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Description: 设计模式——访问者模式
Visitor模式允许我们在不改动原有结构的基础之上不断增加新的功能。
ICumulation接口定义了方法Cumulate()，旨在计算1＋2＋……＋n，有两种不同的实现方法，一个是一般的叠加算法GeneralArithmetic，一个是高斯算法GaoSiArithmetic。
因为某种原因，系统需要添加求平均值的功能，还有计算1到n的平方和。
按照一般的思路，我们需要在ICumulation中定义两个方法分别计算平均值和平方和，并在实现类中同时添加相应的方法。在搭建了visitor模式的架构以后，添加功能的代码被移植到ICumulationVisitor中，添加的两种功能也分别被以子类AverageVisitor和PowerVisitor实现。
功能的扩展从在类中添加方法的方式变成了添加新类的方式，该类继承一定的Visitor接口。这是一个90度的转换，使得架构符合开放封闭(OCP)原则：功能的扩展无需改动原有代码。
同时，这里也体现了单一职责原则(SRP)，ICumulation层次结构可以因为出现了不同的算法而改变，但是不应该因为需要计算不同的东西(功能)而改变，算法和功能是横向和纵向的关系。这里visitor模式隔离了算法和功能，ICumulation层次结构负责算法，ICumulationVisitor层次结构负责功能。-design patterns -- Visitor visitors model allows us to model without changing the original structure on the basis of constantly adding new features. ICumulation interface definition of the method Cumulate (), designed to calculate a +2 + ... + n, there are two different method, a general superposition GeneralArithmetic algorithm, is a Gaussian algorithms GaoSiArithmetic. For some reason, the system needs to add functions for the average, there is a calculation of n and the square. As a general idea, we need to define ICumulation two methods were calculated and the average square, and in achieving category by adding the corresponding method. The erection of a visitor model, after adding functional code are transferred to ICumulationVisitor, adding the two functions were also a subclass Aver
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Author: linhuibaby |
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Description: Oracle database 10g (Oracle certified professional - OCP) certification all in one exam guide handbook
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Size: 14496214 |
Author: Sergey |
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Description: 本讲稿(ORACLE8i 数据库基础)是作者在多年的工作和授课中的总结，主要包括两个部分，第一部分是ORACLE SQL*PLUS基础，主要讲述ORACLE 应用系统设计的基本知识和给出一些有用的实例；第二部分是介绍ORACLE PL/SQL知识，主要讲述ORACLE数据库PL/SQL程序设计所用到基本知识，这部分给出进行应用设计所必需的基础知识。这两部分的内容都尽可能做到内容简洁而全面。特点是，1.用简单明了的语句对解释各个部分的内容，省去一些理论性的解释；2.给出作者在应用设计和开发中的一些具体的例子，为软件人员提供一些借鉴，省去查阅大量资料的时间。3.给出了许多资料所没有提供的一些使用技巧，如导出触发器等。总之，内容基本上包括当前Oracle8I的最新内容。同时也覆盖了最新的ORACLE8i OCP培训大纲的内容。不仅包含ORACLE 程序设计人员、DBA所必须掌握的知识，而且还含盖了系统分析员所要求的内容。与本书（讲稿）相伴的还有《Oracle8i/9i初级数据库管理》和《Oracle8i/9i高级数据库管理》。-the script (based on Oracle 8i database) is the author of many years of work and teach the summary, mainly consists of two parts, the first part of the Oracle SQL* PLUS based mainly on Oracle Application System Design and the basic knowledge gives some useful examples; The second part is devoted to Oracle PL/SQL knowledge, mainly on Oracle Database PL/SQL procedures used by the design of basic knowledge, which is part of the design application for the necessary basic knowledge. These two parts of the content as possible, concise and comprehensive. Features, 1. Use simple words to explain the various parts of the content, eliminating some theoretical explanation; 2. The author is in the application design and development of a number of specific examples, provide some software reference
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Size: 545792 |
Author: zdq |
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Description: ORACLE8i 初级数据库管理员是作者在多年的Oracle工作和授课中的总结，主要包括两个部分，第一部分是ORACLE8i RDBMS日常管理基础，主要讲述ORACLE 的日常管理内容；第二部分是ORACLE9i 的安装与管理，主要讲述ORACLE9i iAS应用服务器的安装与入门、Oracle9i RDBMS 数据库系统的安装与新功能。每一部分内容都尽可能做到内容简洁而全面。内容全部覆盖了最新的ORACLE8I OCP培训大纲的内容。不仅包含ORACLE DBA所必须掌握的知识，而且还含盖了系统分析员所要求的内容。与本书相伴的还有《Oracle8I数据库基础》，《Oracle8i 高级数据库管理》。-Oracle 8i database administrator is the primary author of the years of work and delivery of Oracle's conclusion, including the two main parts, the first part of the daily management of Oracle 8i RDBMS based mainly on the daily management of Oracle; ORACLE9i second part of the installation and management, mainly on application service ORACLE9i iAS Works for the installation and entry, Oracle9i RDBMS database system installation and new features. Each part of the contents are as concise as possible and comprehensive. Covering all the details of the latest ORACLE8I OCP training syllabus content. ORACLE DBA includes not only by the need to master knowledge, but also a systems analyst covering the required content. And the book is accompanied by "Oracle8I database infrastructure",
