I always understood that the weakness of Object Databases was that they provided no general ad hoc query language like SQL (or QUEL) though there was no a priori reason why they couldn't. The way relational databases were grounded in 1st order predicate logic (FOPC) seemed to give them an advantage which Object Databases despite announcements and languages to the contrary never quite manageed to overcome. I do know that the Relational Model is based on the logic of Frege (1879), the predicate logic, while the object model harks back to the IS_A hierarchies underpinning the logic of Aristotle (300 BC). I checked out the orbtech URL but found nothing about languages, logic or even taxonomies. So give us more evidence that the world has changed! It has been long announced but has not happened. Frege rules.
Peter > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Patrick K. O'Brien > Sent: 26 March 2005 22:28 > To: Lloyd Kvam > Cc: '[email protected]'; [EMAIL PROTECTED] > Subject: [DB-SIG] Re: [Pycon2005-attendees] Pycon2005 and database divide > (ODB vs relational DB) > > Lloyd Kvam wrote: > [snip] > > > > Has the world changed? Is it now easy to apply set theory predicates > > (or some alternative theory) to ODB data? Should "normal" applications > > be managing "objects" rather than "data"? > > Yes. Start here --> http://orbtech.com/blog/schevo/pycon2005 > > -- > Patrick K. O'Brien > Orbtech http://www.orbtech.com > Schevo http://www.schevo.org > Pypersyst http://www.pypersyst.org > > _______________________________________________ > DB-SIG maillist - [email protected] > http://mail.python.org/mailman/listinfo/db-sig _______________________________________________ DB-SIG maillist - [email protected] http://mail.python.org/mailman/listinfo/db-sig
