@Entity(tableName = "user")
public class User {
@PrimaryKey
public int id;
public String name;
public int age;
}
@Dao
public interface UserDao {
@Insert
void insert(User user);
@Query("SELECT * FROM user")
List<User> getAllUsers();
@Update
void update(User user);
@Delete
void delete(User user);
}
@Database(entities = {User.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
public abstract UserDao userDao();
private static volatile AppDatabase INSTANCE;
public static AppDatabase getInstance(Context context) {
if (INSTANCE == null) {
synchronized (AppDatabase.class) {
if (INSTANCE == null) {
INSTANCE = Room.databaseBuilder(context.getApplicationContext(),
AppDatabase.class, "my-database")
.build();
}
}
}
return INSTANCE;
}
}
