uml entity relationship diagram

The first is to review the UML in the understanding of nine kinds of diagrams: http://xhf123456789plain.blog.163.com/blog/static/172880482201192222144421/Picture use case diagram: http://xhf123456789plain.blog.163.com/blog/static/172880482201192221826110/The following is an example of a class diagram (as if it were in a big talk design):Class

Source: http://bbs.csdn.net/topics/300192417There are three main types of classes in UML: Boundary classes, control classes, and entity classes. The concept of introducing boundary classes, control classes, and entity classes helps analysis and designers determine the classes in the system.Boundary classes are located at the junction of the system with the outsid

association. It is a stronger link than an aggregation relationship, also known as forced aggregation. It also reflects the relationship between the whole and the part, however, at this time, the entire and part of the lifecycle cannot be divided. The end of the overall lifecycle means that part of the lifecycle ends. For example, the relationship between the co

Case modeling is a part of UML modeling and the most basic part of UML. The main function of case modeling is to express the functional requirements or behaviors of the system. To put it bluntly, it is to explain what the system is, so you don't have to worry about how to work. I think the use case chart is the best picture in the analysis phase, because the content is very macro. Understand the elemen

In a UML diagram, there are several common relationships: generalization, implementation, association, aggregation, and composition ), dependency) 1. Generalization) [Generalized relationship]: an inherited relationship that represents a general and special relationship. It

A class chart is a type of static view. A class chart describes a static relationship. In my opinion, a class chart is a process of finding and drawing relationships. It is so difficult to find a class in this process. The following figure shows the elements in the class diagram: AboutUMLOfArticleIt is summarized after all the images are drawn.,Let's look back at the class

Original address: http://blog.csdn.net/zhuojiajin/article/details/8657853See the UML video, feel the UML content actually look very clear. When I started to paint, I found out that it was purely a teacher's job. Listen to understand or feel that you understand that it is just an illusion. For the UML diagram or underst

The "activity diagram" displays business or software processes as workflows through a series of operations. These operations can be performed by people, software components, or computers.The activity diagram can be used to describe various types of processes. The specific examples are as follows:Business flow or workflow between the user and your system. For more information, see user requirement modeling.T

the OO principle, we need to put forward the name attribute separately, and then let other classes inherit. Next let's take a look at the generated code to see if it is exactly the same as the class diagram description. (double-click) any class diagram. Hey, is it a little interesting. Well, we have mastered the class graph 20% so far. You only need to practice more. Of course, you may think the

part and the whole, and the same as the overall life cycle. As shown in Figure 9, the wings of a bird and a bird are a combination (synthetic) relationship. They are the relationship between the part and the whole, and the wings and the life cycle of a bird are the same. The compositing relationship is expressed by solid diamond and solid arrows. There is a numb

Unified Modeling Language (UML. It includes the following important functions: Visualizing) Specifying) Construting) Document creation (documenting) UML includes: User case diagrams) Class Diagrams) Sequence Diagram (sequence diagrams) Collaboration diagrams) Activity diagram (activitiy diagrams) Component

initiated by the participant.(5) Generalization. Generalization is the same as the generalization concept in a class, where the child use case inherits the behavior and meaning of the parent use case, and can also increase or overwrite the behavior of the parent use case, and the child use case can appear where any parent use case occurs (both parent and child have concrete instances). Here are two illustrations illustrating the concept and meaning of generalization (meaning inheritance and beh

First, the concept: Introduction to the basic concepts of UML: UML:UML (Unified Modeling Language) provides a unified, standard, and visual modeling language for object-oriented software design. It is suitable for describing the whole process of software design which is driven by use case and is architecture-centric. StarUML Use tutorial See http://blog.csdn.net/monkey_d_meng/article/details/5995610/ UML M