A relationship to a static Entity that is not saved to the db (or part of the EOModel)
A relationship to a static Entity that is not saved to the db (or part of the EOModel)
- Subject: A relationship to a static Entity that is not saved to the db (or part of the EOModel)
- From: Stefan Foulis <email@hidden>
- Date: Tue, 06 Jul 2004 01:54:00 +0200
I have the following scenario:
There is an EO Entity built in EOModeler, lets call the Class "A" and
its instances "Ax". Every Ax can be in one of 5 different states. These
states ("S", "Sx") have some additional member variables, like a String
holding the name of the state. These member variables never change and
are known at development time.
So instead of saving these states ("Sx") as usual EnterpriseObjects in
the database and defining them as read-only I'd like to create them in
the sourcecode, never creating a table for them in the database. One of
their member variables would be an Integer, the primary key.
Every "Ax" has an Integer aswell, the foreign key. It is saved in the
database along with other data.
Now there should be a method in "A" called state(); that returns the
corresponding state object instance "Sx" and setState(State newState);
that sets its foreign key according to the state object given as parameter.
"S" should have a method that returns all "Ax"'s that are in that state.
Has anyone got an idea how this can be accomplished (without making the
foreign key in "A" directly visible) ?
I hope I was able to describe this scenatio in an understandable
fashion... but feel free to ask any questions if the problem isn't clear.
Thanks for any help.
stefan
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