About my previous auto-xxx mail:
When I say it "works perfect" I mean that changes are persisted.
On Thu, 2004-10-07 at 18:50, Martin I. Levi wrote:
> On Wed, 2004-10-06 at 17:30, Armin Waibel wrote:
> > Hi Martin,
> >
> > > If I get an A object (always through ODMG) from the DB, change the field
> > > A.b_id to another valid B id and try to persist, this fails.... or
> > > worse, it does not have any effect. Am i forced to get the B object and
> > > perform an A.set(B) or is there any better way to do this knowing the
> > > id? (I am trying to avoid querying B again)
> >
> > The referenced object B is dominating the FK field b_id in A. This mean
> > if A has no B reference OJB assume that the reference was deleted and
> > set b_id to null. If you lookup A and B was materialized too
> > (auto-retrieve is true in reference-descriptor in A) and then change
> > b_id, OJB get the referenced B and override the changed b_id with the
> > old value.
> > So you have to load the new B object and replace the referenced object in A.
> >
> > regards,
> > Armin
> >
>
> Ok... I tried to do what you said (more or less) but I still have
> problems. I'm going to tell you the scenario that will help for sure. I
> get the A object, change the references (not the embedded objects but
> the Integer objects which map the FK), then I pass this object and the
> transaction to an update method. In that method using Metadata I guess
> which references this object has (*) then I read the new referenced
> objects, load them in the main object and persist... nothing happens!
>
> The interesting point is that if i clone the main object (inside the
> update method), inspect clone's references using Metadata, load new
> referenced objects into the clone and finally I copy clone data into the
> original object: it works perfect. Now i am lost! :)
>
> I post the code just in case.
>
> (*) I do this because this method has to be generic in order to use it
> with many objects which are subclasses of the main class
> (BaseBusinessObject).
>
>
> public final void updateBOtx(BaseBusinessObject bbo,TransactionExt tx)
> throws ComputersServiceImplException,CloneNotSupportedException
> {
> /*notice that if the lines begining with // are uncommented an the
> lines ending in // are commented everything works, if the code is left
> just like it is now... it has no effect.*/
>
> Class boClass;
> MetadataManager mm;
> DescriptorRepository dr;
> ClassDescriptor cld;
> String tableName;
> Vector references;
> //BaseBusinessObject bboClone;
>
> //bboClone=bbo.cloneIt();
>
> try
> {
> logger.debug("Triggering object update");
> if(!tx.isOpen())
> {
> logger.debug("Opening transaction...");
> tx = (TransactionExt) odmg.newTransaction();
> tx.begin();
> }
>
> //boClass=bboClone.getClass();
> boClass=bbo.getClass();//
> mm = MetadataManager.getInstance();
> dr = mm.copyOfGlobalRepository();
> cld = dr.getDescriptorFor(boClass);
> //tableName = cld.getFullTableName();
>
> references = cld.getObjectReferenceDescriptors();
> for (int i = 0; i < references.size(); i++)
> {
> Class referencedClass;
> BaseBusinessObject referencedObject;
> String id;
> ObjectReferenceDescriptor reference;
>
> reference = (ObjectReferenceDescriptor)
> references.get(i);
> referencedClass=reference.getItemClass();
>
> //id=BeanUtils.getProperty((Object)bboClone,(String)reference.getForeignKeyFields().firstElement());
>
> id=BeanUtils.getProperty((Object)bbo,(String)reference.getForeignKeyFields().firstElement());//
> logger.debug("Reference found! -
> "+(String)reference.getForeignKeyFields().firstElement()+"="+id+"
> class="+referencedClass.getName());
> referencedObject=getBOtx(referencedClass,id,tx);
>
> //BeanUtils.setProperty(bboClone,reference.getAttributeName(),referencedObject);
>
> BeanUtils.setProperty(bbo,reference.getAttributeName(),referencedObject);
> }
> //bbo.copy(bboClone);
>
> tx.lock(bbo,Transaction.WRITE);
>
> logger.debug("Transaction checkpoint...");
> tx.checkpoint();
> }
> catch (Exception ex)
> {
> tx.abort();
> throw new ComputersServiceImplException("Exception thrown
> while updating BO in ComputerServiceImpl.updateBO()",ex.getCause());
> }
> }
>
>
>
>
>
--
Saludos,
Martin I. Levi
Centre Tecnol�gic de Transferenci�ncia de Calor
Universitat Polit�cnica de Catalunya
www.cttc.upc.edu
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