Sql Server数据库事务浅析

信息系统提供的应用越来越复杂,数据库更新数据的频率越来越高,数据库中数据不一致、不完整的情况随之出现。为解决这类问题,在数据库中引入事务概念,以保证一系列的数据操作可以全部正确完成,不会因数据操作未完成,而导致数据的完整性出错。以Sql Server数据库为例,介绍了数据库事务的实际应用。     

Sql Server数据库数据恢复的几种实用方法

由于计算机系统硬件或软件故障,使数据库遭到破坏,数据库中全部或部分数据丢失.因此当发生上述故障后,希望能重构这个完整的数据库.这时需要能够高效而有全面的恢复受损的数据库.本文介绍了数据库恢复的基本过程,同时以Sql Server数据库为例,提出了几种实用的数据恢复方法.     

浅析元数据在数据仓库中的应用

元数据作为存储数据的数据,在各种数据仓库教材中都涉及到元数据的管理知识,但是在实际应用中对于元数据的管理却使用的很少,大多数据仓库开发人员都了解元数据的重要性,但是在真正应用中却很少使用,或者说不知道如何构建元数据库,本文就针对元数据的管理以及在Sql Server 2005中的具体实现。     

Sql Server数据库加密技术应用

随着信息系统越来越多的应用,数据的安全问题越来越受到重视。数据库安全性已经成为构造现代企业管理信息系统时必须考虑的问题,数据加密技术极大的解决了数据库中数据的安全问题,但实现方法各有侧重。本文主要讨论了数据加密算法以及密钥的管理,并以Sql Server 2005为例,实现一个简单的数据加密和解密。     

浅谈Sql Server数据库数据完整性

现今社会是一个数据化的社会,各行各业都有大量的,不同种类的数据进行交换。数据库的使用已经渗透到生活中的各个方面。而数据库的完整性是设计数据库的的重要内容,关系到数据库的性能的好坏。如何防止将一些无效的或错误的信息添加到数据库中呢？本文对Sql Server2005数据库数据完整性约束进行了探讨。     

SQL SERVER中用户数据库的备份还原策略

随着信息技术的快速发展企业的数据存储量越来越大，目前针对数据库中数据的攻击也越来越多，怎样提高数据的安全性和数据恢复能力一直是用户和厂商关注的焦点。备份是恢复数据最有效的方法，选择怎样的备份策略使得当损害来临的时候将损失减小到最小是备份还原的关键。本文主要讲解在微软Sql Server服务器中用户数据库的备份还原策略，对当前企业的数据安全和数据恢复提供参考。     

基于GIS的芜湖高速公路管理平台设计

面向芜湖高速公路管理处管辖区域,建立统一的信息管理平台;结合J2EE、Sql Server2008和GIS等技术,对系统进行了分析和设计;通过建立标准的数据规范,采集管理处营运管理数据,建立标准的芜湖高速公路基础数据库,集成GIS服务,弥补纯图形、纯文字、定量分析与定性分析脱节的缺陷;提高了空间数据的图形表达与属性数据的空间分析,实现了高速管理平台图文信息一体化、营运管理的地图查询和可视化管理。     

基于.NET数据库BLOB数据处理技术在MIS开发中的应用

SQL Server作为后台数据库在数据发布和收集中扮演了一个重要角色,然而W eb收信与发布的信息是多方面的,如何将图片、文件、多媒体数据等二进制大对象(BOLB)在SQL Server数据库中存取,是一项应用广泛的技术,为解决远程BLOB数据在SQL SERVER数据库中存储及处理的难题,以ASP.NET为开发工具,利用二进制数据流技术,成功实现了基于B/S模式的BLOB数据在SQL Server中的存取,并将此技术应用到W eb信息管理系统的开发.     

接地网腐蚀规律数据管理系统的设计与实现

介绍了一种应用于甘肃国家电网接地网腐蚀规律的数据管理系统,该系统采用B/S结构基于ASP.NET 4.0开发,数据库采用Sql Server2005,完成接地网相关测试数据的添加、删除、修改和查询功能,基于地图实现变电站的动态标注和动态缩放,展示了变电站相关的接地网测试数据和接地网土壤分布图,提供了接地网测试数据导入导出功能。基于数据库中的数据实现土壤评价。     

大气环境监测数据审核和分析系统的设计与实现

雾霾一度成为社会关注的环境污染问题,为了有效的治理雾霾,全国多个省市实现了空气质量自动监测系统,对各项大气参数值进行数据采集。本系统是对大气环境监测数据进行有效性、准确性处理。利用数据统计分析方法对监测数据进行异常数据审核和修订。本系统采用JAVA开发,后台数据存储在Sql Server 2008的数据库中。系统的实现不仅可以提高环境监测中心工作人员的工作效率而且这些处理后的数据也是以后进行空气质量预测的数据基础。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that