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Hi,
A couple of thoughts:
(1) The channel RODBC is an S3 object, thus there's no proper S4 class
associated with it. From ?setOldClass:
....
Description:
Register an old-style (a.k.a. `S3') class as a formally defined
class. The 'Classes' argument is the character vector used as the
'class' attribute; in particular, if there is more than one
string, old-style class inheritance is mimicked. Registering via
'setOldClass' allows S3 classes to appear in method signatures,
and as a slot in an S4 class if a prototype is included.
...
(2) This question may be more appropriate for r-devel?
HTH,
--
David
On 6/1/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Hi - I tried to get some answer before but there seems to have no one response.
My question is that I have a class like below definition:
setClass("DBManager",
representation(channel="RODBC"))
My purpose of the conn slot is to hold a channel to database connection which
is returned by a command like:
channel <- odbcConnect("DB", uid="user", pwd="password")
According to RODBC documentation, this channel is supposed to have a type of "RODBC".
However, if I declare my class as above, R will complain that it does not know about
"RODBC" type or class. Please clarify. Thank you.
- adschai
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