Re: Object-relational impedence
Date: Thu, 06 Mar 2008 17:39:12 +0000
Bob Badour wrote:
> S Perryman wrote:
>>> 'Match' is cool, but what about more interesting operations like >>> 'project(join(R1,R2)), R1.a1, R2.b3)' where R1 is a set of >>> <c,a1,a2,a3> tuples and R2 is a set of <c, b1,b2,b3> tuples ? How >>> do you express that in your fav OO language ?
>> As I have said on numerous occasions, the semantics of "joins" are an
>> issue for OO (specifically the fact that in OO any of the "values" of
>> c/a1..a3/b1..b3 could be a computational operation and not a data value
>> etc) .
> How is that any different than a relational view? Whether the data is > calculated or stored directly is irrelevant.
I know this should be true, but something in my head keeps screaming "its' not that simple !!!" . :-( :-)
I feel that thoughts of specific impls of both RDBs and OO prog langs are perhaps preventing me from stepping back and seeing things cleanly.
Steven Perryman Received on Thu Mar 06 2008 - 18:39:12 CET