Xây dựng lớp DAO cho item - Tài liệu lập trình android

package com.vantinviet.adayroionline.db;

import com.vantinviet.adayroionline.viewobject.Item;

import java.util.List;

import androidx.lifecycle.LiveData;
import androidx.room.Dao;
import androidx.room.Insert;
import androidx.room.OnConflictStrategy;
import androidx.room.Query;

@Dao
public interface ItemDao {

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insertAll(List<Item> items);

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insert(Item item);

    @Query("SELECT * FROM Item WHERE id = :id")
    LiveData<Item> getItemById(String id);

    @Query("SELECT * FROM Item ORDER BY addedDate desc")
    LiveData<List<Item>> getAllItems();

    @Query("DELETE FROM Item")
    void deleteAll();

}