borland.public.delphi.oodesign

From: Alfredo Novoa <alfredo_at_ncs.es>
Date: 25 May 2003 17:00:50 -0700
Message-ID: <e4330f45.0305251600.5d89799a_at_posting.google.com>

If someone wants to see something about the state of the data management theory knowledge in the OO coders community you might be interested in taking a look at this group.

Perhaps you will be as amazed as I was.

For instance:

update employees set salary = salary * 1.05 where (country = 'Spain'  or country = 'Brazil') and hiredate < ToDate('1/1/2003');

Is a very bad approach because it is not encapsulated, and you must do things like this in your application code:

---

equal1 := EqualToCriteria.Create('country', 'Spain'); equal2 := EqualToCriteria.Create('country', 'Brazil');

equal1.AddOrCriteria(equal2);

lessthan := LessThanCriteria.Create('hiredate', '1/1/2003');

updateCriteria.ForClass('Employee');
updateCriteria.AddAttribute(salary, salary * 1.05);

updateCriteria.AddSelectEqualTo(equal1); updateCriteria.AddSelectLessThan(lessthan);

updateCriteria.Perform;

---

But if you are depressed don't look at this group :-)

The really sad thing is that a lot of newcomers are "learning" the "new" approach on that group.

Regards
  Alfredo Received on Mon May 26 2003 - 02:00:50 CEST