基于MIDAS构建多层分布式结构及应用

1.引言随着计算机网络技术的迅速发展,基于Client/Server(C/S)模型的分布式应用越来越广泛。追寻数据处理的发展史,自1980年第一个数据库管理系统的出现宣布了数据库世纪的开始,那时的观念是由应用程序控制数据库,这种数据处理的模式一般称为单层结构(1-Tier)。随着LAN、PC机的广泛应用,以及RDBMS、RAD技术的成熟,数据库应用开始转向C/S结构,即两层结构(2-Tier)。这种结构在近十年内不但得到了广泛的运用,而且还相当成功。与单层的结构相比,这种开放式体系结构的耗费大大降低,分布式的计

The Building and Application of Multilayer Distributed Structure Based on MIDAS

The multi-tiered distributed C/S system is superior to the two-tiered C/S system in many ways. But it is very difficult to develop a multi-tiered distributed application system successfully. A good technique to develop it is described in this article,which is the MIDAS technique of Borland Corporation. The paper introduces and anaylses the structurc,the technique and the operating process of building multi-tiered distributed application system based on MIDAS.and explains its superiority with examples.