implementation "androidx.room:room-runtime:2.3.0"
annotationProcessor "androidx.room:room-compiler:2.3.0"
@Entity(tableName = "users")
public class User {
@PrimaryKey(autoGenerate = true)
public int id;
@ColumnInfo(name = "name")
public String name;
@ColumnInfo(name = "age")
public int age;
}
@Dao
public interface UserDao {
@Insert
void insert(User user);
@Delete
void delete(User user);
@Update
void update(User user);
@Query("SELECT * FROM users")
List<User> getAllUsers();
}
@Database(entities = {User.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
private static AppDatabase instance;
public static synchronized AppDatabase getInstance(Context context) {
if (instance == null) {
instance = Room.databaseBuilder(context.getApplicationContext(),
AppDatabase.class, "app_database")
.fallbackToDestructiveMigration()
.build();
}
return instance;
}
public abstract UserDao userDao();
}
User user = new User();
user.age = 25;
AppDatabase.getInstance(this).userDao().insert(user);
List<User> userList = AppDatabase.getInstance(getContext()).userDao().getAllUsers();
for (User user : userList) {
Log.d("User", "Name: " + user.name + ", Age: " + user.age);
}
