stk-sample/lambda/stk-player-events-loader-pg/package/pg8000/dbapi.py [713:795]:
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    def tpc_commit(self, xid=None):
        """When called with no arguments, .tpc_commit() commits a TPC
        transaction previously prepared with .tpc_prepare().

        If .tpc_commit() is called prior to .tpc_prepare(), a single phase
        commit is performed. A transaction manager may choose to do this if
        only a single resource is participating in the global transaction.

        When called with a transaction ID xid, the database commits the given
        transaction. If an invalid transaction ID is provided, a
        ProgrammingError will be raised. This form should be called outside of
        a transaction, and is intended for use in recovery.

        On return, the TPC transaction is ended.

        This function is part of the `DBAPI 2.0 specification
        <http://www.python.org/dev/peps/pep-0249/>`_.
        """
        if xid is None:
            xid = self._xid

        if xid is None:
            raise ProgrammingError("Cannot tpc_commit() without a TPC transaction!")

        try:
            previous_autocommit_mode = self.autocommit
            self.autocommit = True
            if xid in self.tpc_recover():
                self.execute_unnamed("COMMIT PREPARED '%s';" % (xid[1],))
            else:
                # a single-phase commit
                self.commit()
        finally:
            self.autocommit = previous_autocommit_mode
        self._xid = None

    def tpc_rollback(self, xid=None):
        """When called with no arguments, .tpc_rollback() rolls back a TPC
        transaction. It may be called before or after .tpc_prepare().

        When called with a transaction ID xid, it rolls back the given
        transaction. If an invalid transaction ID is provided, a
        ProgrammingError is raised. This form should be called outside of a
        transaction, and is intended for use in recovery.

        On return, the TPC transaction is ended.

        This function is part of the `DBAPI 2.0 specification
        <http://www.python.org/dev/peps/pep-0249/>`_.
        """
        if xid is None:
            xid = self._xid

        if xid is None:
            raise ProgrammingError(
                "Cannot tpc_rollback() without a TPC prepared transaction!"
            )

        try:
            previous_autocommit_mode = self.autocommit
            self.autocommit = True
            if xid in self.tpc_recover():
                # a two-phase rollback
                self.execute_unnamed("ROLLBACK PREPARED '%s';" % (xid[1],))
            else:
                # a single-phase rollback
                self.rollback()
        finally:
            self.autocommit = previous_autocommit_mode
        self._xid = None

    def tpc_recover(self):
        """Returns a list of pending transaction IDs suitable for use with
        .tpc_commit(xid) or .tpc_rollback(xid).

        This function is part of the `DBAPI 2.0 specification
        <http://www.python.org/dev/peps/pep-0249/>`_.
        """
        try:
            previous_autocommit_mode = self.autocommit
            self.autocommit = True
            curs = self.cursor()
            curs.execute("select gid FROM pg_prepared_xacts")
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stk-sample/lambda/stk-player-events-loader-pg/package/pg8000/legacy.py [543:625]:
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    def tpc_commit(self, xid=None):
        """When called with no arguments, .tpc_commit() commits a TPC
        transaction previously prepared with .tpc_prepare().

        If .tpc_commit() is called prior to .tpc_prepare(), a single phase
        commit is performed. A transaction manager may choose to do this if
        only a single resource is participating in the global transaction.

        When called with a transaction ID xid, the database commits the given
        transaction. If an invalid transaction ID is provided, a
        ProgrammingError will be raised. This form should be called outside of
        a transaction, and is intended for use in recovery.

        On return, the TPC transaction is ended.

        This function is part of the `DBAPI 2.0 specification
        <http://www.python.org/dev/peps/pep-0249/>`_.
        """
        if xid is None:
            xid = self._xid

        if xid is None:
            raise ProgrammingError("Cannot tpc_commit() without a TPC transaction!")

        try:
            previous_autocommit_mode = self.autocommit
            self.autocommit = True
            if xid in self.tpc_recover():
                self.execute_unnamed("COMMIT PREPARED '%s';" % (xid[1],))
            else:
                # a single-phase commit
                self.commit()
        finally:
            self.autocommit = previous_autocommit_mode
        self._xid = None

    def tpc_rollback(self, xid=None):
        """When called with no arguments, .tpc_rollback() rolls back a TPC
        transaction. It may be called before or after .tpc_prepare().

        When called with a transaction ID xid, it rolls back the given
        transaction. If an invalid transaction ID is provided, a
        ProgrammingError is raised. This form should be called outside of a
        transaction, and is intended for use in recovery.

        On return, the TPC transaction is ended.

        This function is part of the `DBAPI 2.0 specification
        <http://www.python.org/dev/peps/pep-0249/>`_.
        """
        if xid is None:
            xid = self._xid

        if xid is None:
            raise ProgrammingError(
                "Cannot tpc_rollback() without a TPC prepared transaction!"
            )

        try:
            previous_autocommit_mode = self.autocommit
            self.autocommit = True
            if xid in self.tpc_recover():
                # a two-phase rollback
                self.execute_unnamed("ROLLBACK PREPARED '%s';" % (xid[1],))
            else:
                # a single-phase rollback
                self.rollback()
        finally:
            self.autocommit = previous_autocommit_mode
        self._xid = None

    def tpc_recover(self):
        """Returns a list of pending transaction IDs suitable for use with
        .tpc_commit(xid) or .tpc_rollback(xid).

        This function is part of the `DBAPI 2.0 specification
        <http://www.python.org/dev/peps/pep-0249/>`_.
        """
        try:
            previous_autocommit_mode = self.autocommit
            self.autocommit = True
            curs = self.cursor()
            curs.execute("select gid FROM pg_prepared_xacts")
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