I have an existing code base that is written around a mvc framework. The
code consists of actionbeans that call database methods to read data and build
out objects (e.g. UserRecord etc). The framework presents the data and
lets the user edit values and then when the actionbean is called (during a form
submit) it processes updating the database.
I would like to reimplement the database work using Cayenne.
My question is I do not want to expose the action beans (which are only around
during request scope not session) to have to deal with calling Cayenne. I was
working to adjust my database class to handle the Cayenne calls. These methods
take an argument of an object to write to the database or update for example:
public boolean insertNewEvent(Event event) {
write event record to database
}
My code is beginning to look like this using cayenne:
public boolean InsertNewEvent(Event event) {
DataContext context = this.getContext();
Event ev = (Event)context.newObject(Event.class);
ev.setEventdate(event.getEventdate());
ev.setNotice(event.getNotice());
ev.setPkey(event.getPkey());
ev.setTimeend(event.getTimeend());
ev.setTimestart(event.getTimestart());
ev.setCategory(event.getCategory());
ev.setNotice(event.getNotice());
ev.setPkey(-1);
context.commitChanges();
return true;
}
I am finding myself creating an equivalent object using the context.newObject
call and copying the fields from my Event object to the one created by the call
to context.newObject. Is there a better way to do this. For instance if I
have been passed an event object that was not created with Cayenne context call
how do I make Cayenne pick it up and use it for the commit? Or should I have
the action bean which is creating this new object call the context.newObject
and get back an event from cayenne (which I really was hoping not to do (did
not want to litter my action bean code with calls to cayenne)).
Is there a way to take an event object and make the cayenne context aware of it
so it can write or update it without copying the fields one by one?
Thanks,
Tony
