共查询到20条相似文献，搜索用时 62 毫秒
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计算机操作考试取卷交卷系统是一个教学辅助的考试管理系统，由于计算机操作考试的用户比较多，因此，通过局域网的形式，使客户机直接和数据库服务器交换数据。在此系统中我们采用C/S 相似文献
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关系模型中的完整性是指数据库中数据的正确性和一致性。无论是单用户或多用户数据库，用户在操作中难免发生差错。如果对数据操作缺乏检验与约束，就难以保证数据的有效性。 相似文献
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随着计算机与网络的飞速发展,数据库系统安全问题日益突出。对数据库审计进行研究,通过数据分析,挖掘建立数据库正常行为规则库,实现数据库异常行为检测,进而提高数据库安全。主要采用数据挖掘中的AprioriTid算法,用该算法发现关联规则,然后利用关联规则将用户长期的操作习惯和操作权限挖掘出来,以达到审计用户行为的目的,确保数据库安全。 相似文献
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网络地理信息系统，利用地图信息技术将电子地图和数据库技术有机地结合在一起，使用户通过简单的操作即可获得多方位、多视角的信息。 相似文献
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为了提高数据库基础知识教学的质量,教师常常在课堂教学中演示数据库操作,但是数据库环境的部署往往费时费力。在线数据库系统基于B/S模式,可集成多种数据库环境,仅用浏览器即可完成基本数据库操作,为初学者提供了方便,提高了数据库教学的效率。 相似文献
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第九讲数据库管理系统ＦＯＸＢＡＳＥ＋（一）□李雪梅一、ＦＯＸＢＡＳＥ＋概述（一）数据库１．数据库的概念数据库是指存贮在计算机内的、具有一定结构的相互关联的数据的集合，它能为多个用户所共享，并且独立于应用程序。数据库是由很多数据库文件和若干辅助操作文件... 相似文献
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戈晓梅 《天津职业院校联合学报》2007,9(2):47-51
利用ASP,可以很容易地把HTML(超文本标记语言)文本、脚本命令及ActiveX组件混合在一起构成ASP页,以此来生成动态网页,创建交互式的Web站点,实现对Web数据库的访问。当用户使用浏览器请求ASP主页时,Web服务器响应,调用ASP引擎来执行ASP文件,并解释其中的脚本语言(JScript或VBScript),通过ODBC连接数据库,由数据库访问组件ADO(ActiveX Data Objects)完成数据库操作,最后ASP生成包含有数据查询结果的HTML主页返回用户端显示。用ASP中数据库连接的多种方法,可以有效利用ASP技术访问WEB数据库。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献