[R] is library loaded

[Omar Lakkis]

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.