Re: [R] RODBC and sqlColumns

From: Ben Stabler <bstabler_at_ptvamerica.com>
Date: Thu 18 Aug 2005 - 00:52:42 EST


Ok, I understand that. Then, how do I get the columns for a table that is housed in a schema? And, second, why does the following not work (or at least partially work). It creates the new table in the X schema but then does not populate the table (and returns a sqlColumns() error.

sqlSave(db,x,"X.test",T,F)

Thanks.

Ben Stabler
Project Manager
PTV America, Inc.
1128 NE 2nd St, Suite 204
Corvallis, OR 97330
541-754-6836 x205
541-754-6837 fax
www.ptvamerica.com

-----Original Message-----
From: Prof Brian Ripley [mailto:ripley@stats.ox.ac.uk] Sent: Wednesday, August 17, 2005 12:59 AM To: Ben Stabler
Cc: r-help@stat.math.ethz.ch
Subject: Re: [R] RODBC and sqlColumns

AFAIK "." is not a valid part of an SQL table name. I think the help files
are perfectly clear as to what is supported:

  sqtable: character: a database table name accessible from the

           connected dsn.

Why do you think "X.test" is a `database table name'?

On Tue, 16 Aug 2005, Ben Stabler wrote:

> I have a Postgres database that I am connecting to with the Postgres
> ODBC driver on Windows XP in R 2.1.0. In the database is a database
> with two schemas (public and X). With RODBC (1.1-4) , I can connect
> to the database and get the tables with sqlTables(db). I can query
> tables in the schema with sqlQuery("SELECT * FROM X.test"). However,
> I can't get the columns in table X.test with sqlColumns(db,"X.test")
> //it returns
>
> Error in sqlColumns(db, "X.test") : 'X.test': table not found on
> channel
>
> If I do
>
> sqlColumns(db, "test") it returns
> [1] TABLE_QUALIFIER TABLE_OWNER TABLE_NAME COLUMN_NAME
> DATA_TYPE
> [6] TYPE_NAME PRECISION LENGTH SCALE
> RADIX
> [11] NULLABLE REMARKS COLUMN_DEF
SQL_DATA_TYPE
> SQL_DATETIME_SUB
> [16] CHAR_OCTET_LENGTH ORDINAL_POSITION IS_NULLABLE
DISPLAY_SIZE
> FIELD_TYPE
> <0 rows> (or 0-length row.names)
>
> But there is no test table defined anywhere else but the X schema. If

> I do sqlSave(db,aDataFrame,"X.test",T,F), it says test already
> defined. If I change the aDataFrame to be different than the fields
> actually in the data, then R starts to create a new table but returns
>
> Error in sqlColumns(db, "X.test") : 'X.test': table not found on
> channel
>
> It seems to be having problems with what is returned by the
> columns.....since
>
> Error in sqlSave(db, aDataFrame, "X.test", T, F) :
> [RODBC] ERROR: Could not SQLExecDirectS1000 7 ERROR: relation
> "test" already exists
>
> but if I change the input table to be different....then R can create
> the table, but fails to populate it. I checked the db in PgAdmin and
> the table is created by the sqlSave call. All this stuff works if I
> don't use a schema "schema.table". So it appears there is something
> wrong in some place dealing with understanding the columns for tables
> in schemas.
>
> Any ideas? Any help would be much appreciated. Thank you.

-- 
Brian D. Ripley,                  ripley@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

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Received on Thu Aug 18 00:59:43 2005

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