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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Windows Ada database support.
Date: Fri, 10 Dec 2004 11:22:22 +0100
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Date: 2004-12-10T11:22:22+01:00
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On Thu, 9 Dec 2004 18:58:45 +0000 (UTC), Georg Bauhaus wrote:

> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
>  
>: You have to modify all UPDATE
>: statements if just a new column is added.
> 
> Nope.

>: But data without semantics is a
>: garbage.
> 
> Data with fixed semantics is inflexible :-)

Flexible garbage is still garbage. Honestly, I prefer rigid garbage, it is
predictable. Who knows where a flexible one might leak into! (:-))

>: I could derive new types from old bases and throw out
>: old representations:
> 
> unless they carry some important information from the old design
> still needed in other applications.

No, I can always do it as long as the new implementation is conform to the
semantics of T'Class.

>:> 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...
>: 
>: 1. No application uses all possible combinations. They have very concrete
>: things to do.
> 
> For example, they react to different value that an object has in time?

Where is any problem? Doesn't sin(x) react to any value of x whenever it be
called?

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