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21世纪是知识经济的时代，组织和利用知识信息的有力武器――数据库将继续得到广泛应用。数据库(Database，即DB)是存储在一起的相关数据的集合，是存储数据的“仓库”。其名词源于20世纪50年代，美国为战争的需要，把各种情报案中在一起，存入计算机。60年代数据库帮助设计了阿波罗登月火箭，推动了数据库技术的产生。70年代，数据库蓬勃发展，网状系统和层次系统占领了市场，并且关系数据库理论也日趋完善。80年代起，关系数据库产品已相当成熟，后来有了分布式数据库系统(Distributed Database Systems)、数据库机(Datsbase Machines)、知识库(Knowledge Base)系统相知识机。现在，数据库技术已成为计算机领域最重要的技术之一，它是软件学科中一个独立分支(即研究数据库的结构、存储、设计和使用的一门软件学科)。-The 21st century is the era of knowledge-based economy, organization and use of knowledge and information of a powerful weapon- the database will continue to be widely applied. Database (Database, or DB) is stored together a collection of related data is stored data "warehouse." The term originated from the 20th century, 50 s, the United States for the war needs, the case of the various information together into a computer. 60 s database to help design the Apollo moon rocket to promote the generation of database technology. 70 years, vigorous development of the database, network systems, and levels of the system o

属于网络工程类的书籍 这方面在网上很少见的-Belonging to the network engineering books in this respect rarely seen on the Internet

This the compiled java norms, these norms of a good programmer is very often used-This is the compiled java norms, these norms of a good programmer is very often used

Mini2440 shematics for debeloper boarfd

这是我用c语言构建的项目。

学生公寓管理系统:项目背景.术语及原意 .语言的选择-student apartment management system : the project background. Terms and intent. The choice of language

数值计算方法在C语言中的应用 介绍了数值计算方法与计算机程序语言相结合的重要性，在给出牛顿迭代公式之后，阐述了牛顿迭代法在do-while循环中的应用，然后通过实例基于曲线梯形面积求解方法，论述了矩形法和梯形法在for循环中的应用．最后指出：用正确的数值计算方法编写高效的计算机程序解决复杂的实际问题应成为当代理工科大学生必备的基础与技能-numerical calculation method in the C language to the application of numerical methods and computer programming language combined weight in particular, given the Newton iterative formula, explained Newton iteration in do-while loop, the application Then examples curve trapezoid area based solution discussed rectangular and trapezoidal method for the application cycle. Finally : with the correct numerical method to prepare efficient computer programs to solve complex practical problems should become contemporary science and engineering students essential infrastructure and skills

学生成绩管理 用PowerBuilder编译的程序!可用于学校学生成绩管理-student performance compiler with PowerBuilder management procedures! For students in a school performance management

GIS 系统框架源代码，常用的地图源代码完整，可直接使用。-Gis development source code,

稀疏矩阵的抽象数据结构的算法的实现，首先声明一个类，在该类的基础上实现数据的存储与矩阵的转置-sparse matrix of the abstract data structure of the algorithm to achieve and be the first to declare a class, In such on the basis of data storage and matrix transpose