/** @return \DateTime */
 public function getCreatedAt()
 {
     return $this->venueHistoryModel->getCreatedAt();
 }
 public function ensureChangedFlagsAreSet(VenueHistoryModel $venuehistory)
 {
     global $DB;
     // do we already have them?
     if (!$venuehistory->isAnyChangeFlagsUnknown()) {
         return;
     }
     // load last.
     $stat = $DB->prepare("SELECT * FROM venue_history WHERE venue_id = :id AND created_at < :at " . "ORDER BY created_at DESC");
     $stat->execute(array('id' => $venuehistory->getId(), 'at' => $venuehistory->getCreatedAt()->format("Y-m-d H:i:s")));
     // Apply what we know!
     if ($stat->rowCount() == 0) {
         $venuehistory->setChangedFlagsFromNothing();
     } else {
         while ($venuehistory->isAnyChangeFlagsUnknown() && ($lastHistoryData = $stat->fetch())) {
             $lastHistory = new VenueHistoryModel();
             $lastHistory->setFromDataBaseRow($lastHistoryData);
             $venuehistory->setChangedFlagsFromLast($lastHistory);
         }
     }
     // Save back to DB
     $sqlFields = array();
     $sqlParams = array('id' => $venuehistory->getId(), 'created_at' => $venuehistory->getCreatedAt()->format("Y-m-d H:i:s"), 'is_new' => $venuehistory->getIsNew() ? 1 : 0);
     if ($venuehistory->getTitleChangedKnown()) {
         $sqlFields[] = " title_changed = :title_changed ";
         $sqlParams['title_changed'] = $venuehistory->getTitleChanged() ? 1 : -1;
     }
     if ($venuehistory->getDescriptionChangedKnown()) {
         $sqlFields[] = " description_changed = :description_changed ";
         $sqlParams['description_changed'] = $venuehistory->getDescriptionChanged() ? 1 : -1;
     }
     if ($venuehistory->getLatChangedKnown()) {
         $sqlFields[] = " lat_changed = :lat_changed ";
         $sqlParams['lat_changed'] = $venuehistory->getLatChanged() ? 1 : -1;
     }
     if ($venuehistory->getLngChangedKnown()) {
         $sqlFields[] = " lng_changed = :lng_changed ";
         $sqlParams['lng_changed'] = $venuehistory->getLngChanged() ? 1 : -1;
     }
     if ($venuehistory->getCountryIdChangedKnown()) {
         $sqlFields[] = " country_id_changed = :country_id_changed ";
         $sqlParams['country_id_changed'] = $venuehistory->getCountryIdChanged() ? 1 : -1;
     }
     if ($venuehistory->getAreaIdChangedKnown()) {
         $sqlFields[] = " area_id_changed = :area_id_changed ";
         $sqlParams['area_id_changed'] = $venuehistory->getAreaIdChanged() ? 1 : -1;
     }
     if ($venuehistory->getAddressChangedKnown()) {
         $sqlFields[] = " address_changed = :address_changed ";
         $sqlParams['address_changed'] = $venuehistory->getAddressChanged() ? 1 : -1;
     }
     if ($venuehistory->getAddressCodeChangedKnown()) {
         $sqlFields[] = " address_code_changed = :address_code_changed ";
         $sqlParams['address_code_changed'] = $venuehistory->getAddressCodeChanged() ? 1 : -1;
     }
     if ($venuehistory->getIsDuplicateOfIdChangedKnown()) {
         $sqlFields[] = " is_duplicate_of_id_changed  = :is_duplicate_of_id_changed ";
         $sqlParams['is_duplicate_of_id_changed'] = $venuehistory->getIsDuplicateOfIdChangedKnown() ? 1 : -1;
     }
     if ($venuehistory->getIsDeletedChangedKnown()) {
         $sqlFields[] = " is_deleted_changed = :is_deleted_changed ";
         $sqlParams['is_deleted_changed'] = $venuehistory->getIsDeletedChanged() ? 1 : -1;
     }
     $statUpdate = $DB->prepare("UPDATE venue_history SET " . " is_new = :is_new, " . implode(" , ", $sqlFields) . " WHERE venue_id = :id AND created_at = :created_at");
     $statUpdate->execute($sqlParams);
 }