code: private void closeResultSet(ResultSet rs) {
      if (rs != null) {
        try {
          rs.close();
        } catch (SQLException e) {
          logger.error("Could not close JDBC ResultSet", e);
        } catch (Throwable e) {
          logger.error("Unexpected exception on closing JDBC ResultSet", e);
        }
      }
    }
docs: 关闭结果集
  
  @param rs