插入子实体后,GreenDAO 不会更新实体的子树
GreenDAO does not update the entity's children tree after insert child entity
我有两个 GreenDAO 实体,"Card" 与 "Lesson" 有 n-1 关系。
public class Card {
private Long id;
private String SourceText;
private String TargetText;
private byte[] Image;
private Long Point;
private Long lessonID;
}
public class Lesson {
private Long id;
private String LessonName;
private String ShortDes;
private String LongDes;
private byte[] Picture;
private java.util.Date CreatedDate;
private String CreatedBy;
private Long sourceLangID;
private Long targetLangID;
/** Used to resolve relations */
private transient DaoSession daoSession;
/** Used for active entity operations. */
private transient LessonDao myDao;
private List<Card> cards;
}
在activity A1 - 观看L1课时,我使用了startActivityForResult(A2),转到A2,并将一些卡片插入到L1的卡片列表中。记录被插入到数据库中,但是当我在 A2 中完成()并返回到 A1 时,在 onResult 事件中:
void loadCards() {
daoSession = null;
daoSession = ((FlashcardApplication) getApplicationContext()).daoSession;
lessonDao = daoSession.getLessonDao();
currentLesson = null;
currentLesson = lessonDao.loadByRowId(id);
cards = currentLesson.getCards();
lblLessonName.setText("Cards of "+currentLesson.getLessonName());
daoSession = ((FlashcardApplication) getApplicationContext()).daoSession;
// cards = cardDao.queryDeep("lessonID = " + currentLesson.getId(), null);
CardListAdapter adapter = new CardListAdapter(getApplicationContext(), R.layout.lv_item_card_of_lesson, cards);
lvCards.setAdapter(adapter);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == 1){
if(resultCode == CardCreateActivity.SUCCESS){
loadCards();
Toast.makeText(getApplicationContext(), "This set have " + cards.size() +" cards",Toast.LENGTH_SHORT).show();
}
return;
}
Toast.makeText(getApplicationContext(),"Unknowed intent when back to LocalLessonCardManage",Toast.LENGTH_SHORT);
}
卡片列表未更新。还是和插入前一样。当我重新启动并访问 activity A1 时,显示了新记录。我认为 GreenDAO 正在保持课程对象的状态 L1
。我知道 lessonDao.refresh(l1)
仅更新 L1
而不是其子树。有没有办法刷新卡片列表?我想继续使用 startActivityForResult()
,从 A2
到 A1
的肮脏方式 startActivity()
可能会奏效,但我不喜欢它。
出于性能原因,关系被缓存并且必须在进行修改时手动更新。
试试这个
currentLesson.resetCards();
cards = currentLesson.getCards();
Here 你有更多关于这个的信息
我有两个 GreenDAO 实体,"Card" 与 "Lesson" 有 n-1 关系。
public class Card {
private Long id;
private String SourceText;
private String TargetText;
private byte[] Image;
private Long Point;
private Long lessonID;
}
public class Lesson {
private Long id;
private String LessonName;
private String ShortDes;
private String LongDes;
private byte[] Picture;
private java.util.Date CreatedDate;
private String CreatedBy;
private Long sourceLangID;
private Long targetLangID;
/** Used to resolve relations */
private transient DaoSession daoSession;
/** Used for active entity operations. */
private transient LessonDao myDao;
private List<Card> cards;
}
在activity A1 - 观看L1课时,我使用了startActivityForResult(A2),转到A2,并将一些卡片插入到L1的卡片列表中。记录被插入到数据库中,但是当我在 A2 中完成()并返回到 A1 时,在 onResult 事件中:
void loadCards() {
daoSession = null;
daoSession = ((FlashcardApplication) getApplicationContext()).daoSession;
lessonDao = daoSession.getLessonDao();
currentLesson = null;
currentLesson = lessonDao.loadByRowId(id);
cards = currentLesson.getCards();
lblLessonName.setText("Cards of "+currentLesson.getLessonName());
daoSession = ((FlashcardApplication) getApplicationContext()).daoSession;
// cards = cardDao.queryDeep("lessonID = " + currentLesson.getId(), null);
CardListAdapter adapter = new CardListAdapter(getApplicationContext(), R.layout.lv_item_card_of_lesson, cards);
lvCards.setAdapter(adapter);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == 1){
if(resultCode == CardCreateActivity.SUCCESS){
loadCards();
Toast.makeText(getApplicationContext(), "This set have " + cards.size() +" cards",Toast.LENGTH_SHORT).show();
}
return;
}
Toast.makeText(getApplicationContext(),"Unknowed intent when back to LocalLessonCardManage",Toast.LENGTH_SHORT);
}
卡片列表未更新。还是和插入前一样。当我重新启动并访问 activity A1 时,显示了新记录。我认为 GreenDAO 正在保持课程对象的状态 L1
。我知道 lessonDao.refresh(l1)
仅更新 L1
而不是其子树。有没有办法刷新卡片列表?我想继续使用 startActivityForResult()
,从 A2
到 A1
的肮脏方式 startActivity()
可能会奏效,但我不喜欢它。
出于性能原因,关系被缓存并且必须在进行修改时手动更新。
试试这个
currentLesson.resetCards();
cards = currentLesson.getCards();
Here 你有更多关于这个的信息