Re: psql - add special variable to reflect the last query status

From: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: psql - add special variable to reflect the last query status
Date: 2017-09-11 18:46:27
Message-ID: alpine.DEB.2.20.1709112042050.8852@lancre
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>>> I think you're overly optimistic to believe that every failure will
>>> have a SQLSTATE; I don't think that's true for libpq-reported errors,
>>> such as connection loss.
>> Yep, I thought I was optimistic:-) Can I add a special SQLSTATE for that
>> situation where libpq did not report an error?
> Meh. If we're going to do that I think it might be better to hack
> libpq itself to do so, ie, force PQresultErrorField(..., PG_DIAG_SQLSTATE)
> to always return something. But it seems like a hack either way.

I would not have took the liberty to hack into libpq internals for such a
small front-end feature. However I agree that having libpq always return
some diagnostic, even if it means "something unclear happened, sorry not
to be very precise", would be better.


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