Re: PSQL commands: \quit_if, \quit_unless

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, PostgreSQL <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: PSQL commands: \quit_if, \quit_unless
Date: 2016-12-19 18:03:55
Message-ID: CAKFQuwYAPvbzATpZ81zuFWYC0MABqeF3ML4yMPMkwieMyUWkbA@mail.gmail.com
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On Mon, Dec 19, 2016 at 10:30 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:

>
> I see your point. Just out of curiosity, why in the world don't you
> use something other than psql for scripting? I mean, if you accessed
> the data from Perl or Python or
> $INSERT_YOUR_FAVORITE_SCRIPTING_LANGUAGE_HERE, you could do all of
> this stuff very easily without any contortions. I've always thought
> of psql as something that's fine for interactive use and goofy trivial
> scripting but not really suitable for serious work. I grant that you
> seem to be making it serve the purpose, but, man.
>

I'm coming to the realization that this sentiment, when applied to my
primary application, is probably correct...

In my situation the scripting language of choice is Bash - which largely
acts as glue for programs such as psql, pdftk, enscript, and the R language.

Being able to do more conditional work in psql would make setting up more
robust scripts easier and without either losing transaction capabilities or
session pooling for improved performance when large numbers of small
commands are run in between flow control in done in bash.

David J.

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