查询词典 database access

At present, there are two branches in the research of database security technology, which are secure database management system and enhancive database security system. According to the view of enhancive database security system, this paper takes the typical TCSEC model as reference. An agent system is built between database client and database server for secure communication, SQL parsing and access controlling.

目前，我国数据库安全技术研究主要有安全数据库管理系统和数据库安全增强系统两个方向，本文主要从数据库安全增强系统的角度出发，参考经典的TCSEC监视器模型，在数据库客户端和服务器端之间建立一个代理系统，来完成数据库的安全通信、SQL分析和访问控制等功能。

The design and establishment of a database based on the road comes off file management system.

本文设计并建立了一套基于ACCESS数据库的路产档案管理系统。

This kind of database can make medium or small scaled system.

用Access作中小型系统的数据库不失为一个好的选择。

For example, in the case of an application such as video-on- demand, special services on the video serer side for support of real-time database access and transmission must be developed

例如，在视频点播应用中必须开发出用于支持实时数据库访问和传输的视频服务器专用服务[RVG+93]。

The managing and booking system, its development that basic information sum structure of beak labor cost superintendence the system is a model to primarily include the creating of postscenium database the sum to support and the front end apply the procedure's development tael the side.

介绍了数据库技术以及WEB数据库技术的背景及Windows NT IIS SQL Server Access ASP系统的一般原理。阐述整个基于WEB数据库技术构建的动态网站的系统结构及工作原理；分析了系统实现中的难点和重点。

The algorithm first takes count of the browse number of each access sequence by overlapping operation,then unites and deletes the unfrequent page items according to minimum support degree given by users,afterwards sifts getting the intersections of each two user access pattern and gives birth to candidate grequent access patterns,at last,adds up the number of each candidate frequent access pattern by scanning the original database.

该算法首先对用户项集进行重叠操作统计浏览次数，然后合并，依据用户给出的最小支持度删除原项集中的非频繁页面元素，并对两两用户项集筛选生成候选频繁项集，最后扫描数据库，统计各个候选频繁项集的支持度计数。

A corrosion database system for thermal devices of thermal power plant is described. With Access97 as database platform, this database stored corrosion information of 30 common metals in many kinds of corrosives. With SQL inquiry, more than 10 inquiry ways can be provided. With Excel97 as report server, report can be generated very conveniently. This database system is easy to operate and can provide remote access service also.

摘 要：介绍了火电厂热力设备腐蚀数据库系统，以通用的中文Access97库为平台，存放了30余种常用金属材料在多种腐蚀介质中的腐蚀数据及相关信息；利用SQL查询方式，提供了十几种查询途径；报表输出采用Excel97作为报表服务器，实现数据库与输出报表的顺利连接；开发出的软件界面友善，并具备提供远程网上查询的功能。

The invention discloses an access control table and safety policy database method in data communication field, including: 1, initializing a Radix tree of access control table or safety policy database; 2, constructing clauses and subclauses of a rule; 3, inserting the rule in the Radix tree; 4, repeating the steps 2 and 3, in order to insert all the rules in the Radix tree, and forming the complete access control table or safety policy database; 5, searching matching rules.

本发明公开了一种数据通讯领域中访问控制列表和安全策略数据库的方法，包括：1。对访问控制列表或安全策略数据库的Radix树进行初始化；2。构造规则条目；3。将规则插入Radix树；4。重复第二步和第三步，将所有规则插入到Radix树中，形成整个访问控制列表或安全策略数据库；5。查询匹配的规则。

What's more, with fundamental research, the following solutions were put forward: Database connectivity technology, Which can help to implement this system which works in Client/Sever mode; the method of directly giving the Database system's operating purviews to right users with the application of DBMS' s authentication mechanism, which help to control Database's access; And also has set up user's password and managed the subsystem, in order to ensure the safety of database Formulation ,typing of the report form and connection technology of the database.

这些关键技术包括数据库连接技术，以实现客户/服务器模式下的数据库开发；结合数据库管理系统的自身鉴别机制，将数据库的权限赋予用户，以控制用户对数据的访问，并设置了用户密码管理子系统，以确保数据库的安全。还有报表的生成、打印及其与数据库的连接技术。

If a "reasonable" notion of database consistency is to be supported (I.c. the database system is to enforce it automatically), there are bound to be" conflict" situations where one transaction comes into an access conflict against some other transaction. If await is to be avoided,some means of a negotiated settlement of the conflict must be provided, thereby dragging the users into the details of concurrency control.The single-database model is more appropriate-ate than the multiple-database model in an environment where it is difficult to determine in advance logical partitions of the database that correspond to work to be performed, and the users closely cooperate.

如果一个数据库一致的合理观念要得到支持（即数据库系统要自动实行这个观念）、一定会有矛盾的情形产生、在这种情形中一个业务与其它业务产生存取矛盾如果要避免等待，就必须提供某种协商解决矛盾的方法，从而迫使用户详细了解并行控制单一数据库模式在某一种环境中比多个数据库模式更恰当，在这个环境中，要事先确定与要执行的工作相适应的数据库的逻辑分割是很难的，同时用户们又紧密地合作在一起。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。