/**
  * Request a record from the DB by searchColumn+searchValue. Success if returnColumn value is NULL.
  * @param string $daoName
  * @param string $searchValue
  * @param string $returnColumn
  * @param string $searchColumn
  * @param string $message
  */
 public function assertDBNull($daoName, $searchValue, $returnColumn, $searchColumn, $message)
 {
     if (self::checkDoLocalDBTest()) {
         CiviDBAssert::assertDBNull($this, $daoName, $searchValue, $returnColumn, $searchColumn, $message);
     }
 }