Re: Mixing OO and DB
Date: Tue, 11 Mar 2008 22:30:24 -0300
Message-ID: <47d73235$0$4054$9a566e8b_at_news.aliant.net>
David Cressey wrote:
> "Marshall" <marshall.spight_at_gmail.com> wrote in message
> news:485c487b-90d4-477f-a26a-10a280110d29_at_e6g2000prf.googlegroups.com...
>
>>On Mar 8, 6:07 pm, Robert Martin <uncle..._at_objectmentor.com> wrote:
>>
>>>On 2008-03-06 15:37:56 -0600, topmind <topm..._at_technologist.com> said:
>>>
>>>>>Each small group of classes becomes a little roll-your-own data access
>>>>>and manipulation scheme that is perfectly tuned for it's very specific
>>>>>purpose.
>>>
>>>>Which is over-kill for the task-level.
>>>
>>>Do you have proof that it's overkill? Do you have any objective
>>>measurements that it's overkill? Or it is just your own opinion. I
>>>mean, if it works for you that's great, but don't force your own
>>>opinions on everyone else <grin>
>>
>>This is a fallacious argument. You're proposing extra effort without
>>justification. The idea that, in the absence of evidence either way,
>>topmind's proposal of not putting in that effort is on equal footing
>>with yours doesn't hold. Extra effort requires justification. What
>>you are saying is, "hey, we don't know if this work has any value
>>or not, so doing it is just as justified as not doing it."
>>
>>Burden of proof and all.
>>
>>
>>>It is very common for programmers to manipulate data into forms that
>>>are particularly convenient for the application they are writing.
>>>Databases are seldom in that form since (for one thing) they must
>>>usually serve many different and competing applications.
>>
>>(I'm going to just label the above as bogus without justification.
>>It's late and I'm lazy.)
> > Not so fast, Marshall. > > There's a germ of truth in his comment. The difference is between fine > tuning for a special purpose and broad tuning for multiple purposes.
Which is why both logical independence and physical independence are so important. Do you honestly think any currently proposed non-relational data model has any hope of challenging the relational model on either?
The relational model allows for both fine tuning and broad tuning without changing the logical interface to the data.
[snip] Received on Wed Mar 12 2008 - 02:30:24 CET