#!/usr/bin/env python
import netsnmp
import pyodbc

cnx = pyodbc.connect("DSN=srv;DATABASE=base;UID=user;PWD=123" )
cursor = cnx.cursor()
cursor.execute("SELECT [IP],[Community],[Name] FROM [Nodes]")

def snget(ip, Communily, oid=".1.3.6.1.2.1.1.1.0" ):
    session = netsnmp.Session( DestHost=ip, Version=2, Community=Communily)
    vars = netsnmp.VarList( netsnmp.Varbind(oid) )
    return session.get(vars)

row = cursor.fetchone()
while row:
   IP = row[0]
   Community   = row[1]
   Name = row[2]
   model = snget(IP,Community)
   if model[0] == None : 
       row = cursor.fetchone()
       continue
   fw_ver = .1.3.6.1.2.1.16.19.2.0
   fw = snget(IP,Community,oid=fw_ver)
   print Name,IP,model[0],fw[0]
   row = cursor.fetchone()

freetds.conf
[global]
    tds version = 8.0
    port = 1433
    text size = 64512
    try server login = yes
    try domain login = no
    client charset = UTF-8
[srv]
    host = 172.25.2.1
    port = 1433
    tds version = 8.0


odbc.ini 
[srv]
    Description=Server
    Driver=FreeTDS
    Servername=srv