public KhachHangDao() { db = new DbSach(); }
public ChuDeDao() { db = new DbSach(); }
public SachDao() { db = new DbSach(); }
public NhaXuatBanDao() { db = new DbSach(); }
public KHDaoLogin() { db = new DbSach(); }
public KhachHangDao() { db = new DbSach(); }
public ChuDeDao() { db = new DbSach(); }
public SachDao() { db = new DbSach(); }
public NhaXuatBanDao() { db = new DbSach(); }
public KHDaoLogin() { db = new DbSach(); }