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毕业设计论文 第 I 页 基于.NET的ORM框架设计的探讨和实现 摘 要 目前，ORM技术已成为软件工程领域的一个研究热点，ORM的应用能极大的降低业务层和数据层的耦合度，提高系统的可扩展性、可维护性和项目的开发效率，最主要的是它使面向对象的思想贯穿于软件项目的设计和开发过程，实现对象模型向关系模型的转化及数据持久化操作的透明性。

     本设计通过研究关系模型和对象模型的概念、组成及各自的优缺点，分析出两种模型间存在的阻抗不匹配问题及问题产生的原因；探讨基于.NET的ORM框架设计应有的组成部分及其实现方法。

    初步实现一个基于.NET的ORM框架——TCORM，在该框架中实现代码生成器、持久化API和对象关系映射原则三个部分；在“湖南大学离退休信息管理系统”开发中引入TCORM框架后，使系统以面向对象的方法进行设计和开发，其数据持久化操作完全透明化，验证出TCORM框架的可行性和实用性。

     本文详细叙述设计者对关系模型和对象模型的研究成果和对基于.NET的ORM框架设计的研究成果；概述TCORM的详细设计和具体实现，并展示TCORM框架在“湖南大学离退休信息管理系统”项目开发中的运用。

     关键字：对象关系映射，持久化，ORM，对象模型 毕业设计论文 第 II 页 The discuss and realize of ORM Framework based on .NET Abstract Nowadays the Object Relational MappingORM has become a new hotspot in the field of software engineering. The application of ORM can greatly reduce the coupling degree between the business layer and the data layer and improve the system’s scalability and maintainability. At the same time the efficiency of development is also improved. Using ORM Framework in application is equal to erecting a bridge between relational model and object model. It can free developers from rudimentary and repeated work and make them have more time to pay attention to the real commercial demand. The content of this design is to research the concept theoretical foundation of the object model and the relational model and analyze the reason which cause quotimpedance mismatchquot between the two models Moreover the theoretical technology about how to realize the ORM Framework based on .NET and the components of ORM Framework are discussed Whats more an ORM Framework based on .NET——TCORM has been realized which comprises a code-generator persistent API and a rule of object relational mapping At last the TCORM Framework was used in the development of quotRetire management system of Hunan Universityquot to validate its feasibility and practicability. The paper describes the research results in detail and summarizes the detailed design and realization of TCORM then shows its application in quotRetire management system of Hunan Universityquot. Key Words: object relational mapping Persistence ORM Object model 毕业设计论文 第 III 页 目 录 1．绪论 .................................................................. 1 1.1课题背景及意义 .......................................................................................................... 1 1.2国内外研究现状 .......................................................................................................... 1 1.3 ORM相关产品简介..................................................................................................... 2 1.3.1 ObjectSpaces .......................................................................................................... 2 1.3.2 NHibernate ............................................................................................................. 2 1.3.3 XPO ....................................................................................................................... 3 1.4 论文构成及主要内容 .................................................................................................. 3 1.5 本设计的主要成果 ...................................................................................................... 3 2．相关模型的研究 .................