Method _bulk_save_mappings

lib/sqlalchemy/orm/session.py:4893–4932

(
        self,
        mapper: _EntityBindKey[_O],
        mappings: Union[Iterable[InstanceState[_O]], Iterable[Dict[str, Any]]],
        *,
        isupdate: bool,
        isstates: bool,
        return_defaults: bool,
        update_changed_only: bool,
        render_nulls: bool,
    )

        )

    def _bulk_save_mappings(
        self,
        mapper: _EntityBindKey[_O],
        mappings: Union[Iterable[InstanceState[_O]], Iterable[Dict[str, Any]]],
        *,
        isupdate: bool,
        isstates: bool,
        return_defaults: bool,
        update_changed_only: bool,
        render_nulls: bool,
    ) -> None:
        mapper = _class_to_mapper(mapper)
        self._flushing = True

        transaction = self._autobegin_t()._begin()
        try:
            if isupdate:
                bulk_persistence._bulk_update(
                    mapper,
                    mappings,
                    transaction,
                    isstates=isstates,
                    update_changed_only=update_changed_only,
                )
            else:
                bulk_persistence._bulk_insert(
                    mapper,
                    mappings,
                    transaction,
                    isstates=isstates,
                    return_defaults=return_defaults,
                    render_nulls=render_nulls,
                )
            transaction.commit()

        except:
            with util.safe_reraise():
                transaction.rollback(_capture_exception=True)
        finally:
            self._flushing = False

    def is_modified(
        self, instance: object, include_collections: bool = True