public String tryJoinClub(int cid, int uid) {
		// if that guy already existed in the club's member list
		for (int existedMember : this.userDao.clubMembersUid(cid)) {
			if (uid == existedMember)
				return "member";
		}
		// if that guy already sent out an join_club_apply
		for (Object obj : this.userDao.clubJoinApplyList(cid)) {
			Map<?, ?> map = (Map<?, ?>) obj;
			if (uid == Integer.parseInt(map.get("applicant_uid").toString()))
				return "applying";
		}
		
		return "Ñ…Ð°Ñ€Ð°ÑˆÐ¾";	// good to go
	}