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freetds - RE: [freetds] TDS_DONE_TOKEN (and others)

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  • From: "Lowden, James K" <LowdenJK AT bernstein.com>
  • To: "'FreeTDS Development Group'" <freetds AT lists.ibiblio.org>
  • Subject: RE: [freetds] TDS_DONE_TOKEN (and others)
  • Date: Thu, 1 May 2003 10:08:20 -0400

> 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
K&R.

> > With TDS_DYNAMIC, you send the statement text, then *ask*
> the server to
> > describe the i/o parameters (i.e. types). To execute, you
> send TDS_DYNAMIC
> > 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
UG[1]:

<quote>
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.
</quote>

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
paramaters.

Regards,

--jkl

[1]
http://sybooks.sybase.com/onlinebooks/group-as/asg1250e/sqlug/@Generic__Book
View and
http://sybooks.sybase.com/onlinebooks/group-as/asg1250e/sqlug/@Generic__Book
TextView/42965;pt=42726


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