2012/5/26 Bruce Momjian <bruce@momjian.us>:
> On Sat, May 26, 2012 at 12:43:40PM -0400, Tom Lane wrote:
>> Bruce Momjian <bruce@momjian.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
>
> Wouldn't you just us unaligned mode for this, and set IFS to '|'?
>
> $ psql --no-align --tuples-only -c 'SELECT 1,2' test
> 1|2
>
> $ export IFS="|"
> $ IFS='|' sql --no-align --tuples-only -c 'SELECT 1,2' test |
> while read x y; do echo $x; echo $y; done
> 1
> 2
>
> Are you worried about pipes in data? Does you idea fix this?
I can do use IFS, but it is not easy when you would to work with
multicolumn tables - because you have to two IFS. Processing single
column tables is simple now - difference is in multicolumn tables.
My idea is secure to separator - because separator is just space and
new line and these symbols are escaped.
Regards
Pavel
>
> --
> Bruce Momjian <bruce@momjian.us> http://momjian.us
> EnterpriseDB http://enterprisedb.com
>
> + It's impossible for everything to be true. +
