Making 'OR' Queries in Google App Engine Data Model

I want to make a query like this "Select name from Person where Address开发者_如何转开发="" OR age="" ". Is that possible in the GAE model. All things include AND closure and not OR. How can i do that with JDO/JPA, Objectify. Thanks in advance

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There is no "OR" operation on the datastore. You must do two separate queries and find the intersection in your own code.

http://code.google.com/appengine/docs/python/datastore/gqlreference.html

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I recommend Anyone who is having difficulties with GAE datastore model to have a look at this video. It explains how it works, then you will understand why the limitations exists

http://sites.google.com/site/io/under-the-covers-of-the-google-app-engine-datastore