From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Subject: Re: Windows Ada database support.
Date: Wed, 8 Dec 2004 02:24:25 +0000 (UTC)
Date: 2004-12-08T02:24:25+00:00 [thread overview]
Message-ID: <cp5okp$gks$1@a1-hrz.uni-duisburg.de> (raw)
In-Reply-To: 1jrbh30djhwuh$.cpwm02mv7d1d.dlg@40tude.net
Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
: On Tue, 7 Dec 2004 15:49:36 +0000 (UTC), Georg Bauhaus wrote:
:
:> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
:>
:>: I think that this is a shortcoming of the very concept of a relational
:>: view. Relation is not an array. Period.
:>
:> Who says that a relation is an array?
:
: Nobody. The problem is that we need arrays, or more generally, ordered
: containers. This is the way the most people think about tables.
Hm. If at the DB level you ask,
SELECT S.key, T.foo, T.bar from S, T
WHERE (S.key BETWEEN 100 AND 200)
AND T.foo = S.key
ORDER BY S.key
Then you have in Ada.Container terms,
function Floor (Container : Map;
Key : Key_Type) return Cursor;
function Ceiling (Container : Map;
Key : Key_Type) return Cursor;
where
S.key >= 100 can be made the floor
and
S.key <= 200 can be made the ceiling.
: They do not
: think about them in terms of relations.
You mean they do not think about the relations between records,
for example? Well, yes, but how could this be overcome using
another language? A fair amount of referential integrity can
be "extracted" from an ER diagram using standard means. If this
way of defining tables in a database is not standard, do you think
that another standard, Ada, is going to help?
: Why an application that need to store data, should care about that? Sorry,
: I still cannot understand it.
1/ other applications may (have to) modify your data without notice.
3/ storing data might take time. RDB or not, I need to know this
2/ you might need backups and secure storage. This is provided by
good RDBMSs.
: Do you care much about ferromagnetism when
: you write a file onto the hard drive?
I certainly do. In particular when the disks are 5 years old
and not part of a well maintained RAID. ;-)
-- Georg
next prev parent reply other threads:[~2004-12-08 2:24 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-24 12:31 Windows Ada database support Mark Doherty
2004-11-24 15:04 ` Marius Amado Alves
2004-11-24 18:35 ` Pascal Obry
2004-11-24 19:17 ` Alex R. Mosteo
2004-11-24 19:30 ` Dmitry A. Kazakov
2004-11-24 22:32 ` Ching Bon Lam
2004-11-25 1:03 ` David Botton
2004-11-25 17:50 ` Warren W. Gay VE3WWG
2004-11-26 9:15 ` Dmitry A. Kazakov
2004-11-26 18:36 ` David Botton
2004-11-27 8:59 ` Dmitry A. Kazakov
2004-11-28 0:46 ` David Botton
2004-11-28 9:51 ` Dmitry A. Kazakov
2004-11-28 10:23 ` Pascal Obry
2004-11-28 11:03 ` Dmitry A. Kazakov
2004-11-28 14:38 ` Martin Dowie
2004-11-28 16:51 ` Marius Amado Alves
