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alexmartins
 Post subject: composite keys mapping using xdoclet
PostPosted: Mon Oct 25, 2004 9:59 pm 
Newbie

Joined: Thu May 20, 2004 5:40 pm
Posts: 10
Location: Rio de Janeiro - Brazil
Hello!
Is there a way to perform composite keys mapping using xdoclet?
I can't find anything about.

Thanks.
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david
 Post subject:
PostPosted: Wed Oct 27, 2004 7:58 pm 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 7:19 pm
Posts: 2364
Location: Brisbane, Australia
Yes - put the field markup into the composite key class on the key properties. Integrated composite keys are not supported (atleast the last time I looked at it).
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ko5tik
 Post subject:
PostPosted: Wed Nov 03, 2004 7:03 am 
Senior
Senior

Joined: Wed Aug 27, 2003 4:08 am
Posts: 178
Location: Wiesbaden, Germany
david wrote:
Yes - put the field markup into the composite key class on the key properties. Integrated composite keys are not supported (atleast the last time I looked at it).


Hi Gavin,
I read it in dtd that:

"A composite key may be modelled by a java class with a property for each
key column. The class must implement java.io.Serializable and reimplement equals()
and hashCode()."

How do we implement integrated key? Declare class properties to
key properties?
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david
 Post subject:
PostPosted: Wed Nov 03, 2004 7:40 pm 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 7:19 pm
Posts: 2364
Location: Brisbane, Australia
Example of integrated composite keys (Doco) which is not the recommended approach:

Code:
For a table with a composite key, you may map multiple properties of the class as identifier properties. The <composite-id> element accepts <key-property> property mappings and <key-many-to-one> mappings as child elements.

<composite-id>
        <key-property name="medicareNumber"/>
        <key-property name="dependent"/>
</composite-id>

Your persistent class must override equals() and hashCode() to implement composite identifier equality. It must also implements Serializable.

Unfortunately, this approach to composite identifiers means that a persistent object is its own identifier. There is no convenient "handle" other than the object itself.


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