From: | Hannu Krosing <hannu(at)krosing(dot)net> |
---|---|
To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
Cc: | Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "David E(dot) Wheeler" <david(at)kineticode(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: RfD: more powerful "any" types |
Date: | 2009-09-09 20:43:28 |
Message-ID: | 1252529008.4080.21.camel@hvost1700 |
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Thread: | |
Lists: | pgsql-hackers |
On Wed, 2009-09-09 at 21:57 +0200, Pavel Stehule wrote:
> 2009/9/9 Alvaro Herrera <alvherre(at)commandprompt(dot)com>:
> > Pavel Stehule escribió:
> >> 2009/9/9 Alvaro Herrera <alvherre(at)commandprompt(dot)com>:
> >
> >> > I already published a pseudo-sprintf function in the wiki here:
> >> > http://wiki.postgresql.org/wiki/Sprintf I'm looking for something
> >> > better, not just the same hacks.
> >> >
> >> > I don't see any good reason that the function needs to be far from core.
> >>
> >> what is use case? Why you need sprintf function, when you have ||
> >> operator. This functionality is redundant and out of standard. What I
> >> know, only MySQL has similar function.
> >
> > Extensive use of || turns into horrible messes quickly. sprintf() makes
> > this kind of thing much cleaner. You could use strcat/strcpy in C too,
> > but do you? You could argue that sprintf is redundant in C, yet it
> > turns out to be extremely useful.
> >
>
> Yes, I agree. But this functionality you will use only in plpgsql
> language. I thing, so there could be some library that should be
> separated from standard functions. It would be nice, when people
> clearly understand if use some enhancing functionality or some base
> sql functionality.
There is lots of stuff in postgreSQL, especially functions, that is not
"some base sql functionality", yet is in core.
>
> we could to have schema plpgsql. And there could be function subst,
>
> then in your plpgsql proc you can call
>
> if (...) then
> message := plpgsql.subst('some message:% ...', some value, ...);
> ....
>
> if you would, then you can add plpgsql schema to search path.
>
> I dislike to use name sprintf, because this or similar function isn't
> real sprintf function - it doesn't use compatible format string with
> sprintf function.
call it format(txt, variadic "any") - that's what it does
> regards
> Pavel Stehule
>
> > One use case is using it for error messages in RAISE/USING. Yes, I am
> > aware you can use concatenation there.
> >
> > --
> > Alvaro Herrera http://www.CommandPrompt.com/
> > PostgreSQL Replication, Consulting, Custom Development, 24x7 support
> >
>
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