实体关系未正确填充

Question

在使用 Hibernate 的 Spring MVC 应用程序中，无法正确填充以多对多关系连接两个实体的列表。实体是Encounter 和Provider。 Encounter 实体有一个属性providers，它是Property 实体的列表，并且没有正确填充。有人可以帮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的控制器方法代码如下：

@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() 命令输出如下：

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  

从上面的输出可以看出，只有一个Encounter 对象的numProviders 大于0。尽管Encounters 中的每一个都在基础数据表中指定了Provider，但这是正确的。

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

您可以阅读在基础数据库at this link 中为encounters 和providers 创建和填充数据表的代码。

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

每次插入providerEncounterJunction 表都使用相同的主键。我猜他们只是在互相覆盖，而你在那个表中只有一行。