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DataEase
DataEase is a relational database management system (RDBMS), and is considered a rapid application development tool for developing relationally-organized, data-intensive software applications for personal computers. DataEase was created in the early 1980s by software developers Arun Gupta〔(Internet World Magazine - "An End To Web Coding: Toolmaker Aims For Discipline in App Engineering" by David F. Carr )〕 and Joseph Busch. The first version of the software was released in 1981 by Software Solutions Inc. The principals sold the company to Sapphire International Corporation of the United Kingdom in 1991. Sapphire continues to develop and market the product. There are two distinct product arcs in DataEase' history: DataEase for DOS and DataEase for Windows.
== DataEase for DOS ==
Originally called Datamaster,〔(A Brief History of DataEase )〕 DataEase' early hallmark was the ease with which non-programmers found they could rapidly develop useful software applications. DataEase' design emphasized the visual design of screen forms and reports while hiding almost all of the arcane details such as properties of the underlying data structure. In addition, complex data management processes that would typically require a multitude of complex steps to complete with traditional programming tools were handled automatically and transparently as a user made changes to his/her application.〔(The Probert Encyclopedia of Science & Technology entry for DataEase )〕 For example, when editing an existing form, if the user removed a field, added another, indexed another and changed the data type of yet another, the necessary steps required to reflect those changes in the data structure underlying the form were automatically and non-destructively applied when the form was saved.
Report writing was similarly streamlined. The user simply defined access to the desired data using a simple procedural language known as ''DataEase Query Language'' (DQL). A prompting script editor, which permitted any user to instantly create DQL script with no prior knowledge of DQL syntax remains one of DataEase' most overlooked and beneficial features. One was not required to memorize details about the application's components or DQL syntactical construction prior to writing a valid DQL script.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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