具，所以需要手工仔細分析檢視，應用中儘量少用儲存過程或者儲存函式。

MySQL儲存函式錯誤[Err] 1064的除錯記錄

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