code: @Override
  	public void removeByCD_CN(long commerceDiscountId, long classNameId) {
  		for (CommerceDiscountRel commerceDiscountRel : findByCD_CN(
  				commerceDiscountId, classNameId, QueryUtil.ALL_POS,
  				QueryUtil.ALL_POS, null)) {
  			remove(commerceDiscountRel);
  		}
  	}
docs: Removes all the commerce discount rels where commerceDiscountId = &#63; and classNameId = &#63; from the database.
  
  @param commerceDiscountId the commerce discount ID
  @param classNameId the class name ID