docs: public <OD> Where<T, ID> idEq(Dao<OD, ?> dataDao, OD data) throws SQLException {
  		if (idColumnName == null) {
  			throw new SQLException("Object has no id column specified");
  		}
  		addClause(new SimpleComparison(idColumnName, idFieldType, dataDao.extractId(data),
  				SimpleComparison.EQUAL_TO_OPERATION));
  		return this;
  	}