On Thu, Jul 30, 2009 at 11:44:31AM -0400, Stef Telford wrote:
> < decimal = PyImport_ImportModule("decimal");
> ---
> > decimal = PyImport_ImportModule("gmpy");
>
> Kind of a 'no-brainer' there but, since psycopg is a compiled
> extension, I don't see how we can monkey patch the C lib :(
Well, I think it's too low-level. I am sure psycopg is better than that.
Python is dynamic, and I'm sure it's possible to find a dynamic way around
builtin module names.
Let's look around. import psycopg2._psycopg; print dir(psycopg2._psycopg)...
aha, types and adapters. There is a DECIMAL type converter, and there is a
psycopg2._psycopg.string_types dict where the converter is registered under
the key 1700. What 1700? grep 1700 *
pgtypes.h:#define NUMERICOID 1700
typecast_builtins.c:static long int typecast_NUMBER_types[] = {20, 23, 21, 701,
700, 1700, 0};
typecast_builtins.c:static long int typecast_DECIMAL_types[] = {1700, 0};
Seems 1700 is a builtin index for DECIMAL type converter. I don't know
how exactly type converters are used; I am sure you can find this out by
reading psycopgmodule.c or by asking a psycopg mailing list. Probably you
need to replace DECIMAL or 1700 type converter, or both. Something like
psycopg2._psycopg.DECIMAL = my_decimal_converter
or
psycopg2._psycopg.string_types[1700] = my_decimal_converter
Exact details will require a lot of homework, sure.
> Lastly, I have also hacked my version of SQLObject to disable the
> local cache, so that SO can use memcache (by subclassing the sqlobject
> and then making custom get/setattr methods). It would be nice if there
> was a way to toggle the cache on/off at the SO level (if there is, I
> haven't found it sadly).
There is no way currently. Why not to add it? Extend your hack so it'd
be possible to configure caching using a flag in sqlmeta; let's call it
useCache = True/False (defaults to True).
Publish your patch.
Oleg.
--
Oleg Broytmann http://phd.pp.ru/ [email protected]
Programmers don't die, they just GOSUB without RETURN.
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