.. :py:method::

        :param tuple queries: [(sql, vars), (sql, vars), ...]

        .. note::
            batch execute queries.
            only support `insert` and `update`, have more efficiency

def batch(self, queries):
        """.. :py:method::

        :param tuple queries: [(sql, vars), (sql, vars), ...]

        .. note::
            batch execute queries.
            only support `insert` and `update`, have more efficiency
        """
        with self.connection() as cur:
            for sql, vars in queries:

                if self.debug:
                    print(cur.mogrify(query, vars))
                cur.execute(sql, vars)