private void deletePersons() throws PersistenceException {
_db.begin();
OQLQuery oqlclean = _db.getOQLQuery("SELECT object FROM "
+ ManyPersonKeyGen.class.getName() + " object WHERE object.id < $1");
oqlclean.bind(Integer.MAX_VALUE);
QueryResults enumeration = oqlclean.execute();
while (enumeration.hasMore()) {
_person1 = (ManyPersonKeyGen) enumeration.next();
_stream.println("Retrieved object: " + _person1);
_db.remove(_person1);