Re: Object-relational impedence
From: Dmitry A. Kazakov <mailbox_at_dmitry-kazakov.de>
Date: Tue, 4 Mar 2008 17:36:24 +0100
Message-ID: <4bza4t1lmhj9.1734ger7g3zac$.dlg@40tude.net>
>
> So no-one ever says "we should be able to get that stuff out of the xyz
> application and combine it with our data so that we can..."!
Date: Tue, 4 Mar 2008 17:36:24 +0100
Message-ID: <4bza4t1lmhj9.1734ger7g3zac$.dlg@40tude.net>
On Tue, 4 Mar 2008 15:41:40 +0000, Eric wrote:
> On 2008-03-04, Dmitry A. Kazakov <mailbox_at_dmitry-kazakov.de> wrote:
>> On Mon, 3 Mar 2008 23:03:41 +0000, Eric wrote: >> >>> No, RDBs partition data so that it is sensibly and easily available to >>> any possible application. So if you use OO you are saying "there will >>> never be any other application that will need my data". >> >> No, it is engineering which says so. It translates as "put the requirements >> first," or simpler "pigs do not fly."
>
> So no-one ever says "we should be able to get that stuff out of the xyz
> application and combine it with our data so that we can..."!
You should plan this use case in advance. That would be a requirement. A system can only do things it was designed for. (This applies to RDBMS as well). For each application exist things it cannot do. That implies: either A) there will never be any other application that will ask to do these, or B) the application is incorrect (= does not fulfill the requirements).
-- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.deReceived on Tue Mar 04 2008 - 10:36:24 CST