create proc createorder
@orderid nvarchar(50),--訂單號
@userid int,--使用者編號
@address nvarchar(255),--收貨人位址
@totalmoney money output --總金額
as begin
declare @error int
set @error=0
begin transaction
--計算總價
select @totalmoney=sum([count]*unitprice)from cart
inner join books on cart.bookid=books.id
where userid=@userid
set @error=@@error+@error
--向訂單主表中插入資料
insert into orders(orderid,orderdate,userid,totalprice,postaddress,[state])
values(@orderid,getdate(),@userid,@totalmoney,@address,0)
set @error=@@error+@error
--向訂單明細表中插入資料
insert into 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
--刪除購物車表中的資料
delete from cart where userid=@userid
set @error=@@error+@error
--判斷錯誤，執行事務
if @error>0
begin
rollback transaction
endelse
begin
commit transaction
endend
--rollback transaction
--commit transaction
--primary key(id) identity(1,1)
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