擅长:python、mysql、java
<p>我终于成功了!我使用<code>query.fetch_page</code>成批获取查询,然后迭代每个批并应用更改。在</p>
<pre><code>>>> more = True
>>> cursor = None
>>> while more:
... batch, cursor, more = MyModel.query().fetch_page(50, start_cursor=cursor)
... for entity in batch:
... if not len(entity.references):
... entity.references = somevalue
... entity.put()
... print "finished batch"
</code></pre>