．NET数据库访问技术的研究

数据库系统是计算机编程中应用最广泛的领域。在ADO．NET以前,许多应用程序都是通过ADO提供的软件对象来访问数据库的．而ADO的底层则是OLEDB和ODBC技术。本文比较了ADO．NET与ADO技术的异同,分析了ADO．NET访问数据库的特点,指出在互联网环境下．使用ADO．NET对数据库进行访问,具有显著的优越性。     

基于ADO．NET数据库访问技术的研究与实现

ADO．NET是基于．NET平台下的数据库访问技术，本文阐述了ADO．NET的功能、结构和对象模型．给出了基于C#．NET的ADO．NET技术访问数据库的具体实现过程，并给出了部分实现代码。     

基于ADO.NET技术的数据库访问研究

对基于ADO.NET技术的数据库连接访问模式进行分析研究.数据库访问是W eb数据库系统中最频繁的操作,是一个核心问题,而传统的数据库访问技术存在许多缺点.随着ADO.NET技术的推出,数据库访问方式也得到了改进.     

基于ADO.NET的数据库访问技术研究

介绍了ADO．NET类的体系结构．详细阐述了．NET中四种数据库访问方式对应的数据提供器及其命名空间的引用．以SQL Server数据库的访问为例介绍了ASP．NET环境下利用ADO．NET访问数据库的技术，并给出了部分的实现代码。     

提高ADO.NET连接数据库性能的方法探究

.NET平台是Microsoft推出的新的程序开发平台,集成了多种开发语言,它实现了企业级Web应用程序的快速开发。开发过程中,通过数据库访问类ADO.NET对数据库进行访问操作。ADO.NET是Microsoft推出的一组用于和数据源进行交互的面向对象类库,通过其可以快速的访问数据库。但是,在访问过程中,一些技巧或是技术如果运用得当,可以在一定程度上提高访问性能。本文将从几个方面来探讨提高ADO.NET访问数据库性能的方法。     

ADO.NET访问WEB数据库方法研究

介绍了ADO．ENT对象模型和ADO．NET的一些特性，提出了ASP．NET中利用ADO．NET访问WEB数据库的解决方案，结合一个实例，详细介绍了ADO．NET访问数据库的方法及步骤．     

ADO.NET离线操作数据库的研究与实现

ADO.NET是DOT NET Framework用于访问数据库的组件。通过ADO.NET可以连接方式或离线（断开）方式访问远程的数据库,从而提高了应用程序的性能,减轻了远程服务器的压力,本文首先简述了ADO.NET的对象模型,然后重点阐述了离线操作数据库的方式及应用,最后给出了离线操作SQL Server多个数据库表的一个具体应用实例。     

利用ADO.NET技术实现数据库访问

针对 ASP 代码逻辑混乱、难以管理、代码可重用性差、运行速度慢、不易调试以及必须始终连接数据库浪费网络资源的缺点,提出了用 ASP.NET 和 ADO.NET 技术访问数据库的方法。利用 ASP.NET 的组件技术和封装方法实现对数据库访问可以在安全性和运行效率方面得到显著提高。最后论文通过一个实例说明如何利用 ASENET 技术和 ADO.NET 数据库存取模型实现对数据库的访问。     

ASP.NET连接SQL Server数据库的实现

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 SERVER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,并深入分析了多种ADO.NET数据访问模型,并给出在ASP.NET中使用ADO.NET连接SQL Server数据库的各种方法。结合各种连接方法的特点,对各种方法的性能进行了分析比较,最后给出最优连接方法。     

ADO.NET数据访问技术在实验教学管理系统中的应用

本文通过对ADO.NET数据访问技术的介绍,用实例说明该技术在实验教学管理系统中的应用.在应用中主要探讨数据访问模型的选择、怎样通过ADO.NET的数据库连接池技术提高数据访问效率以及ADO.NET对事务的支持.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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