GreenDao一對多外鍵返回不起作用

Question

我用下面的代碼來定義兩個通過一對多關係相關的實體。

private static void addLuckyDrawClick(Schema schema) { 
    Entity luckyDrawClick = schema.addEntity("LuckyDrawClick"); 
    luckyDrawClick.addIdProperty(); 
    luckyDrawClick.addDateProperty("clickDate").notNull(); 
    luckyDrawClick.addStringProperty("user").notNull(); 
    Property userId = luckyDrawClick.addLongProperty("userId").getProperty(); 
    user.addToMany(luckyDrawClick, userId); 
    Main.luckyDrawClick = luckyDrawClick; 
} 

private static void addWeeklyClickList(Schema schema) { 
    Entity weeklyClickList = schema.addEntity("WeeklyClickList"); 
    weeklyClickList.addIdProperty(); 
    Property clickOne = weeklyClickList.addLongProperty("clickOneId").getProperty(); 
    weeklyClickList.addToOne(luckyDrawClick, clickOne, "clickOne"); 
    Property clickTwo = weeklyClickList.addLongProperty("clickTwoId").getProperty(); 
    weeklyClickList.addToOne(luckyDrawClick, clickTwo, "clickTwo"); 
    Property clickThree = weeklyClickList.addLongProperty("clickThreeId").getProperty(); 
    weeklyClickList.addToOne(luckyDrawClick, clickThree, "clickThree"); 
    Property clickFour = weeklyClickList.addLongProperty("clickFourId").getProperty(); 
    weeklyClickList.addToOne(luckyDrawClick, clickFour, "clickFour"); 
    Property clickFive = weeklyClickList.addLongProperty("clickFiveId").getProperty(); 
    weeklyClickList.addToOne(luckyDrawClick, clickFive, "clickFive"); 
    weeklyClickList.addBooleanProperty("latest"); 
    Main.weeklyClickList = weeklyClickList; 
} 

我用下面的代碼來堅持實體。

weeklyClickListDao = daoSession.getWeeklyClickListDao(); 
    User user = new User(); 
    user.setUsername("usr"); 
    user.setGender(false); 
    user.setName("Usr"); 
    user.setLocation("loc"); 
    user.setPassword("p"); 
    user.setDateOfBirth(new Date()); 
    user.setDeviceId("id"); 
    user.setContactNumber("contact"); 
    userDao.insert(user); 
    Log.d("size", "" + userDao.loadAll().size()); 

    currentUser = userDao.loadAll().get(0); 

    WeeklyClickList wcl = new WeeklyClickList(); 
    wcl.setLatest(true); 

    LuckyDrawClick ldc1 = new LuckyDrawClick(); 
    GregorianCalendar date1 = new GregorianCalendar(); 
    date1.set(Calendar.DAY_OF_MONTH, date1.get(Calendar.DAY_OF_MONTH) - 4); 
    date1.set(Calendar.HOUR_OF_DAY, 0); 
    date1.set(Calendar.MINUTE, 0); 
    date1.set(Calendar.SECOND, 0); 
    date1.set(Calendar.MILLISECOND, 0); 
    ldc1.setClickDate(date1.getTime()); 
    ldc1.setUser(currentUser.getUsername()); 
    wcl.setClickOne(ldc1); 
    wcl.setClickOneId(ldc1.getId());   
    luckyDrawClickDao.insert(ldc1); 

    LuckyDrawClick ldc2 = new LuckyDrawClick(); 
    GregorianCalendar date2 = new GregorianCalendar(); 
    date2.set(Calendar.DAY_OF_MONTH, date1.get(Calendar.DAY_OF_MONTH) - 3); 
    date2.set(Calendar.HOUR_OF_DAY, 0); 
    date2.set(Calendar.MINUTE, 0); 
    date2.set(Calendar.SECOND, 0); 
    date2.set(Calendar.MILLISECOND, 0); 
    ldc2.setClickDate(date2.getTime()); 
    ldc2.setUser(currentUser.getUsername());   
    wcl.setClickTwo(ldc2); 
    wcl.setClickTwoId(ldc2.getId()); 
    luckyDrawClickDao.insert(ldc2); 

    LuckyDrawClick ldc3 = new LuckyDrawClick(); 
    GregorianCalendar date3 = new GregorianCalendar(); 
    date3.set(Calendar.DAY_OF_MONTH, date1.get(Calendar.DAY_OF_MONTH) - 2); 
    date3.set(Calendar.HOUR_OF_DAY, 0); 
    date3.set(Calendar.MINUTE, 0); 
    date3.set(Calendar.SECOND, 0); 
    date3.set(Calendar.MILLISECOND, 0); 
    ldc3.setClickDate(date3.getTime()); 
    ldc3.setUser(currentUser.getUsername()); 
    wcl.setClickThree(ldc3); 
    wcl.setClickThreeId(ldc3.getId()); 
    luckyDrawClickDao.insert(ldc3); 

    LuckyDrawClick ldc4 = new LuckyDrawClick(); 
    GregorianCalendar date4 = new GregorianCalendar(); 
    date4.set(Calendar.DAY_OF_MONTH, date1.get(Calendar.DAY_OF_MONTH) - 1); 
    date4.set(Calendar.HOUR_OF_DAY, 0); 
    date4.set(Calendar.MINUTE, 0); 
    date4.set(Calendar.SECOND, 0); 
    date4.set(Calendar.MILLISECOND, 0); 
    ldc4.setClickDate(date4.getTime()); 
    ldc4.setUser(currentUser.getUsername()); 
    wcl.setClickFour(ldc4); 
    wcl.setClickFourId(ldc4.getId()); 
    luckyDrawClickDao.insert(ldc4); 

    weeklyClickListDao.insert(wcl); 

但是外鍵引用不包含在記錄中。

我做錯了什麼？

Answer 1

您設置在WCL的ClickFourId（爲例）在數據庫中插入最不發達國家之前，當你這樣做：

wcl.setClickFourId(ldc4.getId()); 

的ldc4.getId（）將返回null，當你插入WCL它沒有外鍵給ldc4。

試試這個方法：

luckyDrawClickDao.insert(ldc4); 
wcl.setClickFourId(ldc4.getId());