MySQL 存储过程的异常处理

mysql>

mysql> delimiter $$

mysql>

mysql> CREATE PROCEDURE myProc

    ->     (p_first_name          VARCHAR(30),

    ->       p_last_name           VARCHAR(30),

    ->       p_city                VARCHAR(30),

    ->       p_description         VARCHAR(30),

    ->       OUT p_sqlcode         INT,

    ->       OUT p_status_message  VARCHAR(100))

    -> BEGIN

    ->

    -> /* START Declare Conditions */

    ->

    ->   DECLARE duplicate_key CONDITION FOR 1062;

    ->   DECLARE foreign_key_violated CONDITION FOR 1216;

    ->

    -> /* END Declare Conditions */

    ->

    -> /* START Declare variables and cursors */

    ->

    ->      DECLARE l_manager_id       INT;

    ->

    ->      DECLARE csr_mgr_id CURSOR FOR

    ->       SELECT id

    ->         FROM employee

    ->        WHERE first_name=p_first_name

    ->              AND last_name=p_last_name;

    ->

    -> /* END Declare variables and cursors */

    ->

    -> /* START Declare Exception Handlers */

    ->

    ->   DECLARE CONTINUE HANDLER FOR duplicate_key

    ->     BEGIN

    ->       SET p_sqlcode=1052;

    ->       SET p_status_message='Duplicate key error';

    ->     END;

    ->

    ->   DECLARE CONTINUE HANDLER FOR foreign_key_violated

    ->     BEGIN

    ->       SET p_sqlcode=1216;

    ->       SET p_status_message='Foreign key violated';

    ->     END;

    ->

    ->   DECLARE CONTINUE HANDLER FOR not FOUND

    ->     BEGIN

    ->       SET p_sqlcode=1329;

    ->       SET p_status_message='No record found';

    ->     END;

    ->

    -> /* END Declare Exception Handlers */

    ->

    -> /* START Execution */

    ->

    ->   SET p_sqlcode=0;

    ->   OPEN csr_mgr_id;

    ->   FETCH csr_mgr_id INTO l_manager_id;

    ->

    ->   IF p_sqlcode<>0 THEN           /* Failed to get manager id*/

    ->     SET p_status_message=CONCAT(p_status_message,' when fetching manager id');

    ->   ELSE

    ->     INSERT INTO employee (first_name,id,city)

    ->     VALUES(p_first_name,l_manager_id,p_city);

    ->

    ->     IF p_sqlcode<>0 THEN     /* Failed to insert new department */

    ->       SET p_status_message=CONCAT(p_status_message,

    ->                            ' when inserting new department');

    ->     END IF;

    ->   END IF;

    ->

    ->   CLOSE csr_mgr_id;

    ->

    -> /* END Execution */

    ->

    -> END$$

Query OK, 0 rows affected (0.02 sec)

 

mysql>

mysql> delimiter ;

mysql> set @myCode = 0;

Query OK, 0 rows affected (0.00 sec)

 

mysql> set @myMessage = 0;

Query OK, 0 rows affected (0.00 sec)

 

mysql>

mysql> call myProc('Jason','Martin','New City','New Description',@myCode,@myMessage);

Query OK, 1 row affected (0.00 sec)

 

mysql>

mysql> select @myCode, @myMessage;

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

| @myCode | @myMessage |

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

| 0       | NULL       |

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

1 row in set (0.00 sec)

 

mysql>

mysql> drop procedure myProc;

Query OK, 0 rows affected (0.00 sec)

 

http://www.oschina.net/code/snippet_54100_27