Re: Clean Object Class Design -- What is it?

Bob Badour wrote:
> >How is generating a key better than the ODBMS equivalent of a
> >system-generated Oid?
>
> The non-relational ODBMS always creates the OID and requires one to use
 the
> OID
Implementations differ among object database systems. Well-designed systems do not expose OIDs.

With which product have you been experimenting?

> The OID approach encourages designers to ignore other identifying
> attributes, which can sometimes lead to disastrous duplication.

Some object database systems keep track of all objects that are instantiated from storage. This safely prevents duplication and even allows automatic distinction between "new" and "update" calls.

How does your "mapping objects to columns" (domains) approach take care of object identity?

Kind regards,
Carl

---
Carl Rosenberger
db4o - database for objects - http://www.db4o.com