code: @Override
    public final <T> void updEnt(final Map<String, Object> pRqVs,
      final T pEnt, final String[] pNdFlds) throws Exception {
      throw new Exception("NEI");
    }
docs: <p>Update entity with ID in DB.</p>
  @param <T> entity type
  @param pRqVs request scoped vars
  @param pEnt entity
  @param pNdFlds not null, needed fields, e.g. {"iid", "ver", "stat"} to
  change only order status with optimistic locking
  @throws Exception - an exception