code: public Record findFirst(String sql, Object... paras) {
  		List<Record> result = find(sql, paras);
  		return result.size() > 0 ? result.get(0) : null;
  	}
docs: Find first record. I recommend add "limit 1" in your sql.
  @param sql an SQL statement that may contain one or more '?' IN parameter placeholders
  @param paras the parameters of sql
  @return the Record object