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Demos of various uses of the Java Mapper API
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Demonstrates a bunch of useful Mappers for use with the App Engine Mapreduce library The Mapper library can be found here: http://code.google.com/p/appengine-mapreduce This project includes sample code for using the Java version of this library. Code samples include: - Changing all Strings to lowercase across all Entities - Changing all Strings to lowercase across all Entities using a mutation pool (more efficient) - Deleting all Entities of a given Kind - Counting all the words across all Entities, then using a callback URL to save them - Taking an input in the Mapper interface - Importing data from a CSV file into the datastore The introductory blog post to the Mapper API can be found here: http://ikaisays.com/2010/07/09/using-the-java-mapper-framework-for-app-engine/ A follow up post about reading input from the Blobstore can be found here: http://ikaisays.com/2010/07/09/using-the-java-mapper-framework-for-app-engine/