client.py 文件源码

def create_session(self,
                       bind,
                       options=None,
                       session_class=Session,
                       query_class=SQLQuery):
        """Factory function to create a scoped session using `bind`.

        Args:
            bind (Engine|Connection): Database engine or connection instance.
            options (dict, optional): Session configuration options.
            session_class (obj, optional): Session class to use when creating
                new session instances. Defaults to :class:`.Session`.
            query_class (obj, optional): Query class used for ``session.query``
                instances. Defaults to :class:`.SQLQuery`.

        Returns:
            Session: SQLAlchemy session instance bound to `bind`.
        """
        if options is None:  # pragma: no cover
            options = {}

        if query_class:
            options['query_cls'] = query_class

        scopefunc = options.pop('scopefunc', None)
        session_factory = orm.sessionmaker(bind=bind,
                                           class_=session_class,
                                           **options)

        return orm.scoped_session(session_factory, scopefunc=scopefunc)