private Vehicle update(Vehicle vehicle) {
    template.update(
        "UPDATE vehicles SET manufacturer = ?, model = ? WHERE id = ?",
        vehicle.getManufacturer(),
        vehicle.getModel(),
        vehicle.getId());

    return vehicle;
  }
  private Vehicle insert(Vehicle vehicle) {
    SimpleJdbcInsert insert =
        new SimpleJdbcInsert(template).withTableName("vehicles").usingGeneratedKeyColumns("id");

    SqlParameterSource parameters =
        new MapSqlParameterSource()
            .addValue("manufacturer", vehicle.getManufacturer())
            .addValue("model", vehicle.getModel());

    Number id = insert.executeAndReturnKey(parameters);
    vehicle.setId(id.intValue());

    return vehicle;
  }