hibernate problem

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Omega - 21 Apr 2006 14:37 GMT

I have a problem with Hibernate.
Lets say I have class A, BList and B. They look like this:

class A {

    private long id;
    private BList list;

    get/setXXX();

    otherMethods();
}

class BList {

    private ArrayList<B> bList;

    add/remove/etc.
}

class B {

    some private fields;
}

I would like to transfer those classes into database with two relations: As
and Bs, and Bs would have a foreign key to class A. How can I do that using
hibernate? Should I use <nested-composite-element>?

Thanks in advance

Omega

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Adam Maass - 21 Apr 2006 15:38 GMT

>I have a problem with Hibernate.
> Lets say I have class A, BList and B. They look like this:
[quoted text clipped - 26 lines]
> using
> hibernate? Should I use <nested-composite-element>?

RTFM: http://www.hibernate.org/hib_docs/v3/reference/en/html/

Given this sketch of the problem, I'm having a hard time seeing what you're
gaining by the class BList. Eliminate it, and your mapping problem becomes
basically canonical:

class A {
private Long id;
Set<B> bs;
}

class B {
}

<class name="A" table="A">
....
<set name="bs" table="B">
<key column="A_FK">
<composite-element class="B">
....
</composite-element>
</set>
....
</class>

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Omega - 21 Apr 2006 16:42 GMT

> RTFM: http://www.hibernate.org/hib_docs/v3/reference/en/html/
> Given this sketch of the problem, I'm having a hard time seeing what
> you're gaining by the class BList. Eliminate it, and your mapping
> problem becomes basically canonical:

I know it would be easiest to change the model, but it is a given, it is
rather large and it would be defficult to change it know. Is it any way to
transfer it without changing the model?

Omega

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hibernate problem

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