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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: Windows Ada database support.
Date: Thu, 9 Dec 2004 11:58:06 +0000 (UTC)
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Date: 2004-12-09T11:58:06+00:00
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Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
: 
: But you can translate into SQL. Why Ada.Database.Relational.Foo cannot call
: My_ Fancy_DB.Execute ("BAZ ...")? I do not propose to write a new DB
: engine.

This brings us back to the original questions :-)

: Why should I query? It is for untyped tables. If I have an object at hand
: then I know its type and so everything I can do with it. If I don't, then I
: have another object, a container that refers to my object. That container
: again has a type and that provides operations to access its elements.

Relations. Records In DB system, as well as records in Ada have components
which can be updated.  Relations between 2 or more objects may thus depend
on time.  However, an object's type cannot reflect this, because types
are static.  You could associate one different type with each possible
combination of component values in your program...