Mod_rewrite module on Oracle 9ias

Hello Everyone,

I am trying to use mod_rewrite in httpd.conf file to filter all incoming url's with unwanted characters.

Currently the incoming url is being filtered but the query string (parameters and the data values) is not, is there a way to force to
add query string to the rewrite rule.

OR

Is there a simple soluction, where we can have a common procedure in the database that will be called from each incoming requests, that way I can have my filtering code in that function.

Regards
Umakanth