复制代码 代码如下:

mysql>

mysql> delimiter $$

mysql>

mysql> CREATE PROCEDURE myProc()

-> MODIFIES SQL DATA

-> BEGIN

-> DECLARE l_status VARCHAR(20);

->

-> CALL myProc1(l_status);

-> IF l_status='Duplicate Entry' THEN

-> SELECT CONCAT('Warning: using existing definition for location ') AS warning;

-> END IF;

-> END$$

Query OK, 0 rows affected (0.00 sec)

mysql>

mysql> CREATE PROCEDURE myProc1(OUT out_status VARCHAR(30))

-> BEGIN

-> set out_status = 'Duplicate Entry';

-> END$$

Query OK, 0 rows affected (0.00 sec)

mysql>

mysql>

mysql> delimiter ;

mysql> call myProc();

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

| warning |

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

| Warning: using existing definition for location |

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

1 row in set (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

mysql> drop procedure myProc;

Query OK, 0 rows affected (0.00 sec)

mysql> drop procedure myProc1;

Query OK, 0 rows affected (0.00 sec)

mysql>

mysql>