Convert string to command..

[Matimus]

On Oct 18, 9:09 am, Abandoned <best... at gmail.com> wrote:
> On Oct 18, 6:57 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
>
>
> > Abandoned wrote:
> > > On Oct 18, 6:35 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > >> Abandoned wrote:
> > >> > On Oct 18, 6:14 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > >> >> Abandoned wrote:
> > >> >> > Thanks you all answer..
> > >> >> > But "eval" is very slow at very big dictionary {2:3,4:5,6:19....}
> > >> >> > (100.000 elements)
> > >> >> > Is there any easy alternative ?
>
> > >> >> How big? How slow? For me, a 10000-element list takes  0.04 seconds to
> > >> >> be parsed. Which I find fast.
>
> > >> >> Diez
>
> > >> > 173.000 dict elements and it tooks 2.2 seconds this very big time for
> > >> > my project
>
> > >> Where does the data come from?
>
> > >> Diez
>
> > > Data come from database..
> > > I want to cache to speed up my system and i save the dictionary to
> > > database for speed up but eval is very slow for do this.
> > > Not: 2.2 second only eval operation.
>
> > Does the dictionary change often?
>
> > And you should store a pickle to the database then. Besides, making a
> > database-query of that size (after all, we're talking a few megs here) will
> > take a while as well - so are you SURE the 2.2 seconds are a problem? Or is
> > it just that you think they are?
>
> > Diez- Hide quoted text -
>
> > - Show quoted text -
>
> I'm very confused :(
> I try to explain main problem...
> I have a table like this:
> id-1 | id-2 | value
> 23     24       34
> 56     68       66
> 56     98       32455
> 55     62       655
> 56     28       123
> .... ( 3 millions elements)
>
> I select where id=56 and 100.000 rows are selecting but this took 2
> second. (very big for my project)
> I try cache to speed up this select operation..
> And create a cache table:
> id-1 | all
> 56    {68:66, 98:32455, 62:655}
>
> When i select where id 56 i select 1 row and its took 0.09 second but
> i must convert text to dictionary..
>
> Have you got any idea what can i do this conver operation ?
> or
> Have you got any idea what can i do cache for this table ?

I think several people have given you the correct answer, but for some
reason you aren't getting it. Instead of saving the string
representation of a dictionary to the database, pickle the dictionary
(not the string representation, but the actual dictionary) and save
the pickled object as a BLOB to the database. using pickle to re-
create the dictionary should be much faster than evaluating a string
representation of it.

Matt