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Persistence Software was an American software company that operated from 1991 to 2004. Persistence developed software for Object-relational mapping. The company was founded in 1991 by Derek Henninger, Christopher Keene and Richard Jensen in San Mateo, California, working with Stanford Professors Gio Wiederhold and (Arthur M Keller ), who was the Chief Technical Advisor. In 1999, Persistence Software went public on NASDAQ under the ticker symbol PRSW. In 2004, Progress Software bought Persistence for $16 million. Progress Software.〔(【引用サイトリンク】 url=http://www.progress.com/en/inthenews/progress-software-co-9272004.html )〕〔(【引用サイトリンク】 url=http://www.informationweek.com/progress-software-to-buy-persistence/47903124 )〕 ==History== Persistence Software started life as a spinoff from Lighthouse Design. As the original NeXTSTEP computer shipped with a relational database and objective-c, Lighthouse engineers had created a simple mapping utility called Exploder to store objects in a relational database. The Persistence team worked with Stanford Professor to extend the object-relational mapping technology by adding the concepts of mapping related objects. Persistence created a series of products that integrated object-to-relational mapping, caching, and cache synchronization with automated cache management. 〔 〕 〔 〕 The products were marketed under the names PowerTier, EdgExtend, and DirectAlert. 〔(【引用サイトリンク】 url=http://www.thefreelibrary.com/Persistence+Software+and+Sun+Microsystems,+Inc.+Sign+Technology...-a020772349 )〕 Sun Microsystems licensed the Persistence technology in 1998 which was later incorporated into the Enterprise JavaBeans standard. 〔(【引用サイトリンク】 url=http://www.thefreelibrary.com/Persistence+Software+and+Sun+Microsystems,+Inc.+Sign+Technology...-a020772349 )〕 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「Persistence Software」の詳細全文を読む スポンサード リンク
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