@Override
	public String getCurrentReservationIndex() {
		Statement stmt = null;
		int max = 0;

		try {
			stmt = con.createStatement();

			ResultSet results = stmt.executeQuery("Select * from Reservation");

			while (results.next()) {
				String strnum = results.getString("ID");
				int intnum = Integer.parseInt(strnum);
				if (intnum > max) {
					max = intnum;
				}
			}
			return Integer.toString(max + 1);

		} catch (SQLException e) {
			e.printStackTrace();
			return null;
		} finally {
			if (stmt != null) {
				try {
					stmt.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}
	}