Skip site navigation (1) Skip section navigation (2)

Re: VIP: new format for psql - shell - simple using psql in shell

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: VIP: new format for psql - shell - simple using psql in shell
Date: 2012-05-26 16:50:17
Message-ID: CAFj8pRANcwXEK6+--WwzgENLgq7F6mQdP5O-VXex85=dYSeP7w@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
2012/5/26 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> Bruce Momjian <bruce(at)momjian(dot)us> writes:
>> On Sat, May 26, 2012 at 05:39:23PM +0200, Pavel Stehule wrote:
>>> I proposed new psql's format "shell". This format is optimized for
>>> processing returned result in shell:
>
>> I am unclear exactly how this relates to shells.
>
> What I'm unclear on is why we'd want to encourage that style of
> programming.  The most charitable prediction of performance is that it
> would suck --- not only do you have all the inefficiencies inherent in
> row-by-row result processing with a shell script, but you're forcing a
> separate database connection for each query.  And I don't actually see
> where it would be especially convenient to use, compared to say perl
> or python or other scripting languages.  I'd rather see us worrying
> about the convenience of cases like
>
>        psql ... | perl -e ...

A performance is not important in this case - typical use case for
this feature are simple tasks - some simple maintaining - where people
can prepare SQL in psql, and later can reuse knowledge in some simple
scripts. Shell has one significant advantage against perl or python -
is everywhere (on UNIX) and it is best for very simple tasks.

Regards

Pavel



>
>                        regards, tom lane

In response to

Responses

pgsql-hackers by date

Next:From: Bruce MomjianDate: 2012-05-26 17:24:47
Subject: Re: VIP: new format for psql - shell - simple using psql in shell
Previous:From: Tom LaneDate: 2012-05-26 16:43:40
Subject: Re: VIP: new format for psql - shell - simple using psql in shell

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group