public void replace(ISet<long> replaceable, long replacement)
{
ITrackDao trackDao = new NHibernateDaoFactory().getTrackDao();
Track substitue = trackDao.GetById(replacement, true);
ISession s = NHibernateSessionManager.Instance.GetSession();
IList<Track> tracks = s.CreateQuery("from Track t where t.Id in (:idList)").SetParameterList("idList", replaceable).List<Track>();
IList<Einsatz> updateableEinsaetze = s.CreateQuery("from Einsatz e where e.Track in (:tracks)")
.SetParameterList("tracks", tracks)
.List<Einsatz>();
foreach(Einsatz einsatz in updateableEinsaetze)
einsatz.Track = substitue;
trackDao.commitChanges();
foreach(Track track in tracks)
trackDao.delete(track);
trackDao.commitChanges();
}