code: private void closeQuietly() {
          log.debug("closing rs");
          Util.closeQuietly(rs);
          log.debug("closing ps");
          Util.closeQuietly(ps);
          log.debug("closing con");
          Util.closeQuietlyIfAutoCommit(con);
          log.debug("closed");
      }
docs: Closes connection resources (connection, prepared statement and result
  set).