Optional query parameters for Android Room

问题

I have the following DAO with a query:

@Dao
public interface BaseballCardDao {
    @Query(
        "SELECT * FROM baseball_cards " +
        "WHERE brand LIKE :brand " +
        "  AND year = :year " +
        "  AND number LIKE :number " +
        "  AND player_name LIKE :playerName " +
        "  AND team LIKE :team"
    )
    LiveData<List<BaseballCard>> getBaseballCards(
        String brand, int year, String number, String playerName, String team
    );
}

The String parameters are "optional" in the sense that I can pass "%%" to match all rows due to the LIKE operator. But I cannot do this with year since it is an int. One solution is to add two different @Query methods, one with the int year parameter and the other without. Is there a more elegant way to create an optional parameter with Room's @Query?

来源：https://stackoverflow.com/questions/52029435/optional-query-parameters-for-android-room