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many-to-one and cascade delete

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Smoke

Post subject: many-to-one and cascade delete

Posted: Thu Feb 14, 2008 11:26 am

Newbie

Joined: Tue Oct 23, 2007 6:41 am
Posts: 6

Hi forum,

I need your help with many-to-one relation: I have many-to-one relation and I would like to force hibernate to create real database "on delete cascade" contraint. I know I can add cascade="delete" and hibernate will call extra delete command, but I would like yo have real database constraint because I thing it is more effective.
How can I achive it?

Thanks for your advice.

Smoke

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sjhyam

Post subject: Re: many-to-one and cascade delete

Posted: Thu Feb 14, 2008 3:43 pm

Senior

Joined: Fri Jun 01, 2007 12:41 pm
Posts: 121

Check this example from Hibernate Book, section 8.3.5 Database constraints.

Code:

<class name="Item" table="ITEM">
...
<set name="bids" cascade="save-update, delete">
<key column="ITEM_ID" on-delete="cascade"/>
<one-to-many class="Bid"/>
</set>
</class>

Now your database generate ON DELETE CASCADE constraint as on-delete="delete" is given to column ITEM_ID

Thanks

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Smoke

Post subject:

Posted: Fri Feb 15, 2008 2:17 am

Newbie

Joined: Tue Oct 23, 2007 6:41 am
Posts: 6

Yes, I read it. But how can I do it from many-to-one side? We don't have corresponding "<set ...><one-to-many...." definition because the definition is needless for our bussiness logic.

Thanks

Smoke

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