Android会议室数据库，用ID替换元素

Question

How to replace existed object by id in the room? For example, I have User with id 7 and name John . Then I change name to Bob . How to update or replace it by id in the room?

Answer 1

Use the update annotation in your Dao, it would update based on the primary key (id in your case)

@Update()
void updateUser(User user);

Answer 2

You can use REPLACE strategy on conflict and declare insert method this way:

@Dao
interface UserDao {

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    fun insertUser(user: User)
}