插入项目两次时的Android Room持久性SQLiteConstraintException

Question

我一直在使用 Room 持久性库，该库一直运行良好，直到我在两个不同的插入项中添加项目。

声音实体类

@Entity
public class Sound {
@PrimaryKey(autoGenerate = true)
private int sid;
@ColumnInfo(name = "sound_theme")
private int soundTheme;
@ColumnInfo(name = "sound_name")
private String soundName;
@ColumnInfo(name = "sound_resource")
private int soundResource;
@ColumnInfo(name = "sound_image_resource")
private int soundImageResource;
@ColumnInfo(name = "sound_favorite")
private boolean isFavorite;
@ColumnInfo
private int usedCount;
@ColumnInfo
private long lastUsed;


 public Sound(int soundTheme, String soundName, int soundResource, int soundImageResource, boolean isFavorite, int usedCount, long lastUsed) {
    this.soundTheme = soundTheme;
    this.soundName = soundName;
    this.soundResource = soundResource;
    this.soundImageResource = soundImageResource;
    this.isFavorite = isFavorite;
    this.usedCount = usedCount;
    this.lastUsed = lastUsed;
}

注意我有一个健全的 id 作为自动生成的主键。

声音 DAO

@Dao
public interface SoundDao {

@Query("SELECT * FROM sound")
List<Sound> getAll();

@Query("SELECT * FROM sound WHERE sid IN (:soundIds)")
List<Sound> loadAllByIds(int[] soundIds);

@Query("SELECT * FROM sound WHERE sound_name LIKE :name LIMIT 1")
Sound findByName(String name);

@Query("SELECT * FROM sound WHERE sid LIKE :id LIMIT 1")
Sound findById(int id);

@Insert
void insertAll(Sound... sounds);

@Insert
void insertAllArrList(ArrayList<Sound> sounds);

@Delete
void delete(Sound sound);

@Query("DELETE FROM sound")
public void deleteAllSounds();
}

错误与这一行有关：

      if (focusedSound.isFavorite()) 
      favorites.soundDao().insertAll(focusedSound); 
      else favorites.soundDao().delete(selectedSound);

第一次插入顺利（如果您在其中插入多个项目也可以），第二次插入它会崩溃。 我认为它与声音 id(sid) 的主键有关，但我不确定如何解决。

这里是一些错误日志：

06-03 20:03:36.454 8807-8807/com.zaid.green.soundpress E/InputEventReceiver: 
Exception dispatching input event.
06-03 20:03:36.454 8807-8807/com.zaid.green.soundpress E/MessageQueue-JNI: 
Exception in MessageQueue callback: handleReceiveCallback
06-03 20:03:36.460 8807-8807/com.zaid.green.soundpress E/MessageQueue-JNI: 
android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: 
Sound.sid (code 1555)
SQLiteConnection at nativeExecuteForLastInsertedRowId(Native Method)  
SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:782)
    at 

Answer 1

是的，你是对的，问题在于主要约束和插入的重复项。

解决方案：在您的 @intert 方法上将 OnConflictStratergy 定义为

@Insert(onConflict = OnConflictStrategy.REPLACE)
void insertAll(Sound... sounds);

@Insert(onConflict = OnConflictStrategy.REPLACE)
void insertAllArrList(ArrayList<Sound> sounds);

如您所见，这会将新对象替换为旧对象