public LogForm queryCarLogForm(Integer car_id) {
   String sql = "select * from tb_carlog where car_id=" + car_id + "";
   ResultSet rs = connection.executeQuery(sql);
   logForm = null;
   try {
     while (rs.next()) {
       logForm = new LogForm();
       logForm.setId(rs.getInt(1));
       logForm.setGoods_id(rs.getString(2));
       logForm.setCar_id(rs.getString(3));
       logForm.setStartTime(rs.getString(4));
       logForm.setEndTime(rs.getString(5));
       logForm.setDescribe(rs.getString(6));
     }
   } catch (SQLException e) {
     e.printStackTrace();
   }
   return logForm;
 }
 public static void main(String[] args) {
   GoodsAndLogDao dao = new GoodsAndLogDao();
   LogForm form = dao.queryCarLogForm(4);
   System.out.println(form.getId());
 }