__init__.py 文件源码

def get_session(dbpath, scoped=False):  # , enable_fk_if_sqlite=True):
    """
    Create an sql alchemy session for IO db operations
    :param dbpath: the path to the database, e.g. sqlite:///path_to_my_dbase.sqlite
    :param scoped: boolean (False by default) if the session must be scoped session
    """
    # init the session:
    engine = create_engine(dbpath)
    Base.metadata.create_all(engine)  # @UndefinedVariable

    # enable fkeys if sqlite. This can be added also as event listener as outlined here:
    # http://stackoverflow.com/questions/13712381/how-to-turn-on-pragma-foreign-keys-on-in-sqlalchemy-migration-script-or-conf
    # NOT implemented YET. See models.py

    if not scoped:
        # create a configured "Session" class
        session = sessionmaker(bind=engine)
        # create a Session
        return session()
    # return session
    else:
        session_factory = sessionmaker(bind=engine)
        return scoped_session(session_factory)