public function alterar(Atividade $obj)
{
$strSQL = "UPDATE ADM_ATV_ATIVIDADES SET ";
$strSQL .= "ATV_Descricao = '" . $obj->getDescricao() . "', ";
$strSQL .= "ATV_ExigeData = '" . $obj->getExigeData() . "', ";
$strSQL .= "ATV_Status = '" . $obj->getStatus() . "' ";
$strSQL .= "WHERE ATV_ID = " . $obj->getId() . " ";
return Db::getInstance()->executar($strSQL);
}