Method tpc_prepare

psycopg/psycopg/connection.py:535–543

Perform the first phase of a transaction started with `tpc_begin()`.

(self)

            self.wait(self._tpc_begin_gen(xid))

    def tpc_prepare(self) -> None:
        """
        Perform the first phase of a transaction started with `tpc_begin()`.
        """
        try:
            with self.lock:
                self.wait(self._tpc_prepare_gen())
        except e.ObjectNotInPrerequisiteState as ex:
            raise e.NotSupportedError(str(ex)) from None

    def tpc_commit(self, xid: Xid | str | None = None) -> None:
        """