基于ASP.NET技术的数据库访问通用类设计

ASP.NET是新一代的B/S系统编程工具,集众多优点于一身,在对数据库的操作上更是功能强大。但是传统的数据访问编程方式操作繁琐,而且重复累赘。本文以C#语言、SQL Server数据库为例,利用ADO.NET数据库访问组件,介绍了一种基于ASP.NET技术的数据库访问通用类设计方法。     

ADO.NET数据访问模型研究

ADO.NET是基于.NET框架的应用程序访问数据库的方式.ADO.NET是ADO的改进和完善版本,它开辟了分布式应用程序访问数据库的新天地,ADO.NET本身的许多新特性使它更适合于网络应用.文章首先简述了ADO技术的发展,接着重点讨论了ADO.NET技术及其数据访问模型,并将其和ADO进行比较,最后详细给出了一个ADO.NET的应用实例.     

基于的ADO.NET数据库访问技术研究

ADO.NET是微软针对ADO的缺陷而重新设计的一种全新的数据库访问技术。阐述了ADO.NET的结构与数据模型:数据提供程序和数据集。探讨了利用ADO.NET技术访问数据库访问的方式,同时给出了采用C#语言所实现的ADO.NET数据库访问技术在数据库中编程中的具体实现方案。     

ADO.NET数据访问模型研究

ADO.NET是基于.NET框架的应用程序访问数据库的方式。ADO.NET是ADO的改进和完善版本,它开辟了分布式应用程序访问数据库的新天地,ADO.NET本身的许多新特性使它更适合于网络应用。文章首先简述了ADO技术的发展,接着重点讨论了ADO.NET技术及其数据访问模型,并将其和ADO进行比较,最后详细给出了一个ADO.NET的应用实例。     

创建基于.NET的通用数据库访问层

一、引言 ADO.NET为应用程序开发人员提供了一种全新的数据库访问机制,它使得数据库编程变得相当容易。然而,在运用ADO.NET进行数据库编程时,开发人员往往会因为不注意某些细节问题而使得应用程序的可扩展性很差,某个数据库应用程序只能应用于某个特定类型的数据库,而不能和更多的其他     

ADO.NET数据访问体系结构研究

ADO.NET是基于.NET Framework平台下的数据访问技术,该文介绍了ADO.NET的数据访问工作机理,并对ADO.NET和ADO进行了简单比较,分析了ADO.NET框架下访问数据库的两类核心组件,最后给出了采用ADO.NET访问不同数据库需要引入相应的命名空间。     

ADO.NET数据库访问技术在ASP.NET开发中的研究与应用

数据库访问技术是应用软件系统开发中非常重要的技术之一。以往应用软件对数据库的访问实现复杂,访问效率低。文中介绍了一种应用简单且数据库访问效率较好的数据库访问技术ADO.NET技术。详细介绍了ADO.NET数据库访问技术的对象模型组成,访问数据库的原理及一般操作步骤,最后通过一个具体的ASP.NET网站开发实例来说明了其应用。应用实例显示,ADO.NET数据库访问技术的应用简化了开发中数据库访问技术,提高了访问效率,同时还提高了数据访问的安全性。通过对此技术的研究与应用,希望能给相关的软件开发人员及数据库访问技术人员提供借鉴与参考。     

基于C#的ADO.NET数据访问技术的应用研究

介绍了在.NET平台下,ADO.NET通过.NET数据提供程序访问数据源的方式和5个主要访问数据库的对象,提出了ADO.NET访问数据库的两种方式,在VS.NET环境下,建立了使用DataReader对象和DataSet对象访问数据库的C# Windows应用程序,对访问数据库的关键代码进行了分析,总结了ADO.NET访问数据库的一般步骤。     

ADO.NET组件在企业信息系统中的研究与实现

数据访问技术是当前分布式系统应用的关键技术。讨论ADO.NET组件的对象模型、Oracle.NET几个重要的类及DataSet等对象的使用,利用C#语言通过SQL语句、存储过程和函数等方式对企业MIS中的Oracle数据库访问和实现进行详细的论述,并对ADO.NET组件的应用给出了若干建议,实践证明,该技术成功的开发了高性能、高效率、可伸缩性好的企业信息系统。     

ADO.NET访问数据库技术的分析与应用

介绍了ADO．NET数据存取技术，分析了ADO．NET中的数据对象及方法的使用。通过具体实例，介绍了ADO.NET数据访问技术在数据库编程中的具体实现。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate