no estimates... still "nearest future" ;-)
On Apr 14, 2008, at 4:52 PM, Borut Bolčina wrote:
Andrus,
what is the "status" of this merge functionality? Any estimates?
Thanks,
Borut
2007/11/29 Andrus Adamchik <[EMAIL PROTECTED]>:
In the nearest future we'll be adding a "merge" method to the
DataContext
that would do exactly what you described here - reattach an already
persistent and possibly modified object to the context. For now the
closest
analog is "localObject", but it will require some hacking. A
reattach method
may look like this:
void reattach(Persistent object) {
// force "modified" on the object
object.setPersistenceState(PersistenceState.MODIFIED);
context.localObject(object.getObjectId(), object);
}
This will do the right thing for objects not changed, but WILL NOT
do the
right thing for the newly inserted objects.
Andrus
On Nov 29, 2007, at 1:33 PM, Detlef Burt wrote:
Hello,
after being able to keep my Data after sending my Objects via JMS
(Thanks Andrus) I now have a problem when I try to write the
Objects back
into the Database.
After sending the Objects to the Client-Application, the Client
changes
some data ( Just a timestamp in my Testcase ) and then sends an
Update-Request to the Server. Due to the fact, that the Client has
no access
to the DataContext or the underlying ObjectStore, the changes made
to the
Object won't be recorded.
After the Server receives the Object, it reconnects the Object to
the
DataContext, thus being able to get a snapshot from the database
or even
create an UpdateQuery.
But I can't go anywhere from here.
Executing the UpdateQuery won't have any effect because Cayenne
doesn't
know what changed.
I also tried to get a Snapshot from the DB, convert my DataObject
to a
DataRow and then create and register the diff of those by myself.
But I
couldn't find anything like that :/
To sum it all up:
- Can I tell Cayenne to replace the Database Contents with the
data from
my Object while retaining the ObjectId ?
- Can I tell Cayenne to "scan" an Object for changes and register
the
differences, so that calling commitChanges will update the Object?
- Or is it possible to create a DataRow from a DataObject so I can
create and register an ObjectDiff ?
NOTE:
When updating the Object, I don't know what class is being updated
and
what properties it has, all I have is my CayennePersistableObject
Baseclass,
which extends CayenneDataObject.
Detlef
