@Entity
public class Person {
    // 主鍵，自增長(zhǎng)
    @PrimaryKey(autoGenerate = true)
    private int id;
    private String name;
    private String sex;
    private int age;
}

@Dao
public interface PersonDao {
    // 插入
    @Insert
    void insertPersons(Person... persons);
    // 修改
    @Update
    void updatePersons(Person... persons);
    // 刪除所有
    @Query("delete from Person")
    void deleteAllPersons();
    // 刪除指定實(shí)體
    @Delete
    void deletePersons(Person... persons);
    // 根據(jù)id刪除
    @Query("delete from Person where id in (:ids)")
    void deleteByIds(int ...ids);
    // 根據(jù)id查詢
    @Query("select * from Person where id in (:ids)")
    List<Person> selectByIds(int ...ids);
    // 查詢所有
    @Query("select * from Person order by id desc")
    List<Person> selectAllPersons();
}

@Database(entities = {Person.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
    public abstract PersonDao personDao();
    private volatile static AppDatabase instance;
    public static AppDatabase getInstance(Context context){
        if (instance == null) {
            synchronized (DBHelper.class) {
                if (instance == null) {
                    instance = Room.databaseBuilder(context, AppDatabase.class, "person.db").build();
                }
            }
        }
        return instance;
    }
}

ExecutorService pool = Executors.newCachedThreadPool();
// 插入數(shù)據(jù)
public void insertRoom(View view) {
    AppDatabase db = AppDatabase.getInstance(getApplicationContext());
    pool.execute(() -> {
        PersonDao dao = db.personDao();
        Person p1 = new Person("用戶1", "男", 18);
        Person p2 = new Person("用戶2", "男", 28);
        Person p3 = new Person("用戶3", "男", 38);
        dao.insertPersons(p1, p2, p3);
    });
}
// 查詢數(shù)據(jù)
public void queryRoom(View view) {
    AppDatabase db = AppDatabase.getInstance(getApplicationContext());
    pool.execute(() -> {
        PersonDao dao = db.personDao();
        List<Person> list = dao.selectAllPersons();
        list.forEach(p-> Log.d("test", p.toString()));
    });
}
// 根據(jù)id查詢
public void queryRoomById(View view) {
    AppDatabase db = AppDatabase.getInstance(getApplicationContext());
    pool.execute(() -> {
        PersonDao dao = db.personDao();
        List<Person> list = dao.selectByIds(3,4);
        list.forEach(p-> Log.d("test", p.toString()));

    });
}
// 刪除
public void deleteRoom(View view) {
    AppDatabase db = AppDatabase.getInstance(getApplicationContext());
    pool.execute(() -> {
        PersonDao dao = db.personDao();
        dao.deleteByIds(1,2);
    });
}

public class DateConverter {
    @TypeConverter
    public static Date toDate(Long dateLong) {
        return dateLong == null ? null : new Date(dateLong);
    }
    @TypeConverter
    public static Long fromDate(Date date) {
        return date == null ? null : date.getTime();
    }
}

@Entity
@TypeConverters({DateConverter.class})
public class BsGoods {
    private static final long serialVersionUID = 1122172437556010779L;
    // 主鍵
    @PrimaryKey
    private Long id;
    private Date createdDate;
    private Date updatedDate;
    ...
}

public class BigDecimalConverter {
    @TypeConverter
    public static String toStr(BigDecimal decimal) {
        return decimal == null ? null : decimal.toString();
    }
    @TypeConverter
    public static BigDecimal toDecimal(String str) {
        return str == null ? null : new BigDecimal(str);
    }
}

public void selectAll(Consumer<List<BsGoods>> fun) {
    BsGoodsDao dao = bsGoodsDao();
    Observable.just("select")
            .map(s -> dao.selectAll())
            .subscribeOn(Schedulers.io())// 給上面的操作分配異步線程
            .observeOn(AndroidSchedulers.mainThread())// 給終點(diǎn)分配安卓主線程
            .subscribe(new Observer<List<BsGoods>>() {
                @Override
                public void onSubscribe(@NonNull Disposable d) {
                }
                @Override
                public void onNext(@NonNull List<BsGoods> bsGoods) {
                    fun.accept(bsGoods);
                }
                @Override
                public void onError(@NonNull Throwable e) {
                }
                @Override
                public void onComplete() {
                }
            });
}

private void initializeTableViewLocal() {
    BsGoodsDatabase db = BsGoodsDatabase.getInstance(getContext());
    db.selectAll(list -> {
        GoodsTableViewModel tableViewModel = new GoodsTableViewModel(list);
        TableViewAdapter tableViewAdapter = new TableViewAdapter(tableViewModel);
        mTableView.setAdapter(tableViewAdapter);
        mTableView.setTableViewListener(new TableViewListener(mTableView));
        tableViewAdapter.setAllItems(tableViewModel.getColumnHeaderList(), tableViewModel
                .getRowHeaderList(), tableViewModel.getCellList());
    });
}