[python-win32] advice on architecting or program design in python:

Tim Golden mail at timgolden.me.uk
Tue Mar 11 12:11:45 CET 2008

mark.a.brand wrote:
> sorry - client as in customer

Ah. I see. (Didn't think of that :)

> i will try and explain better, but its not quite clear in my mind what is
> achievable ...
> so to build up these database tables, i have to have some queries happening
> of the form :
> for list in Win32_Process()
>  add instance to table-process
> for list in Win32_Service()
>  add instance to table-service
> ...
> etc etc for each Win32_* query i wanted to implement.
> what I am looking for is an object based / pythonic way to replace all those
> "for loops". 

Certainly possible at several levels. There are a number
of ORM packages around, but the general favourite is probably
sqlalchemy [1] and its spin-off Elixir [2]. That said, there's
nothing to stop you working straight at the DBAPI [3] level
and calling .executemany against the tables you want.

Certainly you could have your table structure exactly mimic
the "column" structure of the corresponding WMI class and
push things along a bit that way. It's fairly trivial to
turn the WMI attribute values into a dictionary which could
then be passed on to something like Elixir's row-creation.

<vague hand-wavy code>
import os, sys
from elixir import *
import wmi

DB_FILENAME = os.path.abspath ("wmi.db")
metadata.bind = "sqlite:///%s" % DB_FILENAME

class Process (Entity):

   ProcessId = Field (Integer, primary_key=True)
   Caption = Field (Unicode (100))

if __name__ == '__main__':
   setup_all (True)
   c = wmi.WMI ()
   for process in c.Win32_Process (['ProcessId', 'Caption']):
     d = dict ((p, getattr (process, p)) for p in process.properties)
     Process (**d)

   session.flush ()
   session.close ()


Obviously, this is a mere stub but it does at least work
and might be a useful basis. There is definite scope for
factoring things out but you might do better just to have
a function which took -- or inferred -- the relevant class
and table names. YMMV.

> thanks for you assistance tim.

Glad to be of service



[1] http://sqlalchemy.org
[2] http://elixir.ematia.de/trac/wiki
[3] http://www.python.org/dev/peps/pep-0249/

More information about the python-win32 mailing list