III: Small: Database-driven Ajax applications

AJAX编程使上级性能和界面质量，是可比的桌面应用程序，尽管事实上，用户？浏览器与云上的远程服务器交互。挑战在于AJAX程序很难编写，因为它们本质上是结合了三种不同语言的分布式程序：浏览器端JavaScript，服务器端编程语言（例如，Java、PHP等）和SQL数据库访问。该提案开发了一个框架，用于从声明性的，数据驱动的，基于SQL的规范快速创建完全成熟的基于AJAX的Web应用程序页面。该提案提供了一种架构和基于SQL的页面规范语言，该语言足够抽象和声明性，以实现快速开发，同时它也是（a）高性能的，（B）使同一类数据驱动的Web应用程序能够手动编码。新颖的增量视图维护、分布式查询处理和并发控制技术提高了性能，而基于组件的页面结构将语言的数据方面与创建丰富接口的前端机制相结合。声明式规范导致快速编程、更少的错误和更容易的应用程序维护和发展，而框架解决了性能优化和正确性问题，并提供了一些功能，否则开发人员需要使用繁琐的自定义AJAX代码来处理这些功能。除了Ajax之外，这些成果还被用于Adobe的Flash、最近的微软的Silverlight和新兴的移动的应用程序平台。此外，他们还为UCSD做出了贡献。的Web应用程序开发课程，提供了一个原则性的方法架构和实现交互式数据驱动的应用程序。有关该项目的信息可以在http://db.ucsd.edu/NSF10FWD/上找到

AJAX programming enables superior performance and interface quality that is comparable to desktop applications, despite the fact that the users? browsers interact with a remote server on the cloud. The challenge is that AJAX programs are hard to write since they are essentially distributed programs combining three different languages: browser-side Javascript, a server side programming language (e.g., Java, PHP, etc) and database access with SQL. The proposal develops a framework for the rapid creation of fully-fledged AJAX-based web application pages from declarative, data-driven, SQL-based specifications. The proposal delivers an architecture and SQL-based page specification language that is sufficiently abstract and declarative to enable rapid development, while it is also (a) performant and (b) enables the same class of data-driven web applications with what can be manually coded. Novel incremental view maintenance, distributed query processing and concurrency control techniques enable performance, while the component-based structuring of pages blends the data aspects of the language with front-end mechanisms for creating rich interfaces.Declarative specifications lead to rapid programming, fewer bugs and easy application maintenance and evolution, while the framework solves performance optimization and correctness problems and provides functionalities that otherwise the developer would need to take care of with tedious custom AJAX code. The results are carried over besides Ajax to Adobe's Flash, the recent Microsoft's Silverlight and the emerging mobile application platforms. Furthermore, they contribute to UCSD?s web application development curriculum by providing a principled method of architecting and implementing interactive data-driven applications. The information about the project can be found at http://db.ucsd.edu/NSF10FWD/