[R] RODBC under Windows
apjaworski at mmm.com
Wed Mar 20 01:25:11 CET 2002
I have been just playing with the ODBC connectivity under Windows. I have
never done this before and I thought I would go through some examples in
the "Data Import/Export" manual and learn how to setup data connections
while doing that. I ran into a small problem and I am not sure if this is
something I am doing wrong or a bug or, perhaps, a feature of the RODBC
Here is what I did:
(1) I created an empty Excel file (workbook).
(2) I setup this file as a data source named "Excel Test" using Data
Sources(ODBC) under Control Panel/Administrative Tools (I am using
(3) In R I did
cc <- odbcConnect("Excel Test")
sqlSave(cc, USArrests, rownames="States")
sqlTables(cc) # shows the Sheet1$ and
USArrests$ as system tables and USArrests as a table
sqlQuery(cc, "select state, murder from USArrests") # works
sqlQuery(cc, "select state, murder from USArrests where rape>30")
This last statement gives me a type mismatch error. After disconnecting
and inspecting the Excel file I discovered that all the values were saved
I thought that this was peculiar to Excel so I repeated the whole procedure
with an Access database. The same thing - all the data were saved as text.
I can go to the database and change them by hand to numbers and then the
last query above works fine.
Am I doing something wrong? Is this how things are supposed to work?
Thanks in advance,
Engineering Systems Technology Center
3M Center, 518-1-01
St. Paul, MN 55144-1000
E-mail: apjaworski at mmm.com
Tel: (651) 733-6092
Fax: (651) 736-3122
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