Android 学习手册

@Entity(tableName = "users")
public class User {
    @PrimaryKey(autoGenerate = true)
    public int id;
    public String name;
}

@Dao
public interface UserDao {
    @Insert void insert(User user);
    @Query("SELECT * FROM users") LiveData getAll();
}

@Database(entities = {User.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
    public abstract UserDao userDao();
}

AppDatabase db = Room.databaseBuilder(context, AppDatabase.class, "mydb").build();