private static Record findCache(PreparedStatement pstmt, Cache cache, int id) throws SQLException {
		Record record = cache.lookUp(id);

		// 캐시에 없으면 새로 추가
		if(record == null) {
			record = selectById(pstmt, id);
			cache.store(record);
		} else {
			countHit++;
		}

		return record;
	}