httpmethod json:这段删除的存储过程谁帮我解释一下?? 菜鸟求助

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if exists (select 1
from sysobjects
where id = object_id('dbo.up_DeleteOrders')
and type = 'P')
drop procedure dbo.up_DeleteOrders
go

create procedure dbo.up_DeleteOrders @OrderID varchar(10) as
begin
delete from OrderDetails where OrderID=@OrderID
delete from Orders where OrderID=@OrderID
end
--exec up_DeleteOrders @OrderID=17
go

你这样说 我不是更菜