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文献来源:AbrahamSilberschatz, HenryF.Korth, S.Sudarshan,等. 数据库系统概念[M]. 高等教育出版社, 2014. Advanced SQL In Chapters 3 and 4, we provided detailed coverage of the basic structure of SQL. In this chapter, we cover some of the more advanced features of SQL.1 We address the issue of how to access SQL from a general-purpose programming language, which is very important for building applications that use a database to store and retrieve data. We describe how procedural code can be executed within the database, either by extending the SQL language to support procedural actions, or by allowing functions defined in procedural languages to be executed within the database. We describe triggers, which can be used to specify actions that are to be carried out automatically on certain events such as insertion, deletion, or update of tuples in a specified relation. We discuss recursive queries and advanced aggregation features supported by SQL. Finally, we de
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外文翻译 无线传感器网络数据管理系统开发 关于JavaScript - JavaScript _ MDN 关于 JavaScript 什么是JavaScript? JavaScript(通常缩写为JS)是一种轻量级的、解释性的、面向对象的语言,它功能卓著,在写Web页面的脚本语言方面最为出名,但也在许多非浏览器环境中使用。它是一种基于原型的多范式脚本语言。它是动态的,并支持面向对象、命令式和功能性的编程风格。 JavaScript在网络的客户端运行,可用于设计/编程网页在事件发生时的行为。它是一个易学习、强大的脚本语言,广泛用于控制网页行为。 与通常的望文生义相反,JavaScript不是“解释Java”。简单地说,JavaScript是一种动态脚本语言,支持基于原型的对象构建。其基本语法故意与Java和C 类似,以减少学习语言所需的新概念数量。语言结构,如:if语句,for和while循环,以及s
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Database Management System You know that a data is a collection of logically related data elements that may be structured in various ways to meet the multiple processing and retrieval needs of organizations and individuals. Therersquo;s nothing new about data base-early ones were chiseled in stone, penned on scrolls, and written on index cards. But now database are commonly recorded on magnetically media, and computer programs are required to perform the necessary storage and retrieval operations. The system software package that handles the difficult tasks associated with created, accessing, and maintaining database records is in a DBMS package establish an interface between the database itself and the users of the database. (These users may be applications programmers, managers and others with information needs, and various OS programmers.) A DBMS can organize, process, and present selected data elements from the database. This capability enables decision makers to sea
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英语原文共 6 页 基于排斥过程的知识门户服务 目录 摘要 2 第一章 简介 3 第二章 排斥过程对于研究所面临的挑战 4 第三章 现代社会下的知识门户 6 第四章 专用知识门户的概念 10 第五章 结论和对未来的研究 13 参考文献 14 摘要 在大众的眼中,排斥现象被理解为一些群体或者个人被永久的封锁在某些资源之外的过程(也叫做社会排斥)。当然,不论是从“局外人”还是地方或者全社会的角度来看,这种现象都是不必要的。排斥(他的反义词是包容)现象可以从许多方面研究:把排斥现象看做是一个过程,在这个领域多方面的研究找出解决方案。 为了成功的解决这一现象,被涉及到的群体和个人应该采用ICT解决方案。本文由五个部分组成,逐步提出问题的背景,并给出了解决方案。在短暂的研究背景介绍
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