[freetds] FreeTDS and MSSQL

James K. Lowden jklowden at freetds.org
Sun Apr 20 14:37:14 EDT 2008


Venkat Lak wrote:
>   I use FreeTDS 0.63 to access a MSSQL server 2000 (version 
>   8.00.2039). It connects fine and my queries work except for
>   one - when I use a GUID string (a varchar column) in the
>   where clause it fails:
>    
>   select * from table where
>   tid='bb8c5fe8-5e25-4181-8c3f-9ed12b6f9eb7-ed';
>    
>   However, when I do:
>    
>   select * from table where
>   tid>='bb8c5fe8-5e25-4181-8c3f-9ed12b6f9eb7-ed';
>    
>   it works ! It also works for '>','<','<=' and '<>' comparison
>   operators - just that '=' fails. In the tds dump I get:
>    
>   dblib.c:4297:dbsqlok(010B7BC0)
> net.c:363:error: select(2) returned 0x2726, "Unknown error"
> util.c:328:tdserror(010B7A08, 010B8340, 20004, 10022)
> dblib.c:7583:dbperror(010B7BC0, 20004, 0)

Um, no.  tdserror() was introduced in January 2007, long after 0.63 was
released.  

FreeTDS doesn't interpret SQL.  The server is rejecting it, and it's very
likely that it returns a message before it closes the connection.  Look
for an error token in the TDSDUMP log:

$ grep marker dump | grep ERROR
token.c:525:processing result tokens.  marker is  aa(ERROR)
token.c:105:tds_process_default_tokens() marker is aa(ERROR)

The message text will be nearby.  

HTH.  

--jkl



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