sql用事务做添加

alter proc Buy(@ProductNo char(14),@SkuId int,@account nvarchar(20),@buyNumber int) as begin --使用事务 begin tran declare @error int declare @orderNo char(14) declare @amount float select @orderNo=OrderNo from [order] where OrderAccount=@account --查询编号 if(@orderNo is null or @orderNo=’’) begin set @orderNo=CONVERT(varchar(100), GETDATE(), 112)+‘0001’ end —先插入到order_detail表 insert order_detail select @orderNo,@SkuId,@ProductNo,DetailPrice,@buyNumber,a.ProductName from Product a inner join ProductDetail b on a.ProductNo=b.ProdcutNo set @error+=@@ERROR if(@error>0) begin rollback end --往订单表（购物车） select @amount=(Number*Price) from [order] a inner join order_detail b on a.orderNO=B.ORDERNO where A.orderaccount=@account insert [order] select @orderNo,@account,getdate(),‘待付款’,@amount from ProductDetail set @error+=@@ERROR if(@error>0) begin rollback end —库存扣减 declare @sku int select @sku=DetailSku from ProductDetail where ProdcutNo=@ProductNo if(@sku-@buyNumber<0) begin rollback end e