code: public Iterable<DContact> queryByCompanyName(Object parent, java.lang.String companyName) {
      return queryByField(parent, DContactMapper.Field.COMPANYNAME.getFieldName(), companyName);
    }
docs: query-by method for field companyName
  @param companyName the specified attribute
  @return an Iterable of DContacts for the specified companyName