Changing default TDS version & TDS version handling

7.1 should work for most things
7.2 is incomplete and some of the more significant features in 7.2
    are supported in 7.1
8.0 is really 7.1

http://www.freetds.org/userguide/choosingtdsprotocol.htm
http://lists.ibiblio.org/pipermail/freetds/2011q3/027303.html

_mssql.pyx

@@ -430,7 +430,7 @@ cdef class MSSQLConnection:
         self.column_types = None
 
     def __init__(self, server="localhost", user="sa", password="",
-            charset='', database='', appname=None, port='1433', tds_version='8.0'):
+            charset='', database='', appname=None, port='1433', tds_version='7.1'):
         log("_mssql.MSSQLConnection.__init__()")
 
         cdef LOGINREC *login
@@ -1430,6 +1430,10 @@ cdef int _tds_ver_str_to_constant(bytes verstr) except -1:
         return DBVERSION_42
     if verstr == u'7.0':
         return DBVERSION_70
+    if verstr == u'7.1':
+        return DBVERSION_71
+    if verstr == u'7.2':
+        return DBVERSION_72
     if verstr == u'8.0':
         return DBVERSION_80
     raise MSSQLException('unrecognized tds version: %s' % verstr)

sqlfront.pxd

@@ -97,6 +97,8 @@ cdef extern from "sqlfront.h":
     ## Version Constants ##
     int DBVERSION_42
     int DBVERSION_70
+    int DBVERSION_71
+    int DBVERSION_72
     int DBVERSION_80
 
     ## Type Constants ##

tests/test_config.py

@@ -63,6 +63,11 @@ def test_tds_protocal_version_70(self):
         assert 'major_version = 7' in config_dump
         assert 'minor_version = 0' in config_dump
 
+    def test_tds_protocal_version_71(self):
+        config_dump = self.connect(tds_version='7.1')
+        assert 'major_version = 7' in config_dump
+        assert 'minor_version = 1' in config_dump
+
     def test_tds_protocal_version_80(self):
         # follow-up: turns out 8.0 was erroneous.  MS named the new protocal
         # 7.1 instead of 8.0, so FreeTDS will accept 8.0 but shows as 7.1.