Re: [R] RSQLite problems

From: Roger D. Peng <rpeng_at_jhsph.edu>
Date: Fri 28 Oct 2005 - 04:35:04 EST

I encountered this too, and my limited investigation (both on the web and in R) was unable to find a work around.

-roger

Na Li wrote:
> Hi, I'm experimenting with using (R)SQLite to do data management. Here are
> two little problems that I've encountered:
>
> 1. The presence of ',' in string values causes trouble since ',' is also the
> delimiter used in the SQL statement.
>
> 2. A newline '\n' line attached to the last string value of each row.
>
> Some examples:
>
>

>>library (RSQLite)

>
> Loading required package: DBI
>
>>sqlite <- dbDriver ("SQLite")
>>db <- dbConnect (sqlite, dbname = "test.dbms")
>>data (barley)
>>dbWriteTable (db, "barley", barley, overwrite = TRUE)

>
> [1] TRUE
>
>>barley[1:3,]

>
> yield variety year site
> 1 27.00000 Manchuria 1931 University Farm
> 2 48.86667 Manchuria 1931 Waseca
> 3 27.43334 Manchuria 1931 Morris
>
>>dbReadTable (db, "barley")[1:3,]

>
> yield variety year__1 site
> 1 27.00000 Manchuria 1931 University Farm\n
> 2 48.86667 Manchuria 1931 Waseca\n
> 3 27.43334 Manchuria 1931 Morris\n
>
>
>>barley$site <- as.character (barley$site)
>>barley$site[1] <- "University, Farm"
>>dbWriteTable (db, "barley", barley, overwrite = TRUE)

>
> Error in sqliteWriteTable(conn, name, value, ...) :
> RS-DBI driver: (RS_sqlite_import: /tmp/RtmpgSNaLn/rsdbi6a5d128c line 1
> expected 5 columns of data but found 6)
>
> I'm using RSQLite 0.4.0 with R 2.1.1 on Mac OS X.
>
> Cheers,
>
> Michael
>
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-- 
Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/

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Received on Fri Oct 28 04:45:54 2005

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