RE: Object Creation in ozone

[Falko Braeutigam <falko@smb-tec.com>]

On Fri, 11 Aug 2000, Knapp, Robert (CAP, CMC) wrote:
> >%_Thanks!  Your explanation answers about 1/2 the questions floating around
> my head. :)

Hmmm... 30 lines and it answers "1/2 the questions"... ?!?! :( :) Not that
good, I think. What are the other 1/2 questions? ;)


Falko

> RobK
> 
> 
> --------
> Good questions! ;)
> 
> IMO it is not possible to swap between different ODMG databases without
> changing to much code no matter if they "fully ODMG compliant" or not. For
> example Objectivity, the only commercial OODBMS that I have a license for,
> claims to support ODMG. In fact, the database classes have to extend a
> special
> base class an all method have to call a fetch() method. Both is explicitely
> ruled out by ODMG.
> 
> And, the actual API is just one part of the ODMG spec. Another (very
> important) part is the definition of the underlying object model. This part
> is
> way to unrestricted in the current version 3.0. For example, the ODMG object
> model assumes that objects are activated on the client. (for historical
> reasons, I think) but it's not strickly defined somewhere. ozone is based on
> a
> single instance architecture where objects live inside the server. This
> difference is very important for the application architecture because it
> influences performance and transactional behaviour but ODMG is completely
> unaware of this.
> 
> However, even if it does not allow to re-use 100% of the code, programming
> against the ODMG interface makes it easier to port applications (even more
> if
> you keep in mind the above mentioned restrictions of ODMG) and to re-use the
> knowledge of the programmers.
> 
> The ozone ODMG interface is there and it works. It tries to be as ODMG
> compliant
> as possible. I don't know how it works for real world applications. So any
> experiences are welcome. ;)
> 
> 
> Falko
> -- 
> ______________________________________________________________________
> Falko Braeutigam                              mailto:falko@smb-tec.com
> SMB GmbH                                        http://www.smb-tec.com
> 

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______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com