public function gravaRegistroAcesso(RegistroAcesso $rg)
 {
     $sql = "insert into registro_acesso (";
     $sql .= "rgc_usuario,";
     $sql .= "rgc_exercicio,";
     $sql .= "rgc_inicio,";
     $sql .= "rgc_fim";
     $sql .= ") values (";
     $sql .= "" . $rg->getRgc_usuario() . ",";
     $sql .= "" . $rg->getRgc_exercicio() . ",";
     $sql .= "'" . $rg->getRgc_inicio() . "',";
     $sql .= "'" . $rg->getRgc_fim() . "')";
     return $this->executeAndReturnLastID($sql);
 }