android连接数据库代码

dependencies {
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    implementation 'androidx.room:room-runtime:2.3.0'
    kapt 'androidx.room:room-compiler:2.3.0'
}

public interface ApiService {
    @GET("users")
    Call<List<User>> getUsers();
}

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl("https://your-api-url.com/")
    .addConverterFactory(GsonConverterFactory.create())
    .build();

ApiService apiService = retrofit.create(ApiService.class);

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

@Dao
public interface UserDao {
    @Query("SELECT * FROM user")
    List<User> getAll();

    @Insert
    void insertAll(User... users);
}

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

AppDatabase db = Room.databaseBuilder(getApplicationContext(),
        AppDatabase.class, "database-name").build();
UserDao userDao = db.userDao();