SQLite：如何選擇全部，並為某些列另外設置一個值

Question

我有以下查詢。

@Query("SELECT * FROM sounds GROUP BY artistId ORDER BY artist")
        List<Sound> getArtists();

我想選擇全部，然后將isDirectory設置為對於此查詢中返回的所有行都返回true。

我嘗試了這個：

@Query("SELECT *, " +
                "artist AS title," +
                "isDirectory AS 'true' " +
                "FROM sounds GROUP BY artistId ORDER BY artist").

我意識到這是針對列別名的，有沒有辦法使用類似於AS的名稱，而不是名稱，而是值。

Answer 1

嘗試使用'true' AS isDirectory而不要'true' AS isDirectory