add support for BigInteger / bigint

Author: elver

django_pyodbc/creation.py

@@ -36,6 +36,7 @@ class DatabaseCreation(BaseDatabaseCreation):
         'FilePathField':     'nvarchar(%(max_length)s)',
         'FloatField':        'double precision',
         'IntegerField':      'int',
+        'BigIntegerField':   'bigint',
         'IPAddressField':    'nvarchar(15)',
         'NullBooleanField':  'bit',
         'OneToOneField':     'int',

django_pyodbc/introspection.py

@@ -7,7 +7,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
     # Map type codes to Django Field types.
     data_types_reverse = {
         SQL_AUTOFIELD:                  'AutoField',
-        Database.SQL_BIGINT:            'IntegerField',
+        Database.SQL_BIGINT:            'BigIntegerField',
         #Database.SQL_BINARY:            ,
         Database.SQL_BIT:               'BooleanField',
         Database.SQL_CHAR:              'CharField',