jiubadao / objectify

The simplest convenient interface to the Google App Engine datastore

Objectify

Objectify is a Java data access API specifically designed for the Google App Engine datastore. It occupies a "middle ground"; easier to use and more transparent than JDO or JPA, but significantly more convenient than the Low-Level API. Objectify is designed to make novices immediately productive yet also expose the full power of the GAE datastore.

Features

• Objectify lets you persist, retrieve, delete, and query your own typed objects.

@Entity
class Car {
    @Id String vin; // Can be Long, long, or String
    String color;
}
  
ofy().save().entity(new Car("123123", "red")).now();
Car c = ofy().load().type(Car.class).id("123123").now();
ofy().delete().entity(c);

• Objectify surfaces all native datastore features, including batch operations, queries, transactions, asynchronous operations, and partial indexes.
• Objectify provides type-safe key and query classes using Java generics.
• Objectify provides a human-friendly query interface.
• Objectify can automatically cache your data in memcache for improved read performance.
• Objectify can store polymorphic entities and perform true polymorphic queries.
• Objectify provides a simple, easy-to-understand transaction model.
• Objectify provides built-in facilities to help migrate schema changes forward.
• Objectify provides thorough documentation of concepts as well as use cases.
• Objectify has an extensive test suite to prevent regressions.

Documentation

Full documentation is availble in the Objectify Wiki. Be sure to check out the FAQ, especially if you are using Flexible Runtimes.

Downloads

Objectify is released to the Maven Central Repository and can be downloaded directly from there.

Help

Help is provided in the Objectify App Engine User Group