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Object-Relational Mapping (ORM) is a programming system in which a metadata descriptor is utilized to unite item code to a relational database. Article code is composed in item arranged programming (OOP) languages, for example, Java or C++. ORM changes over information between sort frameworks that are not able to exist together inside social databases and OOP languages.

Doctrine is an object relational mapper (ORM) for PHP 5.2.3+ that sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernates HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.

Cassandra is a distributed object-oriented database (no ORM needed) originally created by Facebook and used by lots of high-traffic websites. They use Thrift and have code samples here in Java, C#, Python, and PHP ... hot stuff.

A light-weight, dynamic data access component for C# 4.0

A 5 part blogpost about the performance of a select statement done with ADO.Net using inline sql, and stored procedures (even some dynamic sql) and then nHibernate to get the same results. But this one has an alternate ending.

A code-generation tool to work around one of the main limitations of Microsoft's Entity Framework V1 (released as part of .NET Framework 3.5 SP1 and Visual Studio 2008 SP1): lack of support for POCO (Plain Old CLR Object) entity objects -- that is, objects that do not have any persistence awareness programmed in them.

AutoMapper uses a fluent configuration API to define an object-object mapping strategy. AutoMapper uses a convention-based matching algorithm to match up source to destination values. It flattens as it maps to make it easy to use for converting your Model into a ViewModule or Data Transfer Object (DTO)..