Ajax allows you to create a page in any programming language, then refresh different parts of that page with information from a database or some other back-end server process.
Ajax允许以任何一种编程语言创建页面，然后用来自数据库或其他后端服务器过程的信息刷新该页面的不同部分。
If you then had a scripting language running in-process with the Web server, such as PHP, that connected to a database, this would be described as two tier.
如果用Web服务器运行某种脚本语言(比如php)，从而连接数据库，那么这可以看作两层。
This paper has a discussion on the process of information management design to use the common property of Database tools, query designer, class design, SQL language in the process of program design.
论述了在程序设计过程中，使用数据库开发工具独有的字段通用属性、查询设计器、类设计及SQL语言等功能，完成信息管理系统的设计过程。
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