MySQL自定义(Function)函数举例

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>

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