[chaley]

@jackie_w: if you normally use the new DB interface then you can get a new db handle with something like the following function

def init_cache(library_path):
	from calibre.db.backend import DB
	from calibre.db.cache import Cache
	backend = DB(library_path)
	cache = Cache(backend)
	cache.init()
	return cache

You would use it in some way like the following, of course depending on what you are doing

cache = init_cache(sys.argv[1])

# Loop through all the books in the library
for id_ in cache.all_book_ids():
    .....