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C/S架构和B/S架构:
C/S(Client/Server)结构分为客户端和服务端两部分。服务端存储数据库内容,并在客户端上安装相应软件。C/S 结构按照架构分为双层结构和三层结构。
双层结构中的表示层和业务逻辑层部署在客户端,主要提供用户界面,接受用户提交的请求,并将用户请求发送至服务端,申请数据库服务。数据层则部署在服务端,负责数据库的业务处理,包括查询数据库、排序、索引等操作,对数据进行处理后将结果返回客户端。随着信息技术的发展,软件复杂性也在不断提高,传统的双层
C/S
结构存在很多局限性,如客户端负载重、服务器的性能无法满足要求等。此外,一旦系统需求发生变化,客户端和服务端的应用程序都需要变更,给维护和升级带来极大不便。
B/S(Browser/Server)架构,即浏览器/服务器结构。Browser客户端是指Web浏览器。在
B/S架构中,主要业务逻辑在服务器端实现,极少数事务逻辑在浏览器中实现,减轻了客户端的压压力。因此,B/S架构被认为是瘦客户端。B/S架构的系统无须特别安装,只有Web浏览器即可。同时,B/S架构较C/S架构的应用维护和升级有较大的便利。
三层架构:
为了满足更大规模的客户机群和服务器群的业务需求,开发了一个三层体系结构,分为表示层、业务逻辑层、数据层,将双层结构中客户端的业务逻辑层迁移出来,客户端只保留表示层。
表示层:主要完成用户与应用程序之间的交互,包括接受用户输入的数据,显示应用的输出结果。在此层中,通常不包括系统的业务逻辑,逻辑代码仅与界面元素有关。如分页显示、图片轮播等。
业务