FreeTDS Development Group

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

Vadym,

I'm not sure I understand...do you want to build a perl DBD plugin ?
If so, there's no need...just look at the UG to see how to use existing
DBD::Sybase plugin with freetds to access both sybase and SQl Server.

Bill

-----Original Message-----
From: freetds-bounces AT lists.ibiblio.org
[mailto:freetds-bounces AT lists.ibiblio.org] On Behalf Of Vadym Kononenko
Sent: 18 August 2005 13:30
To: FreeTDS Development Group
Subject: Re: [freetds] libdbi - freetds driver


On Thursday 18 August 2005 14:44, Thompson, Bill D (London) wrote:

Hi, Bill!

> If at all possible, I would build your libdbi api on top of one of the
> existing api's - dblib ctlib or odbc. 
I can imagine the way to make FreeTDS dbd driver for DBI 
using ctlib or dblib, but it's incorrect to do the driver using odbc
anyway, 
because DBI architecture is too similar to ODBC.
So may be You right, but I'm not sure which one of dblib or ctlib is
better to 
use for my task? Can You (or anyone else) help me?

> The tds layer is really intended to be internal to freetds itself.
But I think it could be better to use the tds layer for my task.
Because DBD is a database-dependend layer of the DBI architecture, 
I hope You know about. So DBD should be a link between DBI calls and 
database-dependend CLI libraries (libtds?).
[userApp] <-> [libDBI] <-> [DBD-FreeTDS shared object (driver)] <-> 
[libtds] <=TDS=> [MSSQL/Sybase DBMS]
Any corrections of my vision are welcome!

> Very often, we find it necessary to alter the specification and/or
> behaviour of the libtds functions. You will, therefore, be making a
future
> problem for yourself by basing your code on libtds.
Agree,  I just don't know about often spec changes.

> On top of that, the dblib, ctlib and odbc api's are well documented
> publicly, providing you with a good description of expected behaviours
on
> which to base your libdbi code. We maintain the documented behaviour
of
> these API's under all circumstances.
Will keep in mind.

-- 
Best regards.
Vadym Kononenko.
Kyiv, Ukraine
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