ObjectSet<RuralHouse> result = db.queryByExample(house);
if (result.isEmpty()) {
Owner ow = (Owner) db.queryByExample(rh.getOwner()).get(0);
+ ObjectSet<RuralHouse> orh = db.queryByExample(new RuralHouse(null, ow, null, null, null));
+ for (RuralHouse aa: orh){
+ db.delete(aa);
+ }
db.delete(ow);
ow.addRuralHouse(rh);
db.store(ow);