Classe « Session »

Méthode sqlalchemy.orm.Session.expire_all

Signature de la méthode expire_all

def expire_all(self) 

Description

expire_all.__doc__

Expires all persistent instances within this Session.

        When any attributes on a persistent instance is next accessed,
        a query will be issued using the
        :class:`.Session` object's current transactional context in order to
        load all expired attributes for the given instance.   Note that
        a highly isolated transaction will return the same values as were
        previously read in that same transaction, regardless of changes
        in database state outside of that transaction.

        To expire individual objects and individual attributes
        on those objects, use :meth:`Session.expire`.

        The :class:`.Session` object's default behavior is to
        expire all state whenever the :meth:`Session.rollback`
        or :meth:`Session.commit` methods are called, so that new
        state can be loaded for the new transaction.   For this reason,
        calling :meth:`Session.expire_all` should not be needed when
        autocommit is ``False``, assuming the transaction is isolated.

        .. seealso::

            :ref:`session_expire` - introductory material

            :meth:`.Session.expire`

            :meth:`.Session.refresh`

            :meth:`_orm.Query.populate_existing`