Method after_begin

lib/sqlalchemy/orm/events.py:2012–2042

Execute after a transaction is begun on a connection. .. note:: This event is called within the process of the :class:`_orm.Session` modifying its own internal state. To invoke SQL operations within this hook, use the :class:`_engine.Connection` provided to the

(
        self,
        session: Session,
        transaction: SessionTransaction,
        connection: Connection,
    )

        """

    def after_begin(
        self,
        session: Session,
        transaction: SessionTransaction,
        connection: Connection,
    ) -> None:
        """Execute after a transaction is begun on a connection.

        .. note:: This event is called within the process of the
          :class:`_orm.Session` modifying its own internal state.
          To invoke SQL operations within this hook, use the
          :class:`_engine.Connection` provided to the event;
          do not run SQL operations using the :class:`_orm.Session`
          directly.

        :param session: The target :class:`.Session`.
        :param transaction: The :class:`.SessionTransaction`.
        :param connection: The :class:`_engine.Connection` object
         which will be used for SQL statements.

        .. seealso::

            :meth:`~.SessionEvents.before_commit`

            :meth:`~.SessionEvents.after_commit`

            :meth:`~.SessionEvents.after_transaction_create`

            :meth:`~.SessionEvents.after_transaction_end`

        """

    @_lifecycle_event
    def before_attach(self, session: Session, instance: _O) -> None: