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Alex
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 Posted: Mon Nov 06, 2006 9:11 am Post subject: changing bold type to descendent type |
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Is there any support to change an instance of an class to an descendent
class ?
Or do I have to create new descendent class instance copy all the attributes
from the parent class and eventualy the links between other classes and
delete the parent class instance?
Regards
Alex |
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Peter Morris [Droopy eyes
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| Posted: Mon Nov 06, 2006 9:11 am Post subject: Re: changing bold type to descendent type |
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| Quote: | Or do I have to create new descendent class instance copy all the
attributes
from the parent class and eventualy the links between other classes and
delete the parent class instance?
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That one :-)
The fact that you need to do this sounds a bit dodgy. Is it due to
remodelling and you need to evolve the DB or is it a requirement of your
application to change the object?
--
Pete
Blessed are the geek, for they shall public class GeekEarth : Earth {}
====
Audio compression components, DIB graphics controls, ECO extensions,
FastStrings
http://www.droopyeyes.com
==== |
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Alex
Guest
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| Posted: Mon Nov 06, 2006 9:11 am Post subject: Re: changing bold type to descendent type |
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Pete,
It's an requirement, I have a class PotentialClient and for certain
potentialclients I want to store some extra information and some extra
(derived) calculations, I don't want to burden all the potentialclients with
this info.
Any suggestions ?
Thanx
Alex
"Peter Morris [Droopy eyes software]" <pete (AT) NO_droopyeyes_SPAM (DOT) com> schreef
in bericht news:454ef40f$1 (AT) newsgroups (DOT) borland.com...
| Quote: | Or do I have to create new descendent class instance copy all the
attributes
from the parent class and eventualy the links between other classes and
delete the parent class instance?
That one :-)
The fact that you need to do this sounds a bit dodgy. Is it due to
remodelling and you need to evolve the DB or is it a requirement of your
application to change the object?
--
Pete
Blessed are the geek, for they shall public class GeekEarth : Earth {}
====
Audio compression components, DIB graphics controls, ECO extensions,
FastStrings
http://www.droopyeyes.com
====
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Peter Morris [Droopy eyes
Guest
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| Posted: Mon Nov 06, 2006 3:28 pm Post subject: Re: changing bold type to descendent type |
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Hi
Definately! You should use roles instead.
Is a bus driver a different kind of human to a train driver? Ofcourse not,
they are both humans. The difference between them is the role they perform.
[Person] (Person) 1---0..* (Roles) [Role]
Role is abstract.
PotentialClientRole ---|> Role
ClientRole ---|> Role
Now you can make a Person a potential client like so
Person.Roles.Add(TPotentialClientRole.Create(BoldSystem));
The person may have many roles, you could add constraints to make ClientRole
and PotentialClientRole mutually exclusive.
Here's a short article, unfortunately the images are gone but it has some
example code etc. I might write it differently these days as the article is
over 2.5 years old, but I'm sure it's worth having a read.
http://www.howtodothings.com/computers/a866-role-based-programming-in-bold.html
Pete |
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