loading both RPostgreSQL and RSQLite leads to problems

hi martin,

i have installed 2.15.2 and tried your code example below, but
i still get the same error:

library(RSQLite)

Loading required package: DBI

library(RPostgreSQL)
dbDriver('PostgreSQL')

Error in function (classes, fdef, mtable)  :
   unable to find an inherited method for function  show  for signature  "PostgreSQLDriver"


are you able run this successfully in 2.15.2?

thanks
jon.


On Aug 23, 2012, at 12:38 PM, Martin Morgan wrote:

On 08/22/2012 01:35 PM, Jon McAuliffe wrote:

hello,

if i load the RSQLite package in addition to the RPostgreSQL package,
i get various errors when trying to use RPostgreSQL functions. here is
an example transcript showing one such error:


==========================================================
R version 2.15.0 (2012-03-30)
[...]

packageVersion('RPostgreSQL')

[1]  0.3.2

packageVersion('RSQLite')

[1]  0.11.1

library(RPostgreSQL)

Loading required package: DBI

dbDriver('PostgreSQL')

<PostgreSQLDriver:(32540)>

library(RSQLite)
dbDriver('PostgreSQL')

Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function "show", for signature "PostgreSQLDriver"

Hi Jon --

It seems like this has been addressed in the devel version of R

library(RSQLite)

Loading required package: DBI

library(RPostgreSQL)
dbDriver("PostgreSQL")

An object of class "PostgreSQLDriver"
Slot "Id":
[1] 12355

sessionInfo()

R Under development (unstable) (2012-08-20 r60336)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
[1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C                 LC_NAME=C
[9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] RPostgreSQL_0.3-2    RSQLite_0.11.1       DBI_0.2-5

==========================================================


below is the output of showMethods('show') in two scenarios:
(1) RPostgreSQL loaded, RSQLite not loaded;
(2) RPostgreSQL loaded, RSQLite loaded (in that order).
i'd be grateful for any help resolving or working around this issue.
if possible, please include my email address in any reply.

best
jon mcauliffe
jon at mcauliffe.com



(1)

showMethods('show')

Function: show (package methods)
object="ANY"
object="classGeneratorFunction"
object="classRepresentation"
object="dbObjectId"
object="envRefClass"
object="function"
    (inherited from: object="ANY")
object="genericFunction"
object="genericFunctionWithTrace"
object="MethodDefinition"
object="MethodDefinitionWithTrace"
object="MethodSelectionReport"
object="MethodWithNext"
object="MethodWithNextWithTrace"
object="namedList"
object="ObjectsWithPackage"
object="oldClass"
object="PostgreSQLDriver"
    (inherited from: object="dbObjectId")
object="refClassRepresentation"
object="refMethodDef"
object="refObjectGenerator"
object="signature"
object="sourceEnvironment"
object="standardGeneric"
    (inherited from: object="genericFunction")
object="traceable"


(2)

showMethods('show')

Function: show (package methods)
object="ANY"
object="classGeneratorFunction"
object="classRepresentation"
  (2 methods defined for this signature, with different packages)
object="envRefClass"
object="genericFunction"
object="genericFunctionWithTrace"
object="MethodDefinition"
object="MethodDefinitionWithTrace"
object="MethodSelectionReport"
object="MethodWithNext"
object="MethodWithNextWithTrace"
object="namedList"
object="ObjectsWithPackage"
object="oldClass"
object="refClassRepresentation"
object="refMethodDef"
object="refObjectGenerator"
object="signature"
object="sourceEnvironment"
object="traceable"

--
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109

Location: Arnold Building M1 B861
Phone: (206) 667-2793