基于实体类的数据库访问技术的研究与实现

实体类隔离了代码对数据库的依赖,降低了开发的难度。本文分析了Java语言中传统数据库访问技术与基于实体类的数据库访问技术的优缺点,简述了基于实体类的数据库访问技术的一般过程,并结合一应用实例说明了它的使用方法。     

ADO.NET技术在访问SQLSERVER数据库中的应用

随着分布式数据库应用的深入,永久的数据库联接是相当耗费资源的。在访问SQLSERVER数据库中,采用ADO.NET技术可以完美地解决这个问题。本文讨论了ADO.NET的主要对象,并深入分析了其访问SQLSERVER的过程。     

RDO远程访问SQL Server数据库技术分析与实现

从RDO对象模型开始,分析了RDO访问SQL Server数据库的存取技术及实现过程,详细介绍在数据库编程中如何使用RDO访问SQL Server数据库。     

ADO．NET技术在访问SQL SERVER数据库中的应用

随着分布式数据库应用的深入，永久的数据库联接是相当耗费资源的。在访问SQL SEKVEK数据库中，采用ADO-NET技术可以完美地解决这个问题。本文讨论了ADO．NET的主要对象，并深入分析了其访问SQL SEKVEK的过程。     

基于EJB的数据库访问技术

分析EJB组件访问数据库的实现技术及优势,给出EJB体系结构中SessionBeans和EntityBeans访问数据库的实现过程。     

基于LabWindows／CVI和ADO的动态访问数据库的实现

介绍了数据库访问技术——ADO技术,探讨了LabWindows／CVI基于自动化的数据库访问机制和建立驱动程序的过程,提出了动态创建Access数据库的方法,详细说明了在LabWindows／CVI中如何使用ADO动态访问数据库,最后给出了利用该方法实现Access数据库的访问实例。     

浅析VB访问数据库的常见错误与难点

VB结合Access在信息系统的开发得到了广泛的应用,因而成为中专学生毕业设计的首选题目.文章对学生在开发的具体过程中的常见错误与难点进行了有效的分析总结,有利于加深学生对VB访问数据库技术的快速全面了解与应用,并对VB教学中数据库技术这个重难点给予有效可行的教学参考.     

基于ADO技术的稀土化合物数据库系统的设计与实现

：在稀土化合物Web数据库系统的开发过程中,涉及到大量的后台数据库访问操作,因此,数据库访问方法是该系统中的核心问题之一,而传统的数据库访问技术有许多缺陷。ADO技术是微软推出的一种基于Web的数据访问和数据库编程技术,为不同的应用程序访问相同的数据源创建了一个更高层次的公用平台。它不仅可以访问关系数据库,还可以访问非关系数据库。本文探讨如何将ADO技术应用到稀土化合物数据库系统的设计和开发中,以实现高效率的数据库连接访问。     

浅谈Oracle数据库在网络安全访问机制的作用

随着计算机技术的不断发展,作为计算机的核心部件数据库成为了当前的一个研究热点.Oracle数据库是一个由甲骨文公司所研发的简单快捷、操作性强的数据库,随着其广泛的应用,基于Oracle数据库的网络安全访问机制的安全问题日益突出,所以本文阐述了Oracle数据库在网络安全访问机制的作用,并对这个作用过程中存在的安全问题进行了分析,提出了相应的对策.     

基于OGSA-DAI的异构数据访问与集成的研究

分布式数据库技术的发展使得访问地理上分散的、数据结构不同的数据源成为可能.基于OGSA-DAI的异构数据库访问使用了Web Service技术来封装对远程数据库的访问,从来实现异构透明性.本文分析了OGSA-DAI的基本结构和功能,并通过具体示例演示异构数据的访问过程.     

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.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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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