InfoQ Homepage Data Access Content on InfoQ
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Versioning JPA Entities
Maintaining a historical view of database records has been a problem that has been solved before but not easily. Being able to restore entities to their previous versions including basic properties as well as their relationships is more than a trivial task. Recently Envers 1.0.0 GA was released, aiming to simplify JPA entity revisioning.
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New Open Source project provides Object Oriented data access
Kasper Sørensen has created a new open source project at eobjects.dk called MetaModel. The project is a common domain model, query engine, and optimizer for different types of datastores, such as relational databases and flat files. MetaModel is a Java library that provides a fluent, object-oriented interface for SQL compliant queries.
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Beyond Polling? Consider PubSub, Push and MOM
You would expect a presentation entitled "Beyond REST? Building Data Services with XMPP PubSub" would have REST proponents up in arms. Instead, discussion was around the pros and cons of various PubSub alternatives.
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Should LINQ to SQL Go Open Source
More and more, LINQ to SQL is being seen as a temporary solution. With the impending release of ADO.NET Entity Framework, a lot of people are worried that development on LINQ to SQL will fall by the wayside. With Microsoft's long history of developing and discarding database access technologies, these concerns are not without merit. So this raises the question, "Should LINQ to SQL Go Open Source?"
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Databases Roundup: Data Sharding for ActiveRecord and Faster Postgres IO
In this databases roundup we take a look at DataFabric, FiveRun's recently open sourced data sharding plug-in for ActiveRecord. Also: a look at speeding up Postgres data access using the asynchronous client API and Ruby 1.9's Fibers.
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Eclipselink 1.0 released
EclipseLink last week released version 1.0. First announced at EclipseCon 2007, it was chosen by Sun as the reference implementation for JPA 2.0 at EclipseCon 2008.
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Merge, Replace, or Patch: How Astoria Handles Changing Data
Using REST, what should happen when you perform a PUT operation to update existing data? The Astoria Team asks that question and explains their answer.
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RAM is the new disk...
Jim Gray, a man who has contributed greatly to technology over the past 40 years, is credited with saying that memory is the new disk and disk is the new tape. With the proliferation of "real-time" web applications and systems that require massive scalability, how are hardware and software relating to this meme?
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Distributed Caching with JBoss Cache: Q&A with Manik Surtani
JBoss Cache is an enterprise-grade clustering solutions for Java-based applications, that aims to provide high availability and dramatically improve performance by caching frequently accessed Java objects. In this post InfoQ has a round-up interview with project lead Manik Surtani.
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Perst Embedded Database Releases Version 3.0
McObject® has released Perst™ version 3.0, a major upgrade of its open source, object-oriented embedded database system. Persist is dual licensed (commerical and GPL), allowing it to be used freely in non-commercial applications.
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Article: An Introduction to BlazeDS
Client/server communication is a key part of today's RIA architectures. In this article James Ward and Shashank Tiwari dive into Adobe's open source BlazeDS messaging server. The article describes the benefits of the AMF data format and how to use BlazeDS with a Java based server side application.
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Perst 3.0 Embedded Database Released
McObject has released version 3.0 of its open source embedded database targeted at Java and .NET developers.
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Presentation: Painless Persistence with Castle ActiveRecord
This presentation by Hamilton Verissimo and Oren Eini show Castle Active Record - an ORM solution for .NET building on NHibernate. After an introduction, the presentation dives into various advanced topics and techniques for working with Castle Active Record.
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Cloud Tools bring Java EE on Amazon EC2
Chris Richardson the author of "POJOs in Action", has released Cloud Tools, a set of tools for deploying and testing Java EE applications on Amazon's Elastic Computing Cloud (EC2). It's a Groovy framework that provides an API for launching EC2 instances; configuring MySQL, Tomcat servers; and deploying more web applications. In addition, it can also run JMeter and collect performance metrics.
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What Social Networks Are Teaching Us About Data Portability
As more social networking sites are popping up, the questions around the data they keep are rising. Data portability has become the watch phrase across the Web 2.0 world. Is there something to be learned about data access and portability from these services?