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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Windows Ada database support.
Date: Wed, 8 Dec 2004 20:43:19 +0100
Organization: cbb software GmbH
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Date: 2004-12-08T20:43:19+01:00
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On Wed, 8 Dec 2004 15:58:44 +0000 (UTC), Georg Bauhaus wrote:

> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
>: Again, there are two different questions. I have already formulated them in
>: another post:
>: 
>: 1. Why relations should be handled?
>: 2. Why Ada cannot handle them?
>: 
>: To dismiss Ada.Database.Relational, we have to answer 1=yes, 2=no,
>: because...
> 
> Ada the language does not have what SQL processors do have.

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.

> You would have to build some sort of DKQL processor in your
> Ada.Databases.Relational. Go ahead :-)

>: I would like to view it as a distributed system
>: and get rid of the notion of DB altogether. Only persistent objects. No
>: I/O, just memory-mappings. [ Clearly, in any short term perspective it is
>: an utopia. ]
> 
> Say all you have is persistent objects. What kind of query do you
> have if you want to know about 2 or more objects?

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.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de