detach question

[Jean-Baptiste BRIAUD -- Novlog]

Hi the list,

Am i right on the following pseudo code ?

            // Note the detach.
            // getFullById come back with an instance of MyObject from the 
primary key
            final MyObject ooo = detach(getFullById(cc....

            < Here I modify (a lot) ooo but don't wan't the modif to be persist>

                try {
                    cc.beginTransaction();

                    <Here I modify the ooo but I want this modif to be persist, 
not the other one before>

                    cc.merge(ooo);
                    cc.commitTransaction();

                } catch (...) {
                    cc.rollbackTransaction();
                }

Thanks !