Objectify

This library simplifies working with the GAE data storage engine.

It provides a low-level API, exposing all of the datastore engine to novice and advanced developers.

Features:

• Persist, retrieve, delete, and query GAE typed objects
• Exposes the GAE datastore features via a low-level API
• Support for batch operations, queries, asynchronous operations, partial indexes and transactions.
• Type-safe.
• Human-friendly query interface
• Data caching system
• Support for polymorphic entities
• Provides a transaction model
• Can migrate schema changes
• No external dependencies
• Documentation
• Well tested code

What is new in this release:

• Always enables XG when starting a transaction on HRD
• Memcache integration now uses SDK 1.6.0 batch CAS operations for efficiency
• Added ObjectifyFactory.allocateIdRange()
• Changed Key<?>.toWebSafeString() (introduced in 3.1b1) to getString()
• Added a Key<?> constructor (and create() method) that takes a web safe string (ie getString())
• Added optional converters for joda time and money classes

Requirements:

• Google App Engine SDK for Java