Object relational mapper (ORM) for PHP 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. The Doctrine ORM aims to provide transparent object persistence for idiomatic, object-oriented PHP. It is very similar in nature and API to the Java Persistence API with a lot of PHP-specific features aiming at more simplicity and practicability for the PHP environment.

Object relational mapper (ORM) for PHP 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.

Doctrine ORM - Object relational mapper for PHP

Propel is an open-source Object-Relational Mapping (ORM) for PHP5. It allows you to access your database using a set of objects, providing a simple API for storing and retrieving data. Propel uses PDO as an abstraction layer, and code generation to remove the burden of runtime introspection. Therefore Propel is fast. Propel implements all the key concepts of mature ORM layers: the ActiveRecord pattern, validators, behaviors, table inheritance, reverse engineering an existing database, nested sets, nested transactions, lazy loading, LOB, etc. Propel supports MySQL, PostgreSQL, SQLite, MSSQL, and Oracle.

Propel is an open-source Object-Relational Mapping (ORM) for PHP5. It allows you to access your database using a set of objects, providing a simple API for storing and retrieving data. Propel uses PDO as an abstraction layer, and code generation to remove the burden of runtime introspection. Therefore Propel is fast.

Propel - smart easy object persistance in PHP

The Marten library provides .NET developers with the ability to use the proven PostgreSQL database engine and its fantastic JSON support as a fully fledged document database. The Marten team believes that a document database has far reaching benefits for developer productivity over relational databases with or without an ORM tool.Marten also provides .NET developers with an ACID-compliant event store with user-defined projections against event streams.

Marten - Postgresql as a Document Database and Event Store for .Net Applications

Hibernate facilitated the storage and retrieval of domain objects via Object/Relational Mapping. Today, Hibernate is a collection of related projects enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping. Hibernate lets you develop persistent classes following natural Object-oriented idioms including inheritance, polymorphism, association, composition. It supports Oracle, DB2, MySQL, PostgreSQL, Sybase, Interbase, Microsoft SQL Server, Progress, SAP DB, and HypersonicSQL. It also provides support to do text search and Shard (horizontal partition) the database.
 <UL>
	<LI>Transparent Persistence</LI>
	<LI>High Performance</LI>
	<LI>Reliability and Scalability</LI>
	<LI>Extensibility: Hibernate is highly customizable and extensible. </LI>
	<LI>Support for Hibernate Query Language (HQL)</LI>
 </UL>

Hibernate facilitated the storage and retrieval of domain objects via Object/Relational Mapping.  Today, Hibernate is a collection of related projects enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping.

Hibernate - Relational Persistence for Java

NHibernate is a mature, open source object-relational mapper for the .NET framework. NHibernate is a port of Hibernate Core for Java to the .NET Framework. It handles persisting plain .NET objects to and from an underlying relational database. NHibernate supports transparent persistence, your object classes don't have to follow a restrictive programming model. Persistent classes do not need to implement any interface or inherit from a special base class. This makes it possible to design the business logic using plain .NET (CLR) objects and object-oriented idiom. Full Text Search. Cluster-scoped caching with Microsoft Velocity & Memcached. Business validation rules. ReSharper plugin. Castle Active Record. S#arp Architecture. And many more... 
 <UL><li>Natural programming model - NHibernate supports natural OO idiom; inheritance, polymorphism, composition and the .NET collections framework, including generic collections.</li></ul><ul style="text-align: justify;"><li>Native .NET - NHibernate API uses .NET conventions and idioms</li></ul><ul style="text-align: justify;"><li>Support for fine-grained object models - a rich variety of mappings for collections and dependent objects</li></ul><ul style="text-align: justify;"><li>No build-time bytecode enhancement - there's no extra code generation or bytecode processing steps in your build procedure</li></ul><ul style="text-align: justify;"><li>The query options - NHibernate addresses both sides of the problem; not only how to get objects into the database, but also how to get them out again</li></ul><ul style="text-align: justify;"><li>Custom SQL - specify the exact SQL that NHibernate should use to persist your objects. Stored procedures are supported on Microsoft SQL Server.</li></ul><ul style="text-align: justify;"><li>Support for "conversations" - NHibernate supports long-lived persistence contexts, detach/reattach of objects, and takes care of optimistic locking automatically</li></ul><ul style="text-align: justify;"></ul>

NHibernate is a mature, open source object-relational mapper for the .NET framework. NHibernate is a port of Hibernate Core for Java to the .NET Framework. It handles persisting plain .NET objects to and from an underlying relational database.

NHibernate - object-relational mapper for .NET

MongoDB object modeling designed to work in an asynchronous environment. It provides a straight-forward, schema-based solution to modeling your application data and includes built-in type casting, validation, query building, business logic hooks and more, out of the box.

