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
This archive was generated by hypermail 2.0.0 : Thu Nov 29 2007 - 06:34:41 EST