cayenne-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From emre.yil...@htr.com.tr
Subject Re: Object migrates between DataDomains
Date Wed, 12 Apr 2006 08:01:36 GMT
Hi Andrus ,

I tested DeepMergeOperation. Merged object on targetContext (anotherObject) is created as
I desired with its relations but  I observe actually anotherObject is not created physically
on database .I used the targetContext.commitChanges() to create on database but not create
it.What is the reason of this or how can commit created anotherObject on targetContext.


----- Orjinal Mesaj -----
Kimden: Andrus Adamchik 
Tarih: Tuesday, April 11, 2006 17:53
Konu: Re: Object migrates between DataDomains
Kime: cayenne-user@incubator.apache.org

> Yeah, default mechanism is "lazy" in that it assumes that 
> related  
> objects can be resolved from the database on demand. Copying 
> a  
> subgraph of new objects is a bit more tricky. In 1.2 you can 
> try  
> using  org.objectstyle.cayenne.util.DeepMergeOperation for 
> your  
> purpose. Something like this:
> 
> DataContext srcContext, targetContext;
> DataObject object;
> 
> ClassDescriptor descriptor =
>      
> targetContext.getEntityResolver().getClassDescriptor("MyEntity");
> DataObject anotherObject = new 
> DeepMergeOperation(targetContext).merge 
> (object, descriptor);
> 
> DeepMergeOperation merges everything that is attached to a 
> given  
> object and is already resolved in memory. If you need to 
> implement  
> different logic, you can write your own version using  
> DeepMergeOperation as a template. An example of a different 
> graph  
> traversal termination logic is ObjectDetachOperation that is 
> based on  
> a preset tree of relationships.
> 
> Andrus
> 
> On Apr 11, 2006, at 5:50 PM, emre.yilmaz@htr.com.tr wrote:
> 
> > Hi,
> >
> > Thank you for help. I make the changes as you say but I 
> observe the  
> > DataContext.localObject(..) not set the relations (forign 
> key  
> > id's).Can you help me for migrating
> > objects with its relations through DataDomains.
> >
> > ----- Orjinal Mesaj -----
> > Kimden: Andrus Adamchik <andrus@objectstyle.org>
> > Tarih: Monday, April 10, 2006 11:55
> > Konu: Re: Object migrates between DataDomains
> > Kime: cayenne-user@incubator.apache.org
> >
> >>
> >> On Apr 10, 2006, at 11:48 AM, emre.yilmaz@htr.com.tr wrote:
> >>
> >>> Hi,
> >>>
> >>> Is there a easy way to migrate created objects from one
> >> DataDomain
> >>> to other DataDomain.
> >>>
> >>> Thank you...
> >>
> >>
> >> Technically DataObject belongs to a DataContext, so we should be
> >> speaking about moving objects between DataContexts (that in turn
> >> can
> >> belong to different DataDomains). This is done with
> >> DataContext.localObject(..)
> >>
> >> http://objectstyle.org/confluence/display/CAYDOC/Moving+Objects
> >> +Between+Contexts
> >>
> >> Of course object mappings have to be compatible in both domains
> >> involved.
> >>
> >> Andrus
> >>
> >>
> >
> 
> 

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message