java - 实体关系未正确填充

Question

在使用 Hibernate 的 Spring MVC 应用程序中，以多对多关系连接两个实体的列表未正确填充。这些实体是 Encounter 和 Provider。 Encounter 实体有一个属性 providers，它是 Property 实体的列表，并且未正确填充。有人可以帮助我弄清楚如何修复我的代码以便实体开始正确填充吗？

无法正确填充ArrayList的 Controller 方法代码如下:

@RequestMapping("/calendar")
public String showCalendar(@RequestParam("day") String day, org.springframework.web.context.request.WebRequest webRequest, Model model) {
    String pid = webRequest.getParameter("pid");
    System.out.println("............ pid is:  " + pid);

    model.addAttribute("pid", pid);
    LocalDate mydate;

    if(day.equals("")) {
      mydate = new LocalDate();
    } else {
      mydate = new LocalDate(day);
    }

    System.out.println("------------------------ in controller, day of month is:  " + mydate.getDayOfMonth());
    AppointmentCalendar calendar = new AppointmentCalendar(mydate); // Or whatever you do to create it
    List<Encounter> encountersforday = (List<Encounter>) clinicService.getEncountersForDay(mydate);

    model.addAttribute("calendar", calendar);
    model.addAttribute("encountersforday", encountersforday);

    System.out.println("number of encountersforday is: " + encountersforday.size());

    List<LocalTime> myblocks = calendar.getBlocks();
    int[][] filledblocks = new int[myblocks.size()][3];
    for (Integer i=0; i < encountersforday.size(); i++) {
        System.out.println("i, encounterid, patientid, first, last, " +
                           "numProviders, dateTime are: " + i + ", " +
                           encountersforday.get(i).getId() + ", " +
                           encountersforday.get(i).getPatient().getId() + ", " +
                           encountersforday.get(i).getPatient().getFirstName() + ", " +
                           encountersforday.get(i).getPatient().getLastName() + ", " +
                           encountersforday.get(i).getProviders().size() + ", " +
                           encountersforday.get(i).getDateTime());
        for (Integer g=0; g < myblocks.size(); g++) {
            filledblocks[g][0] = g;//blockid
            if (myblocks.get(g).getHourOfDay() == encountersforday.get(i).getDateTime().getHourOfDay()) {
                if (myblocks.get(g).getMinuteOfHour() == encountersforday.get(i).getDateTime().getMinuteOfHour()) {
                    int hours = myblocks.get(g).getHourOfDay();
                    int mins = myblocks.get(g).getMinuteOfHour();
                    System.out.println("found match at: "+hours+":"+mins);
                    filledblocks[g][1] = i+1;//encounterid
                    filledblocks[g][2] = 1;//segmentindex
                }
            }
        }
    }

    return "appointments/calendar";
}

上述代码中的System.out.println()命令输出以下内容:

number of encountersforday is: 5
i, encounterid, patientid, first, last, numProviders, dateTime are: 0, 1, 5, Peter, McTavish, 0, 2014-01-10T12:00:00.000-08:00
found match at: 12:0
i, encounterid, patientid, first, last, numProviders, dateTime are: 1, 2, 4, Harold, Davis, 0, 2014-01-10T11:30:00.000-08:00
found match at: 11:30
i, encounterid, patientid, first, last, numProviders, dateTime are: 2, 3, 3, Eduardo, Rodriquez, 0, 2014-01-10T10:00:00.000-08:00
found match at: 10:0
i, encounterid, patientid, first, last, numProviders, dateTime are: 3, 4, 2, Morticia, Adams, 0, 2014-01-10T09:30:00.000-08:00
found match at: 9:30
i, encounterid, patientid, first, last, numProviders, dateTime are: 4, 5, 1, Speed, Racer, 1, 2014-01-10T13:30:00.000-08:00
found match at: 13:30  

从上面的输出中可以看出，只有一个 Encounter 对象的 numProviders 大于 0。尽管事实上每个 Encounters 都有一个在基础数据表中指定的 Provider，但事实确实如此。

注意:为了简化此发布，我已将相关代码上传到文件共享网站。您可以通过点击下面的链接在文件共享站点查看代码。

您可以阅读用于在底层数据库中创建和填充遭遇和提供者数据表的代码 at this link 。

Encounter 实体的代码是 at this link .

Provider 实体的代码是 at this link 。

BaseEntity 的代码是 at this link 。

Person 实体的代码是 at this link 。

Answer 1

对 providerEncounterJunction 表的每次插入都使用相同的主键。我猜它们只是互相覆盖，而该表中实际上只有一行。