Override to return the connection to the pool rather than closing it.

def close(self):
        '''
        Override to return the connection to the pool rather than closing it.
        '''
        if self._wrapped_connection and self._pool:
            logger.debug("Returning connection %s to pool %s" % (self._wrapped_connection, self._pool))
            self._pool.putconn(self._wrapped_connection)
            self._wrapped_connection = None