FreeTDS Development Group

["Lowden, James K" <LowdenJK AT bernstein.com>]

> From: lists-tds AT mymailfilter.net [mailto:lists-tds AT mymailfilter.net]
> Sent: July 17, 2003 5:32 PM
>
> > create procedure foo @bar char(1) = 'B' output
> >     as      select @bar='A' 
> >             return 0
> > 
> > Then try these three calls:
> > 
> >     execute foo
> >     execute foo @a
> >     execute foo @a output

> I haven't examined these yet

Hmmm.  The length byte grows, of course (5a, 88, 96), but the size of the
"prefix" is constant.  Pretty much, so is the content.  After the second FF
FF FF FF block, there's a slight variation:

1.  00 00 63 1a 00 00 00 09 04 00 01 32 1a 00 00
2.  00 00 63 48 00 00 00 09 04 00 01 32 48 00 00
3.  00 00 63 56 00 00 00 09 04 00 01 32 56 00 00
             ^^                         ^^ 

What I can tell you is that those bytes don't leap out as having intrinsic
TDS significance.  They don't represent a datatype that I know of.  They're
not in the server's systypes table, either.  

I don't think they're bitmapped values; they're too different:

$ perl -e'printf "   %b\n %b\n %b\n", 0x1a, 0x48, 0x56'
   11010
 1001000
 1010110

Maybe try initializing @a to a few different values, and try defining @a as
char(2) and/or varchar(1)?  That might offer a few more data points.  

--jkl
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