Override _cursor to plug in our connection pool code.  We'll return a wrapped Connection
        which can handle returning itself to the pool when its .close() method is called.

def _cursor(self):
        '''
        Override _cursor to plug in our connection pool code.  We'll return a wrapped Connection
        which can handle returning itself to the pool when its .close() method is called.
        '''
        from django.db.backends.postgresql.version import get_version

        new_connection = False
        set_tz = False
        settings_dict = self.settings_dict

        if self.connection is None or connection_pools[self.alias]['settings'] != settings_dict:
            new_connection = True
            set_tz = settings_dict.get('TIME_ZONE')

            # Is this the initial use of the global connection_pools dictionary for 
            # this python interpreter? Build a ThreadedConnectionPool instance and 
            # add it to the dictionary if so.
            if self.alias not in connection_pools or connection_pools[self.alias]['settings'] != settings_dict:
                if settings_dict['NAME'] == '':
                    from django.core.exceptions import ImproperlyConfigured
                    raise ImproperlyConfigured("You need to specify NAME in your Django settings file.")
                conn_params = {
                    'database': settings_dict['NAME'],
                }
                conn_params.update(settings_dict['OPTIONS'])
                for extra in ['autocommit'] + pool_config_defaults.keys():
                    if extra in conn_params:
                        del conn_params[extra]
                if settings_dict['USER']:
                    conn_params['user'] = settings_dict['USER']
                if settings_dict['PASSWORD']:
                    conn_params['password'] = settings_dict['PASSWORD']
                if settings_dict['HOST']:
                    conn_params['host'] = settings_dict['HOST']
                if settings_dict['PORT']:
                    conn_params['port'] = settings_dict['PORT']

                self.create_connection_pool(conn_params)

            self.connection = PooledConnection(connection_pools[self.alias]['pool'], 
                                               test_query=self._test_on_borrow_query)
            self.connection.set_client_encoding('UTF8')
            self.connection.set_isolation_level(self.isolation_level)
            # We'll continue to emulate the old signal frequency in case any code depends upon it
            connection_created.send(sender=self.__class__, connection=self)
        cursor = self.connection.cursor()
        cursor.tzinfo_factory = None
        if new_connection:
            if set_tz:
                cursor.execute("SET TIME ZONE %s", [settings_dict['TIME_ZONE']])
            if not hasattr(self, '_version'):
                self.__class__._version = get_version(cursor)
            if self._version[0:2] < (8, 0):
                # No savepoint support for earlier version of PostgreSQL.
                self.features.uses_savepoints = False
            if self.features.uses_autocommit:
                if self._version[0:2] < (8, 2):
                    # FIXME: Needs extra code to do reliable model insert
                    # handling, so we forbid it for now.
                    from django.core.exceptions import ImproperlyConfigured
                    raise ImproperlyConfigured("You cannot use autocommit=True with PostgreSQL prior to 8.2 at the moment.")
                else:
                    # FIXME: Eventually we're enable this by default for
                    # versions that support it, but, right now, that's hard to
                    # do without breaking other things (#10509).
                    self.features.can_return_id_from_insert = True
        return CursorWrapper(cursor)