Mongoose - Elegant MongoDB object modeling for Node.js

HyperSQL supports the widest range of SQL Standard features seen in any open source database engine. It offers a small, fast database engine which offers in-memory and disk-based tables and supports embedded and server modes. 
 Its major feature include: 
 <UL>
	<LI>Java stored procedures and functions</LI>
	<LI>Java triggers</LI>
	<LI>Extensive JDBC interface support </LI>
	<LI>Persistence</LI>
	<LI>Embedded (into Java applications) and Client-Server operating modes</LI>
	<LI>Multiple databases per JVM </LI>
	<LI>ODBC support</LI>
	<LI>simple GUI database management tools</LI>
 </UL>
 Commercial support is available.

HyperSQL supports the widest range of SQL Standard features seen in any open source database engine. It offers a small, fast database engine which offers in-memory and disk-based tables and supports embedded and server modes. It is a relational database engine written in Java, with a JDBC driver, conforming to ANSI SQL:2008. It alsi supports transaction isolation, multiversion concurrency and ACID, Java stored procedures, Scalability and lot more.

HyperSQL - Java Database

The Qcodo Development Framework is an open-source PHP web application framework which builds an Object Relational Model (ORM), CRUD (Create, Retrieve, Update, Delete) UI pages, and AJAX hooks from an existing data model. It additionally includes a tightly-integrated HTML and JavaScript form toolkit which interfaces directly with the generated entities. It is a robust, comprehensive framework which can be utilized by small and large Web applications alike. The framework consists of three main components: the Code Generator, QForms (OOP generated stateful Ajax- or server-processed webform), QQuery (OOP based SQL Query builder) -- all of which can be used independently of each other. The Code Generator parses an existing Relational Database structure, and builds an ORM, as well as several remote interfaces (SOAP, AJAX) to the ORM. The ORM in Qcodo can be extended to provide user-maintained functionality (via object subclassing). QForms is a ASP.NET-inspired templating engine in which each form element is an object exposing its functionality and state via methods and attributes. Delo.si, the official website of <A HREF="http://www.delo.si/" target="_blank">Delo</A>, the major daily newspaper of Slovenia.

The Qcodo Development Framework is an open-source PHP web application framework which builds an Object Relational Model (ORM), CRUD (Create, Retrieve, Update, Delete) UI pages, and AJAX hooks from an existing data model. It additionally includes a tightly-integrated HTML and JavaScript form toolkit which interfaces directly with the generated entities. It is a robust, comprehensive framework which can be utilized by small and large Web applications alike.

Qcodo - Code Less Do More

nHydrate is an object-relational mapping (ORM) solution for the Microsoft .NET platform providing a framework for a relational database to be mapped to .NET objects. It is designed to alleviate the software developers experience writing persistence domains. The model controls database generation, LINQ syntax, API, DAL, etc. The tool is entirely sited within Visual Studio.NET and all model maintenance and generation is handled directly from the environment. There are no XML files or other complex configuration scenarios to navigate like almost all other ORM tools. The VS.NET plugin GUI editor provides an interface to interact with a model and use it. Its features include: 
 <UL>
	<LI>Model Driven Architecture (MDA)</LI>
	<LI>Powerful code generation framework</LI>
	<LI>Visual Studio Integration</LI>
	<LI>Dependency Walking</LI>
	<LI>Persistence of 'dirty' (changed) data only</LI>
	<LI>Server-side paging</LI>
	<LI>In-memory filtering and sorting using LINQ</LI>
	<LI>Auditing Support</LI>
	<LI>Validation support</LI>
	<LI>Callbacks and Notifications</LI>
	<LI>Advanced lazy loading/load on demand</LI>
	<LI>Load objects with LINQ syntax</LI>
	<LI>Support for aggregate functionality</LI>
	<LI>Concurrency Control Mechanism</LI>
	<LI>Dynamic SQL Support</LI>
 </UL>

nHydrate is an object-relational mapping (ORM) solution for the Microsoft .NET platform providing a framework for a relational database to be mapped to .NET objects. It is designed to alleviate the software developers experience writing persistence domains. The model controls database generation, LINQ syntax, API, DAL, etc.

nHydrate - Conceive, Model, Generate

SubSonic is A Super High-fidelity Batman Utility Belt that works up your Data Access (using Linq in 3.0), throws in some much-needed utility functions, and generally speeds along your dev cycle. You can code your objects the way you like (with some minor convention tweaks) and the SimpleRepository will save them for you. It will also create your database on the fly if you want, altering the schema as you change your object. If you like having to do as little as possible with your data access, ActiveRecord makes this very, very simple. You don't need to create a lot of extra objects or know how the guts of anything work. It's as simple as asking for a new object and calling a Save() method.

SubSonic is A Super High-fidelity Batman Utility Belt that works up your Data Access (using Linq in 3.0), throws in some much-needed utility functions, and generally speeds along your dev cycle.

