Category Archives: JDO

DataNucleus AccessPlatform v3.1 coming soon …

Almost a year from the release of version 3.0 and we move close to the release of version 3.1 (due late in July 2012). So what has changed in that time ? Consolidation While DataNucleus’ plugin architecture is very flexible, … Continue reading

Posted in AccessPlatform, GAE, JDO, JPA | Leave a comment

GAE/J and DataNucleus v3 – Part 2

In the previous post we saw some initial changes to make GAE/J DataNucleus plugin work with the latest version of DataNucleus plugins. In this post we describe some further features of interest to GAE users that they weren’t able to … Continue reading

Posted in AppEngine, GAE, JDO, JPA, Uncategorized | Leave a comment

GAE/J and DataNucleus v3 – Part 1

Some time ago I wrote a post about GAE/J and how it provides JDO/JPA. It had many limitations and shortcomings. Recently we have had the chance to update their DataNucleus plugin to work with version 3.0. Here are the major … Continue reading

Posted in AppEngine, JDO, JPA | 3 Comments

Performance, benchmarking

Every so often some individual or group decides they’re going to “invent” a new benchmark. They ignore all that have been done before (like PolePos) maybe due to NotInventedHereSyndrome, or maybe due to “oh someone who helped write that was … Continue reading

Posted in JDO, JPA, Persistence | 3 Comments

DataNucleus v3 and MongoDB

There has obviously been a recent shift to look at highly scalable datastores for use in “the cloud”. Google wrote a plugin for their own BigTable datastore back in 2009, providing access to some of the features of JDO/JPA. Unfortunately … Continue reading

Posted in JDO, JPA, MongoDB, NoSQL | Leave a comment

DataNucleus v3 and HBase

DataNucleus AccessPlatform v3 provides an opportunity to bring some of our other datastore plugins closer to the standard of the more mature long-supported datastores (e.g RDBMS). In the case of HBase, the plugin provided with v2.0 offered basic persistence and … Continue reading

Posted in hbase, JDO, JPA, NoSQL | 3 Comments

JDO Typesafe .vs. JPA Criteria

JPA2 introduced its “Criteria” queries, providing an API for typesafe query generation without the need to hardcode field names etc in queries; it built on the approach of Hibernate Criteria. DataNucleus includes a proposal for JDO “Typesafe” queries. It takes … Continue reading

Posted in Criteria, JDO, JDOQL, JPA, LINQ, Typesafe | 9 Comments