[freetds] Instance_name with dblib

Lowden, James K LowdenJK at bernstein.com
Fri Feb 17 09:55:01 EST 2006


> From: FlavianoMa
> Sent: Friday, February 17, 2006 3:26 AM
> 
> I need to use dblib with multiple MSSql instance on the same server.
> I don't like to use the port number.  The only way to use an
> "Instance name" with dblid is writing on FREETDS.CONF.
> 
> Is there another option? LOGINREC?

Unfortunately, no.  The only place to put named instance information is
in freetds.conf.  

However, you put a good idea in my head.  A little googolocity turned up
these:

http://support.microsoft.com/kb/265808/en-us
http://support.microsoft.com/kb/260418/en-us (see #6)

I think the next release should support named instances in, er, the
name.  Just because Microsoft wants you to use MDAC 2.6 doesn't mean we
can't enhance db-lib.  

I propose a named instance have the form:

	[\\]computername\instancename

e.g.	dbopen(login, "servername\instance");

(where the leading backslashes are optional), similar to the form:

	domain\username

for domain logins.  

If we put this in src/tds/login.c, it should work for all libraries.  

Done correctly, users would never have to specify a port (or even a
server!) for a normal TDS 7.0+ connection.  The logic would be:

1.  Use instance if specified in connection string, else
2.  Use instance/port if provided in freetds.conf, else
3.  Use port 1433.

--jkl

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