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The Datastore Java API - Google App Engine - Google Code
The Datastore Java API
The App Engine datastore is a schemaless object datastore, with a query engine and atomic transactions. The Java SDK includes implementations of the Java Data Objects (JDO) and Java Persistence API (JPA) interfaces, as well as a low-level datastore API.
This reference describes the Java interfaces for the App Engine datastore, with an emphasis on JDO. It has the following sections:
