Returns the canonical (database_name, library) for the passed in
        string 'library'.

def _parse_db_lib(cls, library):
        """
        Returns the canonical (database_name, library) for the passed in
        string 'library'.
        """
        database_name = library.split('.', 2)
        if len(database_name) == 2:
            library = database_name[1]
            if database_name[0].startswith(cls.DB_PREFIX):
                database_name = database_name[0]
            else:
                database_name = cls.DB_PREFIX + '_' + database_name[0]
        else:
            database_name = cls.DB_PREFIX
        return database_name, library