The above example showed how to create a blank physical data model, but what if you already have the database defined and you want to modify your design.
上面的示例演示了如何创建空白物理数据模型，但是如果已经定义了数据库，希望修改设计，那么应该怎么办？
Frameworks that base the object model design on the structure of the database are called wrapping frameworks.
将对象模型设计建立于数据库结构之上的那些框架称为包装框架。
In short, just as you would not build a house without a blueprint, you should never design a database without a data model.
简单地说，就像你不会在没有蓝图的情况下就修建一栋房子一样，你决不应当在没有数据模型的情况下就设计一个数据库。
Database model: Encapsulates a logical and physical database design for this specific project.
数据库模型：封装供此特定项目使用的逻辑和物理数据设计。
When you start to get into even intermediate complexity in your relational database, you'll design things differently than you would with an object model.
即便是中等复杂程度的关系数据库，设计的东西也和对象模型不同。
From the physical data model File page, accept the default value for the data design project, specify ARCH_JKENT_HR_changes for the name for the physical model, and specify the database type.
在PhysicalDataModelFile页面上，接受数据设计项目的默认值，指定CMERDADemo_HR_changes作为物理模型的名称，然后指定数据库类型。
You can easily create a logical data model that is derived from business requirements and transform that into a physical data model that reflects your database design.
可以从业务需求轻松地创建逻辑数据模型，并把它转换为反映数据库设计的物理数据模型。
Design your database model by writing Ejb3 entity beans.
通过写ejb3实体Bean设计数据库模型。
The entity-relationship model has gained acceptance in database design and is widely used in practice.
实质- 联系的模型已经得到数据库的接收设计并且广泛地被用于练习。
Database design is crucial to effectively implement a relational database. In this course we discuss how to model data, database construction, and developing a database in a business environment.
数据库设计是有效地实现关系数据库的关键，该门课程主要介绍如何建立数据模型，数据库的创建以及在商业环境下如何开发数据库。
Fourthly, I will introduce the system model, design of database, arithmetic of training emulation flow, and the design of gentle training emulation process model and the system.
第四步，介绍了培训仿真流程系统模型和数据库设计、培训仿真流程实现算法、柔性培训仿真流程原型的设计以及系统的设计。
After comparing all kinds of classification methods, this paper shows a new kind of ECG automatic diagnostic system based on the CBR model and some key points on ECG database design in the CBR model.
本文在比较各种分类算法的基础上，提出了应用CBR模型建立心电图自动诊断系统的构想，并阐述了CBR模型中心电图实例库设计的若干关键问题。
A good algorithm to design such a hierarchical database consists of two steps, first, to describe real world in E-R model and then, convert it to the model supported by the DBMS.
在设计层次型数据库时，一个较好的设计方法是分二步走：首先利用实体联系方法抽象出现实世界的实体联系模型，然后将实体联系模型变换到具体DBMS 所支持的层次型模型。
The Object-Orient Data Model and the Object-Relative Database System(ORDBS) are adapted in the system structure for design and development.
系统设计采用面向对象数据模型，数据库结构采用面向对象关系数据库系统。
UML lacks, however, the sufficient management of behavior code in database, makes against tracing and extension, when using UML to design data model.
然而使用UML进行数据模型设计时，对数据库中的行为代码却缺乏有效的管理，不利于对其跟踪、扩展。
An general item bank is designed for on-line examination. According to the demands of the canonical item bank design, a relational database model is designed.
设计了一种适合于在线考试系统的通用试题数据库，根据规范数据库设计的要求，设计了试题库的关系模型。
The second method introduces how to establish dynamic database connection using ADO Object Model at program design time.
第二种方法介绍了利用ADO对象模型在程序设计阶段实现与数据库的动态连接。
In the research, the emphases are system analysis, system overall frame design, and database, model base design.
在研究中，重点进行了系统分析、系统总体结构设计和数据库、模型库的设计。
Firstly, a research of the calculation of noise prediction model based on GIS, noise impact index, as well as the database design are conducted; Secondly, VB6.
首先对基于GIS的噪声预测模型计算、噪声冲击指数计算，以及数据库设计等关键技术问题进行了研究，然后选择了VB6。
The thesis explicates the system design and its function models implementation, mainly fouces on packets capture model, data communication model and accounting database design.
本文对计费系统的设计及各功能模块的实现进行了详细的论述，重点介绍了数据包捕获模块、数据通信模块和计费数据库的设计。
Used the E-R graph tool to design the system information model, and has constructed the system database physical information model.
采用实体联系图工具设计了系统的信息模型，并构建了系统的数据库物理信息模型。
The design of the risk database, including conceptual model and logical model, was described in details.
文章对数据库的概念模型、物理模型设计工作进行了详细描述。
This article discusses a new mapped method of object model and database model, which has been employed to design an object-oriented relational database.
利用一种对象模型与数据库模型的映射方法，完成了一个面向对象的关系数据库设计。
Secondly, this paper designs vehicle management system, including system structural design, database design, functional design and object model design.
其次，本文对车管系统进行设计，包括系统体系结构设计、数据库设计、功能设计和对象模型设计。
Exploitation system in the medium - and upper-reaches of Shitou River valley includes basic information, database, stepped exploitation, model design, subsidiary decision and system management.
是本文观点和结论在具体规划中的运用。石头河中上游开发系统包括基本信息、数据库、梯级开发、模型设计、辅助决策、系统管理六大模块。
According to the deficiency of traditional E-R model in large database designing, the paper puts forward a design idea of object-oriented database based on UML.
针对传统e - R模型在大型数据库设计中的不足，提出一种基于UML的面向对象数据库设计思想。
This paper introduces the structure of system, the foundation of the database and programming design of typical model.
主要介绍该系统的结构、数据库的建立和典型模块的程序设计。
This paper introduces the structure of system, the foundation of the database and programming design of typical model.
主要介绍该系统的结构、数据库的建立和典型模块的程序设计。
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