mysql存储函数只返回一个值。要开发返回多个值的存储过程，需要使用带有INOUT或OUT参数的存储过程。

咱们先来看一个orders表它的结构：

mysql> desc orders;
+----------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------+-------------+------+-----+---------+-------+
| orderNumber | int(11) | NO | PRI | NULL | |
| orderDate | date | NO | | NULL | |
| requiredDate | date | NO | | NULL | |
| shippedDate | date | YES | | NULL | |
| status | varchar(15) | NO | | NULL | |
| comments | text | YES | | NULL | |
| customerNumber | int(11) | NO | MUL | NULL | |
+----------------+-------------+------+-----+---------+-------+
7 rows in set

然后嘞，咱们来看一个存储过程，它接受客户编号，并返回发货(shipped)，取消(canceled)，解决(resolved)和争议(disputed)的订单总数(多个结果集)：

DELIMITER $$
 
CREATE PROCEDURE get_order_by_cust(
 IN cust_no INT,
 OUT shipped INT,
 OUT canceled INT,
 OUT resolved INT,
 OUT disputed INT)
BEGIN
 -- shipped
 SELECT
 count(*) INTO shipped
 FROM
 orders
 WHERE
 customerNumber = cust_no
 AND status = 'Shipped';
 
 -- canceled
 SELECT
 count(*) INTO canceled
 FROM
 orders
 WHERE
 customerNumber = cust_no
 AND status = 'Canceled';
 
 -- resolved
 SELECT
 count(*) INTO resolved
 FROM
 orders
 WHERE
 customerNumber = cust_no
 AND status = 'Resolved';
 
 -- disputed
 SELECT
 count(*) INTO disputed
 FROM
 orders
 WHERE
 customerNumber = cust_no
 AND status = 'Disputed';
 
END

其实，除IN参数之外，存储过程还需要4个额外的OUT参数：shipped, canceled, resolved 和 disputed。 在存储过程中，使用带有count函数的select语句根据订单状态获取相应的订单总数，并将其分配给相应的参数。按着上面的sql，我们如果要使用get_order_by_cust存储过程，可以传递客户编号和四个用户定义的变量来获取输出值。执行存储过程后，我们再使用SELECT语句输出变量值：

+----------+-----------+-----------+-----------+
| @shipped | @canceled | @resolved | @disputed |
+----------+-----------+-----------+-----------+
| 22 | 0 | 1 | 1 |
+----------+-----------+-----------+-----------+
1 row in set