以往的存储过程代码（部分）

/*

编写一段程序，将每种玩具的价格提高￥0.5，

直到玩具的平均价格接近$24.5为止。此外，任何玩具的最大价格不应超过$53。

*/

create procedure rise_price()

begin

declare average float(4,2);

declare maxV float(4,2);

select avg(mtoyrate) into average from toys;

select max(mtoyrate) into maxV from toys;

when average <= 24.5 && maxV <= 53 do

update toys set mtoyrate = mtoyrate + 0.5;

select avg(mtoyrate) into average from toys;

select max(mtoyrate) into maxV from toys;

end while;

if average > 24.5 || maxV > 53 then

update toys set mtoyrate = mtoyrate - 0.5;

end;

--执行时

call rise_price();

/*创建一个称为prcCharges的存储过程，它返回某个定单号的装运费用和包装费用。

*/

--表格

mysql> select corderno,mshippingcharges,mgiftwrapcharges from orders;

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

| corderno | mshippingcharges | mgiftwrapcharges |

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

| 000001 | 6 | 1.25 |

| 000002 | 8 | 2 |

| 000003 | 12 | 0 |

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

9 rows in set

create procedure prccharges(in orderno char(6),

out shippingCharges float(4,2),out wrapCharges float(4,2))

begin

select mshippingcharges into shippingCharges from

orders where corderno = orderno;

select mgiftwrapcharges into wrapcharges from orders

where corderno = orderno;

end;

--执行时命令

call prccharges('000001',@pp,@qq);

select @pp,@qq;

--执行结果

mysql> select @pp,@qq;

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

| @pp | @qq |

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

| 6 | 1.25 |

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

1 row in set

/*创建一个称为prcHandlingCharges的过程，它接收定单号并显示经营费用。

提示：经营费用=装运费+礼品包装费

*/

create procedure prcHandLingCharges(in orderno char(6),

out handlingCharges float(4,2))

begin

declare ppp float(4,2);

declare qqq float(4,2);

call prccharges(orderno,ppp,qqq);

set handlingCharges = ppp + qqq;

end;

--执行时命令

call prcHandLingCharges('000001',@qqqq);

select @qqqq;

--执行结果

mysql> select @qqqq;

+-------+

| @qqqq |

+-------+

| 7.25 |

+-------+

1 row in set