[freetds] TDS_DONE_TOKEN (and others)

Lowden, James K LowdenJK at bernstein.com
Thu May 1 10:08:20 EDT 2003

> From: Frediano Ziglio [mailto:freddyz77 at tin.it]
> Sent: May 1, 2003 3:30 AM
> you can use syntax like enum my_enum var:16;

Hmm, I've never seen that before.  I can't find any description of it in

> > With TDS_DYNAMIC, you send the statement text, then *ask* 
> the server to
> > describe the i/o parameters (i.e. types).   To execute, you 
> > again ('type' TDS_DYN_EXEC (0x02)), followed by a bunch of parameter
> > packets.  Paramater names are not supported.  
> I know, but there are problem with image/text field...

That's a limitation of stored procedures, too.  I think dynamic SQL
basically creates a stored procedure on the server.  From Sybase's T-SQL

Parameters must be given a system datatype (except text or image) or a
user-defined datatype, and (if required for the datatype) a length or
precision and scale in parentheses.

The other thing you tried was to send TDS_PARAMFMT packets to the server,
trying to describe the parameter.  It doesn't work that way.  The server
sends them to you in response to TDS_DYN_PREPARE.  I assume you knew that,
and were just trying *anything* to see if you could create image-type



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