Method _bulk_save_mappings

lib/sqlalchemy/orm/session.py:4727–4768

(
        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)

        try:
            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