@Entity
public class Province {
    @Id
    private Long id;
    private String provinceName;
    private String provinceCode;
    }

public class App extends Application {
    //這里我們定義一個(gè)標(biāo)志，從而去切換數(shù)據(jù)庫的標(biāo)準(zhǔn)模式和加密模式
    public static final boolean ENCRYPTED = true;
    private DaoSession daoSession;
    @Override
    public void onCreate() {
        super.onCreate();
        DevOpenHelper helper = new DevOpenHelper(this, ENCRYPTED ? "province-db-encrypted" : "province-db");
        Database db = ENCRYPTED ? helper.getEncryptedWritableDb("super-secret") : helper.getWritableDb();
        daoSession = new DaoMaster(db).newSession();
    }
    public DaoSession getDaoSession() {
        return daoSession;
    }
}

private ProvinceDao provinceDao;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mine_fix_school);
        DaoSession daoSession = ((App) getApplication()).getDaoSession();
        provinceDao = daoSession.getProvinceDao();
    }

    List<Province> provinceList = provinceDao.queryBuilder().build().list();
        if (provinceList.size() > 0) {
            //數(shù)據(jù)庫有數(shù)據(jù)時(shí)進(jìn)行處理
        }else {
            //數(shù)據(jù)庫無數(shù)據(jù)時(shí)，獲取網(wǎng)絡(luò)數(shù)據(jù)進(jìn)行數(shù)據(jù)存儲(chǔ)
            api.areas(areaCode)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new MySubscriber<List<Province>>() {
                    @Override
                    public void onNext(List<Province> provinceList) {
                      for (Province province : provinceList) {
                           //插入數(shù)據(jù)
                           provinceDao.insert(province);
                      }
                });
        }

    for (Province province : provinceList) {
            //刪除數(shù)據(jù)
            provinceDao.delete(province);
        }

Province province = provinceDao.queryBuilder().where(ProvinceDao.Properties.ProvinceCode.eq(10)).build().unique();
        if (province == null) {
            //用戶不存在
        }else {
            province.setProvinceName("修改浙江省");
            //修改數(shù)據(jù)
            provinceDao.update(province);
        }

List<Province> provinces = provinceDao.queryBuilder().where(ProvinceDao.Properties.ProvinceCode.between(10, 20)).build().list();
        for (Province province : provinces) {
            //輸出查詢內(nèi)容
            Log.d("TAG","search:" + province.getProvinceName());
        }