2004-11-28 19:50 ` Martin Dowie
2004-11-28 20:49 ` Christopher Browne
2004-11-28 17:29 ` Dmitry A. Kazakov
2004-11-28 17:47 ` Marius Amado Alves
2004-11-28 18:56 ` Dmitry A. Kazakov
2004-12-06 14:57 ` Warren W. Gay VE3WWG
2004-11-28 18:45 ` Pascal Obry
2004-11-28 19:13 ` Dmitry A. Kazakov
2004-11-28 20:04 ` Pascal Obry
2004-11-29 9:04 ` Dmitry A. Kazakov
2004-11-29 10:07 ` Adrien Plisson
2004-11-29 11:00 ` Alex R. Mosteo
2004-11-29 13:12 ` Frank Piron
2004-12-01 16:19 ` Pascal Obry
2004-12-02 10:37 ` Marius Amado Alves
2004-12-02 10:58 ` Frank Piron
2004-12-03 2:50 ` John B. Matthews
2004-11-28 20:36 ` Marius Amado Alves
2004-11-29 1:40 ` Georg Bauhaus
2004-11-29 10:30 ` Marius Amado Alves
2004-11-29 1:28 ` Georg Bauhaus
2004-11-29 8:53 ` Dmitry A. Kazakov
2004-11-29 11:09 ` Georg Bauhaus
2004-11-29 12:01 ` Dmitry A. Kazakov
2004-11-29 14:07 ` Georg Bauhaus
2004-11-29 18:04 ` Dmitry A. Kazakov
2004-11-29 22:05 ` Georg Bauhaus
2004-11-30 11:00 ` Dmitry A. Kazakov
2004-11-30 13:46 ` Ole-Hjalmar Kristensen
2004-11-30 15:04 ` Dmitry A. Kazakov
2004-11-30 16:09 ` Georg Bauhaus
2004-11-30 16:07 ` Georg Bauhaus
2004-11-30 18:52 ` Dmitry A. Kazakov
2004-11-30 21:10 ` Georg Bauhaus
2004-12-01 9:11 ` Dmitry A. Kazakov
2004-11-29 12:56 ` Marius Amado Alves
2004-11-29 13:26 ` Dmitry A. Kazakov
2004-11-29 15:02 ` Frank Piron
2004-11-29 15:58 ` Marius Amado Alves
2004-11-29 18:16 ` Dmitry A. Kazakov
2004-11-30 7:14 ` Frank Piron
2004-12-06 14:48 ` Warren W. Gay VE3WWG
2004-12-06 16:29 ` Dmitry A. Kazakov
2004-12-06 17:52 ` Warren W. Gay VE3WWG
2004-12-06 19:44 ` Georg Bauhaus
2004-12-06 20:49 ` Dmitry A. Kazakov
2004-12-07 5:16 ` Warren W. Gay VE3WWG
2004-12-07 10:29 ` Dmitry A. Kazakov
2004-12-07 15:49 ` Georg Bauhaus
2004-12-07 21:29 ` Dmitry A. Kazakov
2004-12-08 2:24 ` Georg Bauhaus [this message]
2004-12-08 9:05 ` Dmitry A. Kazakov
2004-12-08 10:03 ` Ole-Hjalmar Kristensen
2004-12-08 10:56 ` Dmitry A. Kazakov
2004-12-08 11:19 ` Marius Amado Alves
2004-12-08 12:51 ` Frank Piron
2004-12-08 13:43 ` Dmitry A. Kazakov
2004-12-08 13:41 ` Dmitry A. Kazakov
2004-12-08 16:09 ` Georg Bauhaus
2004-12-08 19:46 ` Dmitry A. Kazakov
2004-12-09 12:20 ` Georg Bauhaus
2004-12-09 12:59 ` Dmitry A. Kazakov
2004-12-08 15:58 ` Georg Bauhaus
2004-12-08 19:43 ` Dmitry A. Kazakov
2004-12-09 11:58 ` Georg Bauhaus
2004-12-09 13:27 ` Dmitry A. Kazakov
2004-12-09 18:58 ` Georg Bauhaus
2004-12-10 10:22 ` Dmitry A. Kazakov
2004-12-10 14:28 ` Georg Bauhaus
2004-12-10 15:14 ` Dmitry A. Kazakov
2004-12-08 15:52 ` Georg Bauhaus
2004-12-08 20:22 ` Dmitry A. Kazakov
2004-12-09 12:12 ` Georg Bauhaus
2004-12-09 12:59 ` Dmitry A. Kazakov
2004-12-09 18:45 ` Georg Bauhaus
2004-12-09 12:22 ` Ole-Hjalmar Kristensen
2004-12-09 14:03 ` Dmitry A. Kazakov
2004-12-10 20:47 ` Simon Wright
2004-11-25 2:18 ` bubble
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