[Bioc-devel] Error during wrapup, what does this mean?

hi, it's again me, but i found the problem...
as i am working with database connections and if an error occurs in a 
function call i want to roll back the whole stuff that has been written 
into a database, i thought to be smart and defined with

options(error=expression(.rollItBack(Con)))

where .rollItBack is a function that sends the command ROLLBACK 
TRANSACTION to the database. well, i did not think, that when the error 
occurs the object Con, which is a local variable in the function does 
not exist, unless the user has called the connection object also 'Con'.

now i want to ask how i can define a global variable from within a 
function.

cheers, jo

Quoting "Dipl.-Ing. Johannes Rainer" <johannes.rainer@tugraz.at>:

hi,
i am getting the error message:

Error during wrapup: Object "Con" not found

in my functions and have no idea from where this message comes (i have 
renamed some function arguments from 'Con' to 'con', maybe the message 
comes from there :) ). nevertheless i do not know where i should 
search for this error (as the functions work like they should...). can 
anybody tell me more to this error message?

cheers, jo