Re: The wisdom of the object mentors (Was: Searching OO Associations with RDBMS Persistence Models)
Date: Thu, 08 Jun 2006 13:34:41 GMT
Robert Martin wrote:
> On 2006-06-01 03:48:55 +0200, J M Davitt <jdavitt_at_aeneas.net> said:
>> Using file systems to make your point is a very poor choice. Take a >> file, copy it over there. Identical content, different paths. Which >> is "real?" Which is a copy? Which one should I modify if I want >> my changes to persist? How do Suzie and Bob and Joey and Ron know >> which is the one I scribbled in? What's keeping track of that? A >> file system? No way! >> >> These, and other, questions become de minimis in the relational model.
> Are you suggesting that RDBs cannot have duplicate rows, or even
> duplicate tables?
Duplicate rows in the same table are absolutely prohibited.
Duplicate tables? Like two tables named CUSTOMER? Not in the same database.
If you think I was suggesting that the same value can't appear in more than one attribute, you missed the point.
> In any case, would you rather that your laptop prevented you from making
> copies of your files?
What's the point of making a copy? Increased entropy? Received on Thu Jun 08 2006 - 15:34:41 CEST