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在今天的信息产业中,任何稍具规模的系统都会用到中件(Middle ware),有的会用到很多中件。住所谓的开放系统环境中,沟通不同系统成分的主要部件,也是中件。但是,很多中件本身都是专用产品,是一些小太起眼的小公司开发出来的。中件的类型和形式十分庞杂。有在诸如由DCE所规划的异构操作系统环境中起作用的中件;有为面向对象的应用提供消息服务的中件;有在事务监督与控制中起作用的中件;还有其作用是沟通SQL方言的中件等等。
In today’s information industry, any slightly-sized system will use Middle ware and some will use a lot of middleware. Living in the so-called open system environment, the main components that communicate different system components are also middleware. However, many middleware itself is a dedicated product developed by a few small, startled companies. The type and form of the middleware is very complicated. There are middleware that works in heterogeneous operating system environments such as those planned by DCE; middleware that provides messaging services for object-oriented applications; middleware that has a role in transaction monitoring and control; and its role Is to communicate SQL dialect, and so on.