1、在数据库中创建如下图的两张表
创建表及写入数据的代码如下:
create table price
(
num nvarchar(20) not null,
name nvarchar(20) not null,
price float not null
)
insert into price(num,name,price)
values('001','苹果',4.5),
('002','菠萝',5.0),
('003','芒果',6.5)
create table raise_price
(
num nvarchar(20) not null,
price float not null
)
insert into raise_price(num,price)
values('001',-0.5),
('002',0.5),
('003',1.0)
2、然后创建存储过程(里面使用游标处理事务)如下:
CREATE PROCEDURE price_proc
AS
declare @temp_num nvarchar(20),@temp_price float
declare mycursor cursor for select num,price from raise_price
open mycursor
fetch next from mycursor into @temp_num,@temp_price
while(@@fetch_status = 0)
begin
Update price set price=price+@temp_price where num=@temp_num
fetch next from mycursor into @temp_num,@temp_price
end
close mycursor
deallocate mycursor
GO
最后执行存储过程:
exec price_proc
得到如下结果
对比上图,可以看出价格发生了变化。