FreeTDS Development Group

["Thompson, Bill D (London)" <bill_d_thompson AT ml.com>]

All,

I'm having a good look at our handling of AC (RETURNVALUE) packets.
I'm pretty sure now that MS's version of this packet is different from
Sybase's, and as yet it doesn't appear to make much sense.
I'll keep you posted.

Bill

-----Original Message-----
From: freetds-bounces AT lists.ibiblio.org
[mailto:freetds-bounces AT lists.ibiblio.org] On Behalf Of Thompson, Bill D
(London)
Sent: 07 January 2005 10:21
To: FreeTDS Development Group
Subject: RE: [freetds] RE: output parameters and "unknown marker"


Hi Alan,

I've recently noticed how well jTDS is doing - congratulations on API
cursors!

I'd noticed the length thing too - there seem to be issues with the SQL
server AC (RETURNVALUE) packet.

I've just run a test on a RPC call to Sybase and SQL server where the
RPC returns a NULL in an INT OUTPUT param.

Here's the two AC (RETURNVALUE) Packets...

Sybase:

token packet  name    name                                     max
actual
      length  length  @nrows)        status  user type   type  length
length

ac    000f    06      406e726f7773   01      00000000    26    04
00


Notice several things about this:

1) the packet length is correct
2) the data type is SYBINTN (showing it is a variable length datatype)

SQL Server

token packet  name    name

      length  length  @nrows)                  status  user type   type
??

ac    1300    06      40006e0072006f0077007300 01      38000000    38
00

Notice several things about this:

1) packet length seems to make no sense
2) user type and type are both SYBINT4 (fixed length datatype)
3) The following 00 could be a single byte "length of data" or a NULL
Indicator.
   but how are we supposed to know , given that we expect fixed length
data to follow.

Have you fixed this in jTDS ?

Bill





-----Original Message-----
From: freetds-bounces AT lists.ibiblio.org
[mailto:freetds-bounces AT lists.ibiblio.org] On Behalf Of Alin Sinpalean
Sent: 07 January 2005 10:02
To: freetds AT lists.ibiblio.org
Subject: [freetds] RE: output parameters and "unknown marker"


Has anyone else noticed that the packet length is incorrect? According 
to the header it's supposed to be 17 bytes but it's 18. This makes me 
think it's an SQL Server problem.

Alin Sinpalean,
The jTDS Project.
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