[python-win32] unable to read mssql varchar(max)

Preston Landers planders at gmail.com
Thu May 27 18:18:22 CEST 2010

varchar(max) columns are like CLOBs, character large objects, and I'm not
sure how well that odbc module handles them.   I ended up switching to
pyODBC which does handle them.  Unfortunately it might not be just a drop-in
replacement, and pyODBC does have its own issues.  But so far it's working
pretty well for us.


On Thu, May 27, 2010 at 10:56 AM, John <john at saponara.net> wrote:

> Hi,
> When a ms sql server database column was changed to varchar(max), my python
> code became unable to read that column.  no matter the actual value, python
> sees it as '\x00'.  I use sql server 2008, python 2.4, and pywin32-214.  it
> had worked when the column was a fixed size varchar, eg varchar(1000).
>  essentially my code is:
> connectionString=r"driver={SQL Server Native Client
> 10.0};server=...;uid=...;pwd=...;database=..."
> connection=odbc.odbc(connectionString)
> cursor=connection.cursor
> cursor.execute("select ...")
> cursor.fetchall()
> Could anyone suggest what the problem might be?
> Thanks,
> John
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