[R] ROracle/DBI problem with dbExecStatement on RH Linux

Sunny Ho sunny.ho at gmail.com
Tue Dec 14 06:53:30 CET 2004

Hi Simon,

I believe you are not using the right syntax for dbExecStatement(). In
particular, you should first use dbPrepareStatement, then
dbExecStatement to execute a "prepared" statement. You may do a "?
dbExecStatement" to read their usage. After some experimenting, I
found that using dbSendQuery is much easier for the 'select' operation
(the name 'Query' may imply that it is written just for the purpose of
'select'). For other operations (insert & delete, etc), then
dbPrepareStatement & dbExecStatement could be more appropriate.

My 2 cents, it is worth the effort to read the ROracle.pdf that comes
with the ROracle package.

Sunny Ho (sunny.ho at gmail.com)

> Date: Thu, 09 Dec 2004 13:06:52 +0000
> From: Simon Holgate <simonh at pol.ac.uk>
> Subject: [R] ROracle/DBI problem with dbExecStatement on RH Linux
> To: r-help at stat.math.ethz.ch
> Message-ID: <41B84DEC.3090902 at pol.ac.uk>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> Hi,
> first thanks to Sunny Ho (and David James for the pointer) for resolving
> the problem of the empty rows returned from ROracle.
> However, I have a problem still:
>   > library(ROracle)
>   > ora <- dbDriver("Oracle")
>   > con <- dbConnect(ora, user = USER, password = PWD, dbname = DBNAME)
>   > rs <- dbExecStatement(con, "select * from USER_TABLES")
>  Error in .class1(object) : No direct or inherited method for function
>  "dbExecStatement" for this call
> dbSendQuery/dbGetQuery work fine. I've reinstalled ROracle 0.5-5 and DBI
> 0.1-8 from source on RH Linux Enterprise WS release 3 Taroon update;
> kernel 2.4.21-9.0.1; Oracle; R 1.9.1.
> Any suggestions on resolving this would be much appreciated.
> Cheers,
> Simon

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