MySQL自定义(Function)函数举例，具体代码如下：

mysql>

mysql> delimiter $$

mysql>

mysql> CREATE FUNCTION myFunction

-> (in_string VARCHAR(255),

-> in_find_str VARCHAR(20),

-> in_repl_str VARCHAR(20))

->

-> RETURNS VARCHAR(255)

-> BEGIN

-> DECLARE l_new_string VARCHAR(255);

-> DECLARE l_find_pos INT;

->

-> SET l_find_pos=INSTR(in_string,in_find_str);

->

-> IF (l_find_pos>0) THEN

-> SET l_new_string=INSERT(in_string,l_find_pos,LENGTH(in_find_str),in_repl_str);

-> ELSE

-> SET l_new_string=in_string;

-> END IF;

-> RETURN(l_new_string);

->

-> END$$

Query OK, 0 rows affected (0.00 sec)

mysql>

mysql> delimiter ;

mysql> select myFunction('ABC','A','Z');

+---------------------------+

| myFunction('ABC','A','Z') |

+---------------------------+

| ZBC |

+---------------------------+

1 row in set (0.00 sec)

mysql> drop function myFunction;

Query OK, 0 rows affected (0.00 sec)

mysql>

mysql>

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