def query(self, query):
        """
        @return: a list of dictionary
        """
        try:
            logging.debug('PyDb:\n%s\n' % query)
            self.execute(query)
        except PgSQL.DatabaseError, value:
            import pdb
            pdb.set_trace()
            self.connection.rollback ()
#            print str(query)
#            raise "ERROR EXECUTE CMD (%s) %s" % (str(query), value)
        else:
            try:
                return _transcode([dict(row) for row in self.cursor.fetchall()])
            except PgSQL.Error, e:
                import pdb
                pdb.set_trace()
                if str(e) == 'fetchall() Failed - cursor does not contain any rows.':
                    return []
                raise e