On Wed, Feb 13, 2013 at 5:17 PM, Aleksey Tsalolikhin
<atsaloli.tech@xxxxxxxxx> wrote:
> Below is an example of feeding query output to gnuplot without leaving psql.
> I'd like to call it as "select graph(select * from example)", just for fun.
> What do I need to learn to do that, please? Can I create a function that
> uses "\o"? I think not, because a function runs server-side and \o is a
> client side feature.
plpython/plperl/etc plus this way of calling
select just_for_fun_graph('select ... from ...', 'My Graph', 78, 24, ...)
will do the trick.
>
> This is not a production issue, just learning, for fun.
>
> # psql -U postgres
> psql (8.4.15)
> Type "help" for help.
>
> postgres=# \t
> Showing only tuples.
> postgres=# \a
> Output format is unaligned.
> postgres=# \f ' '
> Field separator is " ".
> postgres=# select * from example;
> 1 1
> 2 2
> 3 3
> 4 4
> postgres=# \o | /usr/bin/gnuplot
> postgres=# select 'set title "My Graph"; set terminal dumb 78 24; set key
> off; set ylabel "Time"; set xlabel "Servers";' || 'plot ''-'' with lines;' ;
> select * from example;
> postgres=# \o
>
> My Graph
> Time
> 4
> ++----------+----------+-----------+----------+-----------+---------**
> + + + + + +
> **** +
> | **** |
> 3.5 ++ **** ++
> | **** |
> | **** |
> 3 ++ *** ++
> | **** |
> | **** |
> 2.5 ++ **** ++
> | **** |
> | **** |
> 2 ++ *** ++
> | **** |
> | **** |
> 1.5 ++ **** ++
> | **** |
> + **** + + + + + +
> 1 **----------+----------+-----------+----------+-----------+---------++
> 1 1.5 2 2.5 3 3.5 4
> Servers
>
> postgres=#
>
> Best,
> Aleksey
>
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