Method get

lib/sqlalchemy/orm/session.py:3591–3712

Return an instance based on the given primary key identifier, or ``None`` if not found. E.g.:: my_user = session.get(User, 5) some_object = session.get(VersionedFoo, (5, 10)) some_object = session.get(VersionedFoo, {"id": 5, "version_id": 10})

(
        self,
        entity: _EntityBindKey[_O],
        ident: _PKIdentityArgument,
        *,
        options: Optional[Sequence[ORMOption]] = None,
        populate_existing: bool = False,
        with_for_update: ForUpdateParameter = None,
        identity_token: Optional[Any] = None,
        execution_options: OrmExecuteOptionsParameter = util.EMPTY_DICT,
        bind_arguments: Optional[_BindArguments] = None,
    )

                self._delete_impl(st_, o, False)

    def get(
        self,
        entity: _EntityBindKey[_O],
        ident: _PKIdentityArgument,
        *,
        options: Optional[Sequence[ORMOption]] = None,
        populate_existing: bool = False,
        with_for_update: ForUpdateParameter = None,
        identity_token: Optional[Any] = None,
        execution_options: OrmExecuteOptionsParameter = util.EMPTY_DICT,
        bind_arguments: Optional[_BindArguments] = None,
    ) -> Optional[_O]:
        """Return an instance based on the given primary key identifier,
        or ``None`` if not found.

        E.g.::

            my_user = session.get(User, 5)

            some_object = session.get(VersionedFoo, (5, 10))

            some_object = session.get(VersionedFoo, {"id": 5, "version_id": 10})

        .. versionadded:: 1.4 Added :meth:`_orm.Session.get`, which is moved
           from the now legacy :meth:`_orm.Query.get` method.

        :meth:`_orm.Session.get` is special in that it provides direct
        access to the identity map of the :class:`.Session`.
        If the given primary key identifier is present
        in the local identity map, the object is returned
        directly from this collection and no SQL is emitted,
        unless the object has been marked fully expired.
        If not present,
        a SELECT is performed in order to locate the object.

        :meth:`_orm.Session.get` also will perform a check if
        the object is present in the identity map and
        marked as expired - a SELECT
        is emitted to refresh the object as well as to
        ensure that the row is still present.
        If not, :class:`~sqlalchemy.orm.exc.ObjectDeletedError` is raised.

        :param entity: a mapped class or :class:`.Mapper` indicating the
         type of entity to be loaded.

        :param ident: A scalar, tuple, or dictionary representing the
         primary key.  For a composite (e.g. multiple column) primary key,
         a tuple or dictionary should be passed.

         For a single-column primary key, the scalar calling form is typically
         the most expedient.  If the primary key of a row is the value "5",
         the call looks like::

            my_object = session.get(SomeClass, 5)

         The tuple form contains primary key values typically in
         the order in which they correspond to the mapped
         :class:`_schema.Table`