[R-sig-DB] A question about dbWriteTable command in R under MS Windows

[Jeffrey Horner]

Hi,

HU,ZHENGJUN wrote on 03/10/2009 04:32 PM:
> Dear Sir/Madam,
> 
>  I wrote the following R code (see below) to store the data frame of 
> "test.01" into the table of "ttest01" in my database which is located on 
> a Linux machine. If the code was run under MS Windows XP, I have found 
> that the values in the last column (i.e. column f5) in the table are all 
> zeros instead of NULLs. If the same R code was run under Linux, however, 
> everything is OK. The R version is 2.6.0 under both MS Windows XP and 
> Linux.
> 
>  Does anyone know how to solve this problem under MS Windows XP?

I suggest you upgrade to the latest version of R and the latest version 
of RMySQL and run your test again. I doubt R 2.6.0 is the problem, but 
you haven't told us which version of RMySQL you are using. The latest 
version of RMySQL is 0.7-3, and a fix was made to dbWriteTable() in the 
0.7-2 version.

Best,

Jeff

> 
>  Thank you very much for the help and time in advance. Howard
> 
> ******************************************************************************************** 
> 
> library(DBI)
> library(RMySQL)
> mysqldrv <- dbDriver("MySQL")
> conn.2.database<- 
> dbConnect('myHostName','myUserName','myPassword','myDatabaseName')
> test.01=data.frame(f1=c("A","B","C"),f2=c(1,2,3),f3=c(NA,NA,NA),f4=c(NA,NA,NA),f5=c(NA,NA,NA)) 
> 
> dbWriteTable(conn.2.database, "ttest01", test.01, row.names=F, eol='\r\n')
> dbDisconnect(conn.2.database)
> 
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-- 
http://biostat.mc.vanderbilt.edu/JeffreyHorner