[R] SQLite: When reading a table, a "\r" is padded onto the last column. Why?

[Prof Brian Ripley]

I guess you are using package RSQLite without telling us (or telling us 
the version), and that your example is incomplete?

Using RSiteSearch("RSQLite Windows") quickly shows that this is a 
previously reported problem with the package, e.g.:

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/72515.html

I believe the issue is that RSQLite actually writes out a CRLF-terminated 
text file and imports that into SQLite.  (I checked version 0.4-15.) It 
seems function safe.write() needs to be modified to write to a binary-mode 
connection since SQLite appears to require LF-terminated files.

Using RODBC to work with SQLite databases works correctly even under
Windows (and is much more efficient at writing to the database).

[I am not sure who is actually maintaining RSQLite, so am Cc: both the 
stated maintainer and the person who prepared the package for 
distribution. The posting guide asked you to contact the maintainer: what 
response did _you_ get?]


On Wed, 3 Jan 2007, Søren Højsgaard wrote:

> Hi,
>
> I put the iris data into a SQLite database with
>
> dbWriteTable(con, "iris", iris, row.names=F, overwrite = T)
>
> Then I retrieve data from the database with
>
> rs  <- dbSendQuery(con, "select * from iris")
> d1  <- fetch(rs)
> dbClearResult(rs)
>
> Then I get
>> head(d1)
>  Sepal_Length Sepal_Width Petal_Length Petal_Width  Species
> 1          5.1         3.5          1.4         0.2 setosa\r
> 2          4.9         3.0          1.4         0.2 setosa\r
> 3          4.7         3.2          1.3         0.2 setosa\r
> 4          4.6         3.1          1.5         0.2 setosa\r
> 5          5.0         3.6          1.4         0.2 setosa\r
> 6          5.4         3.9          1.7         0.4 setosa\r
>
> Can anyone explain the extra "\r" at the end?  I am on Windows XP using R 2.4.1
> Thanks in advance
> Søren
>
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>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595