[R] Reading Text Files with RODBC

Nutter, Benjamin NutterB at ccf.org
Thu Feb 16 21:29:46 CET 2012

Ah, yes.  If you can't find the answer to your question, ask a different question!

sqldf does, indeed, do what I want.  Thank you

  Benjamin Nutter |  Biostatistician     |  Quantitative Health Sciences
  Cleveland Clinic    |  9500 Euclid Ave.  |  Cleveland, OH 44195  | (216) 445-1365

-----Original Message-----
From: Gabor Grothendieck [mailto:ggrothendieck at gmail.com] 
Sent: Thursday, February 16, 2012 1:15 PM
To: Nutter, Benjamin
Cc: r-help at r-project.org
Subject: Re: [R] Reading Text Files with RODBC

On Thu, Feb 16, 2012 at 10:12 AM, Nutter, Benjamin <NutterB at ccf.org> wrote:
> I'm thoroughly stumped.  I've been playing with RODBC and wanted to see if I could retrieve data from text files using this package as well (for the most part, this is an intellectual exercise, but occasionally I do get data files large enough in CSV format RODBC could be helpful) .
> I set up a DNS called "Text Files" and then ran the following code in 
> R
>> library(RODBC)
>> mtg <- odbcConnect("Text Files")
>> sqlTables(mtg)
>                         TABLE_CAT TABLE_SCHEM    TABLE_NAME  
> 1 C:\\USERS\\NUTTERB                   <NA>    Core2012.txt              
> TABLE                 <NA>
> 2 C:\\USERS\\NUTTERB                   <NA> MTGCards.csv              
> TABLE                 <NA>
>> sqlFetch(mtg, "MTGCards.csv")
> Error in odbcTableExists(channel, sqtable) :
>  'MTGCards.csv': table not found on channel
> MTGCards.csv is an export from an MS Access database, and I'm able to get it out of Access, and I'm also able to connect to our Oracle databases.  So I'm not sure what it is I'm not getting about reading the text files.  If anyone has done this successfully and has any pointers, I'd appreciate it.  So far I've not been able to solve it with documentation from RODBC, RStudio (I get the same error messages when I use the RGui), or Microsoft ODBC drivers.

This isn't precisely what you are asking for but if the idea is to apply an sql statement to a csv file then read.csv.sql in the sqldf package can apply an sql statement to a csv file reading the result into R.  If you omit the sql statement then it reads it all in.

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email: ggrothendieck at gmail.com


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