Calendar Htime= Calendar.getInstance();

        double nowtime = Htime.getTime().getTime();

        

        //ResultSet resultSet = ps.executeQuery();

        

        Calendar Ltime= Calendar.getInstance();

        double endtime = Ltime.getTime().getTime();

        BigDecimal longtime = new BigDecimal((endtime-nowtime)/1000);

        double second =longtime.setScale(3,BigDecimal.ROUND_HALF_UP).doubleValue();