def db_putString(self, db_name, key, value):
        """https://github.com/ethereum/wiki/wiki/JSON-RPC#db_putstring

        DEPRECATED
        """
        warnings.warn('deprecated', DeprecationWarning)
        return (yield from self.rpc_call('db_putString',
                                         [db_name, key, value]))
https://github.com/ethereum/wiki/wiki/JSON-RPC#db_putstring

        DEPRECATED