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db4o (database for objects) is an embeddable open source object database for Java and .NET developers. It is developed, commercially licensed and supported by Actian. In October 2014, Actian declined to continue to actively pursue and promote the commercial db4o product offering for new customers. db4o is written in Java and .NET and provides the respective APIs. It can run on any operating system that supports Java or .NET. It is offered under licenses including the GNU General Public License (GPL), the (db4o Opensource Compatibility License (dOCL) ), and a commercial license for use in proprietary software. == History == The term Object-oriented Database System dates back to around 1985, though the first research developments in this area started during the mid-1970s. The first commercial object database management systems were created in the early 1990s; these added the concept of native database driven persistence into the field of object-oriented development. The second wave of growth was observed in the first decade of the 21st century, when Object-Oriented Databases written completely in an Object-Oriented language appeared on the market. db4o is one of the examples of such systems written completely in Java and C#. The db4o project was started in 2000 by Chief Architect Carl Rosenberger, shipping in 2001. 100 commercial pilot customers and community users have supported db4o from its earliest days and it has been used in enterprise and academic applications prior to its commercial launch in 2004 by newly created private company Db4objects Inc. In 2008 the db4o OODBMS was purchased by Versant corporation, who are as of 2014 the current owners and developers of db4o. It is marketed an open-source bi-licensed software (commercial and GPL). Since the initial launch db4o has gone through changes and improvements (see #Versions) leading up to the release of version 8 in the latter half of 2011. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Db4o」の詳細全文を読む スポンサード リンク
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