private void buscarPatente(){
        try {
            //Registrar Driver de base datos
            Class.forName("oracle.jdbc.OracleDriver");
            String baseDatos = "jdbc:oracle:thin:@190.215.50.5:1433:orcl";
            //conectarse con la base de datos
            Connection cnn = DriverManager.getConnection(baseDatos, "seccion122","seccion122");
            if(cnn != null){
                String sql = "Select * from vehiculos where patente = '" + txtPatente.getText() + "'";
                Statement stm = cnn.createStatement();
                ResultSet rstVehiculo = stm.executeQuery(sql);
                if(rstVehiculo.next()){
                    btnGrabar.setText("Actualizar");
                    btnEliminar.setEnabled(true);
                    txtMarca.setText(rstVehiculo.getString("marca"));
                    txtModelo.setText(rstVehiculo.getString("modelo"));
                    txtMotor.setText(String.valueOf(rstVehiculo.getInt("cc")));
                }else{
                    txtMarca.setText("");
                    txtModelo.setText("");
                    txtMotor.setText("");
                    btnGrabar.setText("Ingresar");
                    btnEliminar.setEnabled(false);
                }

                rstVehiculo.close();
                stm.close();
            }else{
                System.out.println("No se pudo conectar");
            }
            cnn.close();
        } catch (Exception ex) {
            System.out.println("Error " + ex.toString());
        }

    }