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JPA "one to many" relation question

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MikoMax

Post subject: JPA "one to many" relation question

Posted: Mon Feb 04, 2008 10:15 am

Newbie

Joined: Mon Dec 11, 2006 12:16 pm
Posts: 2
Location: Belgium

Hi all,

I'm using JPA with hibernate 3.3 and I'd like to make a one to many/many to one bidirectional relation.

the trouble is that I do not know how to tell JPA I want at least one element in the many side.
-> one TO at least one element relation...

can you help me?

thanks in advance,
Mike.

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farzad

Post subject: Re: JPA "one to many" relation question

Posted: Mon Feb 04, 2008 10:36 am

Expert

Joined: Wed Apr 11, 2007 11:39 am
Posts: 735
Location: Montreal, QC

I am wondering if you could use an interceptor to check this. The interceptor can throw an exception if the collection is empty.

Farzad-

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Irons UK

Post subject:

Posted: Mon Feb 04, 2008 10:42 am

Regular

Joined: Mon Aug 20, 2007 6:47 am
Posts: 74
Location: UK

I don't think you can enforce that with JPA/Hibernate mappings. I'm not sure you can enforce it at the database level either without the use of triggers.

Can you initialise the child relationship in the parent's no-arg constructor?

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