uml entity relationship diagram tutorial

Http://www.cnblogs.com/zhaolijing/archive/2013/02/28/2936321.html UML use case diagram-detailed tutorial I. Definition of use case diagram: ByActors and Use Cases)And the relationship between themDescribe system functionsThe dynamic view of is called the use case

Overview The relationships in a UML class diagram include: Association, aggregation, composition, dependency, generalization, and Realization) Association(Association) Line representation, optional arrows, Is a relationship in a static structure, which tends to be a data relationship. The relationships in this static

relationship between a class and a class, and an inheritance relationship between an interface and an interface. Figure h1.1.6 Implementation (realization): Hollow arrow and dashed line representationThe example ( figure I) relationship specifies a contract between two entities. In other words, one entity defines one

there is no loop in the instance diagram. In other words, it can only be a one-way relationship. Figure F Synthesis (composition) Synthesis ( fig. G) is a special form of aggregation, implying "local" within the "whole" life-cycle responsibility. Synthesis is also not shared. Therefore, while the part does not necessarily have to be destroyed with the destruction of the whole, the whole is either responsib

. "When" is the answer, that is, how the development work is scheduled; 4. "Who" means that some development (or maintenance) work is intended to be done by "who? "· 5. "How" means how certain requirements are met; 6. Why? The above is the relevant content of the soft work document. Let's take a look at the relationship between the UML diagram and the document

The UML diagram and code expression of the relationship between classes and classes in java. If you need it, refer to it. There is a relationship between the class and the class: Generalization) Dependency) Association) Aggregation) 1. Generalization) Definition:Represents the inheritance

The following relationships exist between classes and classes: Generalization (generalization) Dependence (Dependency) Association (Association) Aggregation (Aggregation) I. Generalization (generalization) Definition: represents an inheritance relationship between a class and a class, an inheritance relationship between an interface and an interface, or a class's imp

is not possible to change the implementation inherited from the parent class at run time. To make things worse, the parent class usually defines at least part of the behavior of the subclass, and any changes to the parent class can affect the behavior of the child class. If the inherited implementation is not suitable for solving the new problem, the parent class must be overridden or replaced by another more appropriate class. This dependency limits flexibility and ultimately limits reusabilit

When you use Microsoft Visio to draw a use case diagram today, you find that the include relationship is not found in the Visio UML use case, which is the "arrow" + "Finally, a workable solution was found:First: Open the UML Model diagram, software and database, Microsoft vi

Er-designer provides a number of tools and features to help you create, reorganize, and customize ER diagrams, and it can also export ER diagrams in JPEG format. In this tutorial, you will learn to: Entity diagram (ERD) retrieved from the database in reverse Using table data in an ER diagram Routing Ta

The previous blog summarized the use case diagram, in which the relationship between use cases is only included, because the relationship between use cases is not particularly profound. This is also because the UML use case diagram has not passed the acceptance of the master

Reprinted: http://hi.baidu.com/dburu/blog/item/c60fc1881b37189ca4c2723f.html/cmtid/059096cb1ab0e0f352664fa7 Green UML: A uml class diagram creation tool. You can use green UML to create a UML class diagram from the Code, or use a

Http://www.cnblogs.com/gisdev/archive/2007/11/15/959843.html The use case diagram is used to analyze a system. The relationship between use cases must be considered during this period. Find the following information.Body:The use case diagram is mainly used to illustrate the main event process of the system. It is mainly used to describe the customer's needs, tha

The concepts and symbols of dependency relations dependencies represent a class that relies on other classes in some way. When two classes are in a dependency relationship, the change of one of the classes may affect another class. Symbol: The performance of dependencies in code In program code, a dependency means that an object of one class appears in the operation of another class. There are two common scenarios in which a class takes an objec

explain Entity Relationship diagram: denoted e-R diagram refers to the basic structure of data based on the three basic concepts of entity, relation and attribute, thus describing the conceptual model of static data structure. The e-R d