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Size: 1072128 |
Author: zdq |
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Description: (Sybex) - OCP Introduction to Oracle 9i SQL Study Guide (Sybex) - OCP Oracle 9i DBA Fundamentals I Study Guide-(Sybex)- OCP Introduction to Oracle 9i SQL Study Guide (Sybex)- Oracle 9i OCP DBA Fundamen tals I Study Guide, etc.
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Author: 王王 |
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Author: 陈振华 |
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Description: Oracle database 10g (Oracle certified professional - OCP) certification all in one exam guide handbook-Oracle database 10g (Oracle certified professional- OCP) certification all in one exam guide handbook
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Author: Sergey |
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Description: Oracle数据库9I DBA管理员教程，OCP的考试上课资料。-Oracle database administrator 9I DBA Guide, OCP exam class information.
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Description: Oracle数据库9I DBA管理员教程，OCP的考试上课资料第二本。-Oracle database administrator 9I DBA Guide, OCP exam a second class of information.
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Description: ocp for oracle 9i 考试资料-ocp for oracle 9i exam information
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Description: 业界领先的嵌入式处理器和IP 提供商，已经采用开放式芯片协议(OCP)接口作为芯片内建
总线的标准-Industry-leading provider of embedded processors and IP, have adopted open-chip protocol (OCP) interface as a standard-chip bus
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Author: 王浩 |
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Description: oracle OCP 中的 007考题,是学习的OCP的重要参考之一-007 of the oracle OCP test, OCP is learning one of the important reference
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Description: oracle 考试
OCA-OCP Oracle Database 11g All-in-One Exam.pdf-OCA-OCP Oracle Database 11g All-in-One Exam.pdf
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Description: 《Oracle数据库DBA专题技术精粹》从DBA的角度阐述了Oracle数据库的结构内幕、管理经验和优化技巧，并列举了很多实用的案例。本书主要分为五大部分，基础篇主要介绍了一些基础技术与OCP认证相关的一些内容，内各种平台上安装与建库的技巧以及在9i里面出现的新特性；结构篇包括对回滚段、存储结构等的深入讨论，并彻底阐述了困扰许多用户的字符集问题；备份与恢复篇列举了大量实际案例，讲述了在不同的需求环境下所应采取的备份方案以及进行故障恢复的方法；性能篇深入分析了Statspack等常用的调整工具的原理与使用方法、判断依据，并从锁、内存、索引、执行计划等各个角度介绍了各种优化技巧；网络篇主要介绍了监听器、透明网关、数据迁移等方面的。-"Oracle Database DBA special technical essence" from the DBA perspective of the insider Oracle database structure, management experience and optimization techniques, and lists a number of practical cases. This book is divided into five parts, based on article introduces some basic techniques and some of the elements related to OCP certification, installation of various platforms and building a database of skills and which appears in the 9i new features structure of articles including rollback section, the storage structure of the in-depth discussion, and thoroughly describes the user s character set that plagues many problems backup and recovery chapter lists a large number of actual cases, about the needs in different circumstances to be taken by the backup program and fault recovery method performance-depth analysis of articles and other commonly used Statspack to adjust the principle and use tools to determine the basis, and from the lock, memory, indexes, and other point of view
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