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

James W. MacDonald jmacdon at med.umich.edu
Fri May 20 16:15:56 CEST 2005

Dipl.-Ing. Johannes Rainer wrote:
> 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.

See ?"<<-" and ?assign



> cheers, jo
> Quoting "Dipl.-Ing. Johannes Rainer" <johannes.rainer at 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
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James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109

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