SubSonic - Data access for .NET

RedBeanPHP is an open source ORM (object relational mapping) tool for PHP. It focuses on simplicity and ease of use. What makes RedBean unique is that it creates your database schema on-the-fly. It scans your data and adjusts the column types to fit your object properties. If your models are stabilized you can freeze the database. This way RedBean is easy to develop with but is also extremely fast on production servers. RedBean requires zero configuration. No INI, YAML, XML or other config files. Just include the file in your code and you are done. RedBean works with beans. Beans are simple objects that only have public properties. The idea behind RedBean is simple, you fill the bean with the properties you need and then you give it to RedBean and it will be stored in the database. No matter what. RedBean creates tables, columns and column types on the fly. No need to switch back-and-forth to phpmyadmin anymore! Just write your code and RedBean takes care of the database. RedBeanPHP is compatible with the best open source databases around; MySQL, SQLite and PostgreSQL.

RedBeanPHP is an open source ORM (object relational mapping) tool for PHP. It focuses on simplicity and ease of use. What makes RedBean unique is that it creates your database schema on-the-fly. It scans your data and adjusts the column types to fit your object properties. If your models are stabilized you can freeze the database. This way RedBean is easy to develop with but is also extremely fast on production servers.

RedBeanPHP - Easiest ORM layer for php

Outlet differs from other orm solutions for php in that it provides transparent, unobtrusive persistence. It does not require your entity objects to implement any interfaces or extend some sort of base class. It is also very lightweight, only a handful of classes and tools. It uses an approach similar to hibernate in java, using proxy objects that save the data behind the scenes. This library is not about database abstraction (although it does provide some abstraction). It is about using objects to model domain concepts.

Outlet differs from other orm solutions for php in that it provides transparent, unobtrusive persistence. It does not require your entity objects to implement any interfaces or extend some sort of base class. It is also very lightweight, only a handful of classes and tools.

Outlet - object-to-relational mapping for PHP

Fluent, XML-less, compile safe, automated, convention-based mappings for NHibernate. Fluent NHibernate offers an alternative to NHibernate's standard XML mapping files. Rather than writing XML documents, you write mappings in strongly typed C# code. This allows for easy refactoring, improved readability and more concise code. Why replace HBM.XML? While the separation of code and XML is nice, it can lead to several undesirable situations.<ul><li> Due to XML not being evaluated by the compiler, you can rename properties in your classes that aren't updated in your mappings; in this situation, you wouldn't find out about the breakage until the mappings are parsed at runtime.
</li><li> XML is verbose; NHibernate has gradually reduced the mandatory XML elements, but you still can't escape the verbosity of XML.
</li><li> Repetitive mappings - NHibernate HBM mappings can become quite verbose if you find yourself specifying the same rules over again. For example if you need to ensure all <code>string</code> properties mustn't be nullable and should have a length of 1000, and all <code>int</code>s must have a default value of -1.
</li></ul>
How does Fluent NHibernate counter these issues? It does so by moving your mappings into actual code, so they're compiled along with the rest of your application; rename refactorings will alter your mappings just like they should, and the compiler will fail on any typos. As for the repetition, Fluent NHibernate has a conventional configuration system, where you can specify patterns for overriding naming conventions and many other things; you set how things should be named once, then Fluent NHibernate does the rest.
 Its feature includes:

 <ul>
	 <li> Auto mappings - where mappings are inferred from the design of your entities</li>
	 <li> Persistence specification testing - round-trip testing for your entities, without ever having to write a line of CRUD</li>
	 <li> Full application configuration with our Fluent configuration API</li>
	 <li> Database configuration - fluently configure your database in code</li>
 </ul>

Fluent, XML-less, compile safe, automated, convention-based mappings for NHibernate. Fluent NHibernate offers an alternative to NHibernate's standard XML mapping files. Rather than writing XML documents, you write mappings in strongly typed C# code. This allows for easy refactoring, improved readability and more concise code. 

Fluent NHibernate - Fluent mapping for model

Business Logic Toolkit is a set of components to simplify .NET application development. BLToolkit is provided as source code that you can use "as is" or customize for your applications. It is written in C# and compatible with .NET Framework 3.5 and 4.0. Source code location: <A HREF="http://code.google.com/p/bl-toolkit/" target="_blank">http://code.google.com/p/bl-toolkit/</A>

Business Logic Toolkit is a set of components to simplify .NET application development. BLToolkit is provided as source code that you can use "as is" or customize for your applications. It is written in C# and compatible with .NET Framework 3.5 and 4.0.

BL-Toolkit - Business Logic Toolkit for .NET

The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop MapReduce support.
 
Although there are various excellent ORM frameworks for relational databases, data modeling in NoSQL data stores differ profoundly from their relational cousins. Moreover, data-model agnostic frameworks such as JDO are not sufficient for use cases, where one needs to use the full power of the data models in column stores. Gora fills this gap by giving the user an easy-to-use in-memory data model and persistence for big data framework with data store specific mappings and built in Apache Hadoop support.

The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop MapReduce support.

Apache Gora - Provides persistence to column stores, key value stores, document stores and RDBMS

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