MySQL存儲過程帶in和out參數

MySQL存儲過程帶in和out參數   最簡單的例子:

[html] 
mysql> DELIMITER $$  
mysql> USE test $$  
Database changed  
mysql> DROP PROCEDURE IF EXISTS `sp_add`$$  
Query OK, 0 rows affected (0.00 sec)  
  
mysql> CREATE PROCEDURE sp_add(a INT, b INT,OUT c INT)  
    -> BEGIN   
    -> SET c=a+ b;  
    -> END$$  
Query OK, 0 rows affected (0.00 sec)  
  
mysql> DELIMITER ;  

[html] 
mysql> CALL sp_add (1,2,@c);  
Query OK, 0 rows affected (0.00 sec)</p><p>mysql> SELECT @c;  
+------+  
| @c   |  
+------+  
|    3 |  
+------+  
1 row in set (0.00 sec)

[html] 
mysql> show create table t_BillNo;  
+----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+  
| Table    | Create Table                                                                                                                                                                        |  
+----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+  
| t_BillNo | CREATE TABLE `t_billno` (  
  `SaleNo` bigint(20) DEFAULT NULL,  
  `bmh` varchar(20) DEFAULT NULL  
) ENGINE=InnoDB DEFAULT CHARSET=utf8 CHECKSUM=1 DELAY_KEY_WRITE=1 ROW_FORMAT=DYNAMIC |  
+----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+  
1 row in set (0.00 sec)  
  
mysql> select * from t_BillNo;  
+--------+------+  
| SaleNo | bmh  |  
+--------+------+  
|      1 | 2    |  
|      4 | 3    |  
|      4 | 5    |  
|      7 | 7    |  
|     12 | 8    |  
+--------+------+  
5 rows in set (0.00 sec)  
  
mysql>   
mysql> DELIMITER $$  
mysql> USE test $$  
Database changed  
mysql> DROP PROCEDURE IF EXISTS `sp_GetMaxNumber`$$  
Query OK, 0 rows affected (0.01 sec)  
  
DELIMITER $$  
USE test $$  
DROP PROCEDURE IF EXISTS `sp_GetMaxNumber`$$  
CREATE PROCEDURE sp_GetMaxNumber (IN v_bmh VARCHAR(6), OUT v_MaxNo INT)  
BEGIN  
    START TRANSACTION;  
    UPDATE t_BillNo  
    SET SaleNo = IFNULL(SaleNo,0)+1   
    WHERE bmh = v_bmh;  
    IF @@error_count = 0 THEN  
        BEGIN  
          SELECT Saleno INTO v_MaxNo FROM t_BillNo WHERE bmh = v_bmh;  
        COMMIT;  
        END;  
    ELSE  
        BEGIN  
             ROLLBACK;  
             SET v_MaxNo = 0;  
        END;  
    END IF;  
END$$  
DELIMITER ;  
  
mysql> CREATE PROCEDURE sp_GetMaxNumber (IN v_bmh VARCHAR(6), OUT v_MaxNo INT)  
    -> BEGIN  
    -> START TRANSACTION;  
    -> UPDATE t_BillNo  
    -> SET SaleNo = IFNULL(SaleNo,0)+1   
    -> WHERE bmh = v_bmh;  
    -> IF @@error_count = 0 THEN  
    -> BEGIN  
    ->   SELECT Saleno INTO v_MaxNo FROM t_BillNo WHERE bmh = v_bmh;  
    -> COMMIT;  
    -> END;  
    -> ELSE  
    -> BEGIN  
    ->      ROLLBACK;  
    ->      SET v_MaxNo = 0;  
    -> END;  
    -> END IF;  
    -> END$$  
Query OK, 0 rows affected (0.00 sec)  
  
mysql> DELIMITER ;  
mysql>   
  
mysql> call sp_GetMaxNumber(8,@v_MaxNo);  
Query OK, 0 rows affected (0.00 sec)  
  
mysql> select @v_MaxNo;  
+----------+  
| @v_MaxNo |  
+----------+  
|       12 |  
+----------+  
1 row in set (0.00 sec)