is library loaded

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch 
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Omar Lakkis
Sent: Tuesday, September 13, 2005 2:09 PM
To: r-help at stat.math.ethz.ch
Subject: [R] is library loaded

Is there a way to test if a library has been loaded?

is.loaded does not give me what I want, I am looking to say:

if loaded(Rdbi) dbSendQuery(conn, q)
if loaded(RODBC) sqlQuery(conn, q)

I need this to support both unix and windows platforms as I 
could not find a windows distribution for RdbiPgSQL. I am 
using R 2.1.0 and postgresql. I will be connecting to the 
database using Rdbi and RdbiPgSQL and have other developers 
using windows connect with RODBC, unless someone can suggest 
a better solution.