Finish addition of TDS protver 7.3 ID support.

ChangeLog

@@ -21,8 +21,7 @@ General
   * A ``freetds.conf`` file (see FreeTDS documentation)
 
 - Drop support for versions of FreeTDS older than 0.91.
-- Add support for reporting TDS version 7.3 is in use via the ``tds_version``
-  property of a ``_mssql``-level connection.
+- Accept 7.3 as TDS protocol version when establishing a connection.
 
 Features
 --------

docs/ref/_mssql.rst

@@ -134,6 +134,12 @@ Functions
       to set the TDS protocol version to ask for when connecting to the server
       but version 7.1 was used if not specified.
 
+    .. warning::
+      FreeTDS added sopport for TDS protocol version 7.3 in version 0.95. You
+      need to be careful of not asking for TDS 7.3 if you know the undelying
+      FreeTDS used by pymssql is version 0.91 as it won't raise any error nor
+      keep you from passing such an invalid value.
+
 ``MSSQLConnection`` object properties
 -------------------------------------
 

docs/ref/pymssql.rst

@@ -116,6 +116,12 @@ Functions
      version, and in version 2.1.2 it was possible to set it but version 7.1 was
      used if not specified.
 
+   .. warning::
+     FreeTDS added sopport for TDS protocol version 7.3 in version 0.95. You
+     need to be careful of not asking for TDS 7.3 if you know the undelying
+     FreeTDS used by pymssql is version 0.91 as it won't raise any error nor
+     keep you from passing such an invalid value.
+
 .. function:: get_dbversion()
 
     TBD

src/_mssql.pyx

@@ -31,6 +31,9 @@ DEF MSSQLDB_MSGSIZE = 1024
 DEF PYMSSQL_MSGSIZE = (MSSQLDB_MSGSIZE * 8)
 DEF EXCOMM = 9
 
+# Provide constant missing from FreeTDS 0.91 so that we can build against it
+DEF DBVERSION_73 = 7
+
 ROW_FORMAT_TUPLE = 1
 ROW_FORMAT_DICT = 2
 
@@ -1722,6 +1725,8 @@ cdef int _tds_ver_str_to_constant(verstr) except -1:
         return DBVERSION_71
     if verstr == u'7.2':
         return DBVERSION_72
+    if verstr == u'7.3':
+        return DBVERSION_73
     raise MSSQLException('unrecognized tds version: %s' % verstr)
 
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