InfoQ Homepage ORM Content on InfoQ
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ORM Profiler Analyzes Data Access Performance
Solutions Design has released ORM Profiler, a tool meant to help improve data access layer performance. It tracks and logs ADO.NET calls so that developers can analyze their data access and discover potential problems.
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Hibernate Object Mapping for NoSQL Datastores
Emmanuel Bernard, the developer behind Hibernate Validator, Hibernate Search, among others, recently announced the birth of Hibernate OGM. The new framework's goal is to provide a common interface for NoSQL datastores using JPA constructs. InfoQ spoke to Bernard to find out more about the framework.
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Entity Framework 4.1 - Validation
Validation is an interesting feature introduced in Entity Framework 4.1. It enables to validate entities or their properties automatically before trying to save them to the database as well as “on demand” by using property annotations. There are also a lot of improvements made to Validation from CTP5 to RTW version of Entity Framework 4.1.
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Differing Opinions: DTOs vs Domain Objects
Since the introduction of NHibernate and WCF, .NET developers have been moving closer and closer to the concept of unified entity-models. The end game here is that the same class can be act as your ORM entity, your WCF DTO, and your model for a MVC, MVP, or MVVM framework. Mark Seemann, author of Dependency Injection in .NET, argues this isn’t necessarily a good thing.
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Introducing the Entity Framework Power Tools
The introduction of a Code First option in Entity Framework has received quite a bit of praise. While it still has a long way to go before it unseats the reigning ORM, nHibernate, the progress Microsoft is making is quite astounding. In order to keep the momentum up Microsoft is releasing a set of power tools that will take an existing database and create a Code First representation.
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StackOverflow’s ORM goes Open Source - Dapper.Net
A simple ORM used in StackOverflow titled Dapper.Net was recently released on code.google.com. This ORM specializes in fast generation of objects from SQL query results. Dapper.Net supports mapping query results to a strongly typed list or a list of dynamic objects. The ORM is a single file of less than 500 lines of C# code and is available under the Apache 2.0 License.
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Entity Framework 4.1 gets DbContext API – but no Database Evolution, SPs or Cached queries
ADO.NET Entity Framework 4.1 is upon us – slated for a late April release, it will come with a whole set of new features, but not all of them are going to make it.
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The Latest NHibernate Developments
The latest NHibernate developments include: the release of NHibernate 3.0.0 Alpha 1, NHibernate Profiler supporting NHibernate 3.0, and HQL Language Service for Visual Studio.
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DataMapper Reaches 1.0 Milestone
DataMapper, an Object Relational Mapper (ORM) for Ruby, arrived at a milestone recently reaching 1.0 status. The release, announced during RailsConf 2010, and coinciding with Dirkjan Bussink's presentation at the conference on the subject.
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Debate: Comparing NHibernate and EF 4
Recently, a post by Oren Eini (a.k.a. Ayende Raheim) touched off a debate around the respective merits and capabilities of NHibernate and Entity Framework 4.0, two .NET-based Object/Relational Maping frameworks. InfoQ explored this debate in more detail to understand some of the perspectives which were given.
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ORM Profiling Tools for the .NET Platform
Sadly the terms “ORM” and “performance problems” often travel together. By hiding the underlying SQL from the developers, ORMs can offer a huge productivity boost. Unfortunately they also make it easy to generate ridiculously bad queries without realizing it. And without stored procedures to cross reference, finding the offending code without an ORM-specific profiler can be quite tricky.
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ADO.NET Entity Framework Providers for Oracle
Microsoft’s vision for .NET is a wide one. In addition to support for all programming languages, MS wants to bring together all communication frameworks and data storage engines. While WCF is making headway for standardizing communication APIs, their universal data access model Entity Framework is lagging behind. Much is this is due to lack of direct vendor support from companies like Oracle.
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Fluent NHibernate Has Been Released as 1.0 RC
James Gregory, the owner of the Fluent NHibernate project, has announced his project has reached the 1.0 milestone and it is currently a Release Candidate.
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NHibernate LINQ Provider Released
NHibernate Linq 1.0 has been released. Based on the stable provider from NHibernate Contrib, NHibernate Linq 1.0 is a LINQ provider that supports most operations available through the NHibernate criteria query API.
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Entity Framework CTP for VS 2010
Not everything planned for Visual Studio 2010 made it in beta 1. This includes some important features for ORM fans. Entity Framework CTP 1 includes support for Self Tracking Entities, POCO Templates, and support for EDMX-free coding.