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Help a dumb guy map his relations...

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therealsono

Post subject: Help a dumb guy map his relations...

Posted: Sat Jul 08, 2006 1:45 pm

Newbie

Joined: Mon Jun 26, 2006 2:21 am
Posts: 2

Hello,

I'm stumped as to how to map the following relation, using annotations:

Code:

         |---|
         | A |
         ------  0..1       |---|
         | c  |-------|     | C |
         ------       |   1 -------
                      |-----| a   |
         |---|            1 |     |
         | B |        |-----| b   |
         ------  0..1 |     -------
         | c  |-------|
         ------

Read:

A has one C
B has one C
C has zero or one A, zero or one B

My eternal gratitude to anyone who can tell me the correct @OneToMany annotations for this case, then i'll be able to look at the manual again without losing my mind..

With backreference? Please?

ben(stupid)

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alesj

Post subject:

Posted: Sat Jul 08, 2006 4:58 pm

Expert

Joined: Sat Oct 25, 2003 8:49 am
Posts: 490
Location: Vrhnika, Slovenia

Use @OneToOne.

http://java.sun.com/javaee/5/docs/api/javax/persistence/OneToOne.html

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