Re: Entity and Identity

From: Tegiri Nenashi <>
Date: Mon, 20 Jul 2009 09:45:06 -0700 (PDT)
Message-ID: <>

On Jul 20, 8:51 am, "Walter Mitty" <> wrote:
> ... O-R mapping problem ...

A persistent topic indeed (pun intended).

A conventional wisdom is that object encapsulation hides its field values (state), while relation exposes tuple attributes. Instead, objects are equipped with some nebulous behavior. I suggest that until we successfully formalize the latter not much progress is expected. Each object method is a function, and function is a relation constrained with functional dependency. So, if we map a "naked" object into a relation, then the encapsulated counterpart should map into a set of relations... Received on Mon Jul 20 2009 - 18:45:06 CEST

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