final String umChart = ChartEnumHelper.getByName(field).getUm();
final Query q = ds.createQuery(Meteolog.class);
final Date dFrom = DateTimeUtil.getDate("yyyy-MM-dd hh:mm:ss", from);
final Date dTo = DateTimeUtil.getDate("yyyy-MM-dd hh:mm:ss", to);
q.disableValidation().filter("time >=", dFrom).filter("time <=", dTo);
final List<Meteolog> meteoLogList = q.asList();
final TimeSeries series = new TimeSeries(umChart);
for (Meteolog m : meteoLogList) {