一种数据库访问代码自动生成方法

使用ORM框架访问数据库效率较低,对执行效率有要求的项目一般采用纯手工编写数据库访问代码,但纯手工编写重复的数据库访问代码需要耗费大量时间.文章提出一种数据库访问代码自动生成方法,指出了自动生成代码需要解决的三个关键问题,并以SQL Server数据库为例,描述了生成C#代码的过程.使用数据库访问代码自动生成方法,生成的代码规范、易于维护,节省了程序员编码时间,提高了开发效率.     

网络化的玉米专家系统中Web数据库的实现

介绍了网络化的玉米专家系统中 Web数据库的实现 ,着重讨论了降低访问 Web数据库和传送 Web数据库信息到浏览器所用的时间、提高系统效率的方案及其实现方法。     

优化SQL对ORACLE数据库性能的提高

影响ORACLE数据库性能的原因很多,论文通过优化SQL语句的几点措施,以期改善数据库的访问效率,经实际项目验证,能够明显的提升数据库性能。     

基于终端与数据库的动态选择交互机制

设计并实现一种基于终端与远程数据库的访问机制。以Android终端为例,通过研究分析各种数据库访问技术的优劣和安卓系统的多种通信协议接口,摒弃了传统的单一通信方式和单一数据库访问方式的数据库访问方法,提出一种协议和数据库访问方式智能选择的方法。该方法设计的机制,能够根据数据库类型、网络环境等客观因素动态调整协议和数据库访问方法,提高了终端访问数据库的效率和稳定性。在大量实际测试中,对该机制中的两个核心参数K、M的最佳取值做了详细研究,并给出了相关曲线图。     

用VB实现用户登录与用户信息修改的探讨

探讨了应用VB实现用户登录与用户信息修改等模块的原理，选择了其实现方案，并提出了一种采用Data Control访问VB6．0内置Microsoft JET DBEngine的具体实现方法。这种方法提高了系统代码的重用性及运行效率，可以作为VB访问数据库的技术，移植到其他数据库应用程序中。     

基于.NET的线程池技术及其应用研究

数据库的访问效率是影响应用系统运行效率的关键因素,采用何种方法提高数据库访问效率是软件开发人员普遍关注的问题,也是研究中的难题。本文基于.NET平台,利用多线程技术来处理与分布在不同机器上的多个数据库交互,线程池技术减少了线程创建和销毁的开销,提高了线程的可重用性,因而可以有效提高服务器端效率。该种方法为提高数据库访问效率提供了一种有效的途径。     

基于设计模式的校园网异构数据整合方案研究

针对目前大多数高校迫切的校园网异构数据资源整合需求,文章提出了一套基于设计模式的有效解决方案.Facade外观设计模式使得校园应用子系统具有一个一致的访问异构数据库资源的界面,提高了数据访问方式的灵活性.Singleton单例设计模式的使用提高了应用程序与数据库的互访效率,而且增强了系统的稳定性.该方案具有独立于应用层开发语言、提高数据访问方式的灵活性,提高系统的可移植性和扩展性等优点.     

基于ASP处理数据库的优化问题的探讨

ASP作为目前使用最常见的网站建设工具,它的易操作性得到了很多网站设计人员的好评。ASP一个最重要的功能,就是它可以让你非常轻松地连接数据库;有很多资料提到ASP访问数据库的速度问题,并提出了相应的优化方案,可在实际的网站开发与建设中能真正实现的并不多。本文就从实际设计出发,阐述设计与开发ASP网站中．在处理数据库的过程中,应使用哪些技巧,从而达到优化程序代码,提高数据处理效率的目的,让自己设计的网站有更强的竞争力。     

基于J2EE数据库连接池中连接泄漏问题解决方案

介绍了数据库连接池的工作原理,通过对连接池管理机制的分析,提出了解决连接泄漏问题的回收连接技术,并给出了此技术的一种实现方案,这有助于改进连接池的性能,提高web数据库的访问效率。     

Java访问数据库的效率优化研究

在Java的应用中,访问数据库是一个非常重要的环节。本文首先介绍了访问数据库的四种模式,并进行了详细的比较分析,其次对SQL语句的优化以及连接池原理及使用进行了阐述。用户可以通过选择不同的数据库访问模式、优化SQL语句以及连接池的使用等方法来提高访问数据库的效率。     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with