public function editaRegistroAcesso(RegistroAcesso $rg)
 {
     $sql = "update registro_acesso set ";
     $sql .= "rgc_fim = '" . $rg->getRgc_fim() . "' ";
     $sql .= "where rgc_id = " . $rg->getRgc_id() . " limit 1";
     echo $sql;
     return $this->execute($sql);
 }