code: public void execute(boolean update) {
  		if (update) {
  			final String sql = getSql().replace("DELETE", "SELECT " + Model._ID);
  			final List<T> results = QueryUtils.rawQuery(mTable, sql, getArgs());
  			for (T result : results) {
  				result.id = null;
  			}
  		}
  		super.execute();
  	}
docs: Execute the delete statement and optionally update the entity id to null. Updating the id requires a select
  query of the rows to delete so if speed is a concern use execute(false) instead of execute().
  @param update Whether to update the entity id.