MySQL存储过程带in和out参数
最简单的例子:
[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)
一个稍微复杂的例子:
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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 |
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+----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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$$
DELIMITER ;
mysql> CREATE PROCEDURE sp_GetMaxNumber (IN v_bmh VARCHAR(6), OUT v_MaxNo INT)
-> BEGIN
-> START TRANSACTION;
-> UPDATE t_BillNo
-> SET SaleNo = IFNULL(SaleNo,0)+1
-> WHERE bmh = v_bmh;
-> IF @@error_count = 0 THEN
-> BEGIN
-> SELECT Saleno INTO v_MaxNo FROM t_BillNo WHERE bmh = v_bmh;
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-> COMMIT;
-> END;
-> ELSE
-> BEGIN
-> ROLLBACK;
-> SET v_MaxNo = 0;
-> END;
-> END IF;
-> END$$
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)
