Re: [eclipselink-users] What is the correct wayto remove master-detail r

[Leon Derks <leon.derks@xxxxxxxxxx>]

Hoi Mathias,

Thanks.

Okay, but what is missing in my ORM mapping? 
And what is then the use of cascade = REMOVE?

Leon

Mathias Walter wrote:
> Hi Lean,
>
>   
> > Why is my characteristic not removed?
> >     
>
> Because EclipseLink does not know, if the characteristic object is used by
> any other object. In theory, EclipseLink could know this, if the ORM is
> complete. But sometimes it is not complete and the object could relate to
> any other database object.
>
> Therefore you have to use the PrivateOwned annotation, as Shaun already
> posted. That would solve your problem. Keep it a try!
>
> --
> Kind regards,
> Mathias
>
>   
> > I would expect eclipselink to remove my characteristic when I do 
> > product.remove(characteristic), because of the cascade = REMOVE.
> > Do I have to do entitymanager.remove(characteristic)? And if 
> > so, why do 
> > I have to do both?
> >
> > Leon
> >
> >
> >
> > Shaun Smith wrote:
> >     
> > > Hi Leon,
> > >
> > >    In JPA, to delete an object in a collection you need to 
> > >       
> > remove it from the 
> >     
> > > collection and then call entityManager.remove(..).  
> > >       
> > EclipseLink adds support for 
> >     
> > > orphan management through a relationship defined as 
> > >       
> > "private owned".  If you 
> >     
> > > specify that a collection is private owned then removing an 
> > >       
> > element from the 
> >     
> > > collection and committing your transaction will cause it to 
> > >       
> > be deleted on the 
> >     
> > > database. 
> > >
> > >    For more info see: 
> > >
> > >       
> > http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_(ELUG
> > )#How_to_Use_the_.40PrivateOwned_Annotation
> >     
> > >    Shaun
> > >
> > > Leon Derks wrote:
> > >       
> > > > Hi Tim,
> > > >
> > > > I already tried that, but couldn't get it working.
> > > > I will try it again.
> > > >
> > > > Thank you.
> > > > Leon
> > > >
> > > >
> > > > Tim Hollosy wrote:
> > > >         
> > > > > Leon,
> > > > > Remove it from your list directly, and as long as you have
> > > > > CascadeType.REMOVE set on your relationship it will 
> > > > >           
> > remove it from the
> >     
> > > > > database.
> > > > >
> > > > > Tim
> > > > >
> > > > > On Mon, Jun 2, 2008 at 12:02 PM, Leon Derks 
> > > > >           
> > <leon.derks@xxxxxxxxxx> wrote:
> >     
> > > > >  
> > > > >           
> > > > > > Hello
> > > > > >
> > > > > > I have the follwing Objects:
> > > > > >
> > > > > > Product {
> > > > > > List<Characteristic> characteristics;
> > > > > > List<ImageInfo>imageInfos
> > > > > > }
> > > > > >
> > > > > > Characteristic{
> > > > > > Product product;
> > > > > > }
> > > > > > ImageInfo{
> > > > > > Product product.
> > > > > > }
> > > > > >
> > > > > > But what is the best way to remove a Characteristic object?
> > > > > >
> > > > > > I prefer doing: entityManager.remove(characteristic);
> > > > > > But then the characteristic is still in the List in the 
> > > > > >             
> > Product. Why isn't
> >     
> > > > > > the entity cache automatically updated?
> > > > > > How can I clear the cache manually?
> > > > > >
> > > > > > Leon
> > > > > >
> > > > > >
> > > > > > _______________________________________________
> > > > > > eclipselink-users mailing list
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> > > > > > https://dev.eclipse.org/mailman/listinfo/eclipselink-users
> > > > > >
> > > > > >     
> > > > > >             
> > > > >
> > > > >   
> > > > >           
> > > > _______________________________________________
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> > > >         
> > > --
> > >
> > >
> > > Oracle <http://www.oracle.com>
> > > Shaun Smith | Principal Product Manager, TopLink | +1.905.502.3094
> > > Oracle Fusion Middleware
> > > 110 Matheson Boulevard West, Suite 100
> > > Mississauga, Ontario, Canada L5R 3P4
> > >   
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