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Can the backend return more than one error message per PQexec?

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org>
Subject: Can the backend return more than one error message per PQexec?
Date: 2001-06-05 19:50:38
Message-ID: Pine.LNX.4.30.0106052138430.900-100000@peter.localdomain (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
In PQexec() and also in parseInput() (both fe-exec.c) there is a provision
for, if more than one result set is returned, to concatenate the error
messages (while only returning the last result set).  My question is how a
backend can return more than one error message per query string?  The
description of the protocol indicates that an ErrorResponse will either
cause a connection close or the end of a query cycle.

I am currently looking into extending the protocol so that more fields can
be in an ErrorResponse (e.g., error codes).  If this were to happen then
we'd need a smarter way of handling more than one error message per cycle.
However, I'd rather avoid that case in the first place.

Peter Eisentraut   peter_e(at)gmx(dot)net


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