Not sure if this will help, but you should probably be using the new db api. For that one add_books is:
Code:
def add_books(self, books, add_duplicates=True, apply_import_tags=True, preserve_uuid=False, run_hooks=True, dbapi=None):
duplicates, ids = [], []
for mi, format_map in books:
book_id = self.create_book_entry(mi, add_duplicates=add_duplicates, apply_import_tags=apply_import_tags, preserve_uuid=preserve_uuid)
if book_id is None:
duplicates.append((mi, format_map))
else:
ids.append(book_id)
for fmt, stream_or_path in format_map.iteritems():
self.add_format(book_id, fmt, stream_or_path, dbapi=dbapi, run_hooks=run_hooks)
return ids, duplicates
The books parameter is a dictionary of mi records and a formats dict telling calibre where to get the format.
You get a reference to "cache" via db.new_api.
EDIT: walked away from my screen and Kovid answered.
