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

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

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