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From "Patrick Linskey" <plins...@bea.com>
Subject RE: [VOTE] change primary key value?
Date Wed, 21 Feb 2007 08:03:19 GMT
> I guess that being able to do this is technically a bug in 
> OpenJPA, but please don't fix it!

To ensure that this doesn't change (at least without an option to remain
compatible), it'd be useful if you could create a test case that asserts
this capability.

Also, as with any bulk update, remember that the EntityManager-level
cache is bypassed in this scenario.

-Patrick

-- 
Patrick Linskey
BEA Systems, Inc. 

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> -----Original Message-----
> From: roger.keays [mailto:roger.keays@ninthavenue.com.au] 
> Sent: Tuesday, February 20, 2007 11:51 PM
> To: open-jpa-dev@incubator.apache.org
> Subject: Re: [VOTE] change primary key value?
> 
> 
> Hi Craig,
> 
> Thanks for the reply.
> 
> Craig L Russell wrote:
> > 
> >> Is there a way to change the primary key of an entity in 
> OpenJPA? The
> >> expection below doesn't fill me with hope...
> > 
> > The JPA specification 2.1.4 says that the application must 
> not change  
> > the value of a primary key, but the specific behavior is 
> not defined.  
> > So OpenJPA is spec compliant.
> > 
> That's what I was worried about. Actually, I was able to implement the
> behaviour I needed by using a bulk UPDATE to change the key, 
> and making sure
> the foreign keys were set up correctly (i.e. CASCADE). I 
> guess that being
> able to do this is technically a bug in OpenJPA, but please 
> don't fix it!
> 
> 
> > That said, there are cases I've seen where changing a 
> primary key is  
> > useful. So I would not oppose a proposal to add the feature 
> to OpenJPA.
> > 
> > By the way, JDO doesn't prohibit it; there is a specific optional  
> > feature to allow this. But an implementation has to choose 
> to support  
> > it.
> > 
> Adding it to OpenJPA would be a nice start, although adding 
> it to the JPA
> spec would be better (along with the rest of the JDO 2.0 that is!)
> 
> Cheers,
> 
> Roger
> 
> >
> >  <4|false|0.9.6-incubating>
> > org.apache.openjpa.persistence.InvalidStateException: Attempt to  
> > change a
> > primary key field of an instance that already has a final object  
> > id. Only
> > new, unflushed instances whose id you have not retrieved can have  
> > their
> > primary keys changed. FailedObject:
> > figbird.lists.entities.Email-info@sunburnt.com.au
> >
> >
> > org.apache.openjpa.kernel.StateManagerImpl.assertNoPrimaryKeyChange 
> > (StateManagerImpl.java:1819)
> >
> > org.apache.openjpa.kernel.StateManagerImpl.settingStringField 
> > (StateManagerImpl.java:1800)
> >     figbird.lists.entities.Email.pcSetemail(Email.java)
> >     figbird.lists.entities.Email.setEmail(Email.java:36)
> >    ...
> > -- 
> > View this message in context: http://www.nabble.com/change-primary- 
> > key-value--tf3244417.html#a9018988
> > Sent from the open-jpa-dev mailing list archive at Nabble.com.
> >
> 
> Craig Russell
> Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
> 408 276-5638 mailto:Craig.Russell@sun.com
> P.S. A good JDO? O, Gasp!
> 
> 
>  
> 
> 
> -- 
> View this message in context: 
> http://www.nabble.com/change-primary-key-value--tf3244417.html
> #a9076663
> Sent from the open-jpa-dev mailing list archive at Nabble.com.
> 
> 

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