Method _do_query

poco/proxy.py:882–891

(self, multiple=True, refresh=False)

    refresh = invalidate

    def _do_query(self, multiple=True, refresh=False):
        if not self._evaluated or refresh:
            self._nodes = self.poco.agent.hierarchy.select(self.query, multiple)
            if not self._nodes or len(self._nodes) == 0:
                # 找不到节点时，将当前节点状态重置，强制下一次访问时重新查询一次节点信息
                self.invalidate()
                raise PocoNoSuchNodeException(self)
            self._evaluated = True
            self._query_multiple = multiple
        return self._nodes