public static String GetJsonToString(Statement statement,String UID)
	{
		List<ParkRelation> parkList = new ArrayList();
		String resultString = null;
		String sql;
		String result = null;
		sql = "select * from parkrelation where UID = '" + UID +"'";
		try 
		{
			ResultSet rs = statement.executeQuery(sql);
			while (rs.next()) {
				ParkRelation parkRelation = new ParkRelation();
				parkRelation.setOrderNumber(rs.getInt("ordernumber"));
				parkRelation.setPhoneNumber(rs.getString("phonenumber"));
				parkRelation.setCarNumber(rs.getString("carnumber"));
				parkRelation.setBookTime(rs.getString("booktime"));
				parkRelation.setOrderTime(rs.getString("ordertime"));
				parkRelation.setIsin(rs.getInt("isin"));
				parkRelation.setIsout(rs.getInt("isout"));
				parkRelation.setPid(rs.getString("PID"));
				parkRelation.setUid(rs.getString("UID"));
				parkRelation.setParkname(rs.getString("parkname"));
				parkList.add(parkRelation);
			}
			
			JSONArray jsonArray = JSONArray.fromObject(parkList);
			resultString = jsonArray.toString();
		} 
		catch (SQLException e) 
		{
			System.out.println("Error! (from src/Operation/ParkRelationList");
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return resultString;
	}