订单存储过程

create proc create_OrderConfrim

 @orderId nvarchar(50),--订单号

 @userId int,---用户编号

 @address nvarchar(255),--收货人地址

 @totalMoney money output--总价

as

   declare @error int

   set @error=0--记录错误

--计算订单的总价(当前用户)

   select @totalMoney=sum([count]*UnitPrice) from Cart inner join Books

   on Cart.BookId=Books.Id

    where Cart.UserId=@userId --向订单主表中插入记录.

   begin transaction

      insert into dbo.Orders(OrderId, OrderDate, UserId, TotalPrice, PostAddress, state) values(@orderId,getdate(),@userId,@totalMoney,@address,0) set @error=@error+@@error --向订单明细表中插入

     insert into dbo.OrderBook(OrderID, BookID, Quantity, UnitPrice)select @orderId,BookId,[Count],UnitPrice from Cart inner join Books on Cart.BookId=Books.Id where Cart.UserId=@userId

   set @error=@error+@@error --删除购物车中的商品项

   delete from Cart where UserId=@userId

   set @error=@error+@@error  

    if @error>0--出现错误了。  

        begin    

           rollback transaction         

        end  

    else  

        begin   

    commit transaction  

     end