Evgeny Smirnov <evgeny(dot)v(dot)smirnov(at)gmail(dot)com> writes:
> A Postgresql backend is capable of operating multiple portals within a
> transaction and switching between them on and off. For instance such a code
> results in an expected outcome:
> ...
> Is the same possible for conventional selects issued with extended query
> protocol?
AFAIR, a portal is a portal. Have you tried it? If it didn't do
what you expected, please provide a less handwavy example.
regards, tom lane