/**
  * execute and get the last insert id
  *
  * @param string $sql statement (INSERT INTO ...)
  *
  * @return int the last insert id or false if there is an error 
  */
 protected function updateAndGetLastId($sql)
 {
     if ($inserted = $this->update($sql)) {
         $inserted = $this->da->lastInsertId();
     }
     return $inserted;
 }