Re: Different handling of PL/pgSQL for-loop variables in 8.3.7 vs. 8.2.7 ???

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: depesz(at)depesz(dot)com
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Atul Chojar <achojar(at)airfacts(dot)com>, pgsql-general(at)postgresql(dot)org, Li <lilian(dot)ying(at)airfacts(dot)com>, Andy Yoder <ayoder(at)airfacts(dot)com>
Subject: Re: Different handling of PL/pgSQL for-loop variables in 8.3.7 vs. 8.2.7 ???
Date: 2009-06-11 12:17:33
Message-ID: 162867790906110517m221cc714w4abc61167ab23e8e@mail.gmail.com
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-admin pgsql-general

2009/6/11 hubert depesz lubaczewski <depesz(at)depesz(dot)com>:
> On Thu, Jun 11, 2009 at 12:45:56PM +0200, Pavel Stehule wrote:
>> generally - modification of cycle's control variable isn't good
>> technique, because it's should be broken by some optimizations. When
>
> i would argue then that these optimizations are broken, then.
>
>> you would to modify this some variables, then use "while-loop"
>> instead.
>
> while technically possible, i find for loops much more straight forward,
> and clearer to understand.
>

sure, forloop is clean, but not when you do some alchemy with control
variables. When you need increase step, then use BY clause. But I
thing, so it's easy protect users by marking control variables as read
only variable.

regards
Pavel Stehule

> Best regards,
>
> depesz
>
> --
> Linkedin: http://www.linkedin.com/in/depesz  /  blog: http://www.depesz.com/
> jid/gtalk: depesz(at)depesz(dot)com / aim:depeszhdl / skype:depesz_hdl / gg:6749007
>

In response to

Browse pgsql-admin by date

  From Date Subject
Next Message Emanuel Calvo Franco 2009-06-11 15:01:10 Re: Sobre Actualizacion
Previous Message hubert depesz lubaczewski 2009-06-11 11:00:17 Re: Different handling of PL/pgSQL for-loop variables in 8.3.7 vs. 8.2.7 ???

Browse pgsql-general by date

  From Date Subject
Next Message Greg Stark 2009-06-11 12:22:25 Re: queries on xmin
Previous Message Brett Henderson 2009-06-11 12:13:29 Re: queries on xmin