我有使用sqlite作為數據庫的Django應用。我不會制作能夠下載該sqlite文件的視圖。到目前為止，這是我得到的：def backup(request):    """Return Sqlite3 db file, if Sqlite3 db is used."""    import settings    db_engine = settings.DATABASES['default']['ENGINE']    #db_engine = 'JUST_FOR_TESTING'    if db_engine == 'django.db.backends.sqlite3':        db_path = settings.DATABASES['default']['NAME']        response = HttpResponse(mimetype='application/x-sqlite3')        response['Content-Disposition'] = 'attachment; filename=%s' % db_path        response.write(db_path)        return HttpResponse(response)    else:        return HttpResponse("settings.DATABASES['default']['ENGINE'] is %s,<br />\                             only for 'django.db.backends.sqlite3' online backup is posible." % (db_engine))我所缺少的是如何將文件添加為附件。還可以通過某種方式僅下載特定表嗎？