Deleting an instance from a Collection using update.

[CASERO Jaime <JC...@covansys.com>]

Hello all,

            I have several One-To-Many relations among my entities. I
expected that when I remove an instance from the collection, and update
the collection owner, the first one would be removed from the DB. But
the instance is still there. 

Searching the manual I discovered a propietary extension, by OpenJPA,
called "ElementDependent", specially designed for this purpose. I still
getting the same results.

 

            Is there any special setting needed to enable
"ElementDependent"? Can anyone confirm this feature support? If yes, a
simple example would be very appreciated.

 

            Thanks In Advance, regards.

 

Jaime Casero
 
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-----------------------------

Re: Deleting an instance from a Collection using update.

[Craig L Russell <Cr...@Sun.COM>]

Hi,

On Jul 19, 2007, at 6:23 AM, CASERO Jaime wrote:

> Hello all,
>
>             I have several One-To-Many relations among my entities. I
> expected that when I remove an instance from the collection, and  
> update
> the collection owner, the first one would be removed from the DB. But
> the instance is still there.
>
> Searching the manual I discovered a propietary extension, by OpenJPA,
> called "ElementDependent", specially designed for this purpose. I  
> still
> getting the same results.

Yes, if you have annotated the collection with ElementDependent, then  
removing the instance from the collection should delete the instance  
from the database.
>
>             Is there any special setting needed to enable
> "ElementDependent"? Can anyone confirm this feature support? If yes, a
> simple example would be very appreciated.

I don't know of any reason it wouldn't work. But I've not used it  
myself.

Craig
>
>             Thanks In Advance, regards.
>
> Jaime Casero
>
> Confidentiality Statement:
>
> This message is intended only for the individual or entity to which  
> it is addressed. It may contain privileged, confidential  
> information which is exempt from disclosure under applicable laws.  
> If you are not the intended recipient, please note that you are  
> strictly prohibited from disseminating or distributing this  
> information (other than to the intended recipient) or copying this  
> information. If you have received this communication in error,  
> please notify us immediately by return email.
> -----------------------------

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!