Вот функция проверки уникальности function checkUniquety($form_data){ if(isset($form_data['city_id']) && isset($form_data['street_id']) && isset($form_data['number'])){ $DBC=DBC::getInstance(); $q='SELECT COUNT(id) AS cnt FROM '.DB_PREFIX.'_'.$this->table_name.' WHERE city_id='.(int)$form_data['city_id']['value'].' AND street_id='.(int)$form_data['street_id']['value'].' AND number='.(int)$form_data['number']['value']; $stmt=$DBC