uml entity relationship diagram

！！！ Excerpt from: http://www.cnblogs.com/silent2012/archive/2011/09/07/2169946.htmlSeveral structure http://www.open-open.com/lib/view/open1328059700311.html in class diagram1. What is a class diagramClass diagram are mainly used to describe the structural design of a system. Class diagrams are also the most commonly used UML diagrams, with class diagrams showing classes, interfaces, and the static structur

closely linked.The subsystem in UML uses a rectangular border to represent a subsystem that can write a description of some of the systems: (5) Relationship A relationship is a relationship between a participant and a participant, a use case and a use case, a use case and a participant, usually divided into four types

The meanings of the symbols of UML class diagramsClass diagram basic symbols can be broken down into dashed lines, arrows, solid lines, hollow right triangles, solid right triangles, hollow diamonds and solid diamonds. These basic graphs are combined to form the basic symbols of the class diagram. It is important to note that the order of these symbols represents

UML class diagram Using UML class diagrams, we can express the static content of classes and their relationships. In the class diagram, we can show the member variables and member functions of the class, as well as the inheritance and reference relationships between classes. In short, we can depict all source code-leve

compositing relationship is a strong "ownership" relationship, which reflects the strict relationship between the parts and the whole, and is the same as the overall life cycle. Here, birds and their wings form a synthetic relationship because they are partially related to the whole, and the life cycles of wings and b

other (both attributes of the two classes have the other) Class B associates Class A (Class B has an object whose property A is) Class A is associated with Class B (Class A has the attribute BS as set, and set contains the objects of Class B) A and B are 1-to-n (n> 0) associations. 3.3 aggregation relationship It is known that the wheel class plays the role of wheels and aggregates four to the car object. The hollow diamond in the

is associated with project that needs to be converted.(ii) Conversion of the set-up component into a model diagramCheck the set component, right click, Update Model ..., will pop up the confirmation dialog box, select the class to be converted, click Finish.Comments①IBM Rational Software Architect is an integrated design and development tool that enables users to develop clearly structured applications and services in a UML model-driven development a

Use case diagram (Use Case daigrams) The Use Case view of UML is the view of the external feature description of software products. It describes the demand for software products from the user's perspective rather than the developer's width, and analyzes the functions and dynamic behavior required by the product. The use case diagram in

In software systems, classes do not exist in isolation, there are various relationships between classes and classes, and UML provides different representations for different types of relationships.1. Related relationshipsAn Association (association) relationship is the most common relationship between a class and a class, and it is a structured

in Java. The difference between Association and aggregation is purely conceptual and strictly reflected in semantics. Aggregation also implies that there is no loop in the instance diagram. In other words, it can only be a unidirectional link. Figure F Composition) Synthesize (Figure G) Is a special form of aggregation, suggesting that "local" is responsible for the lifetime of the "whole. Synthesis is not shared. Therefore, although local data may

The existence of UML time series diagramIn the previous article, the UML class diagram was recorded, and the class diagram was used to describe the classes needed in the code and the relationship between them, and the whole program framework was displayed in front of us, lik

One. UML OverviewThe role of 1.UML: a complex problem decomposition B realizes the visualizationUML is created by rational company 2.UML is what: is a language, has its own standard expression rules, is an analytical design language, is also a modeling language 3.UML including five large views, 13 kinds of Figure five

transferred from: http://www.cnblogs.com/silent2012/archive/2011/09/07/2169946.html1. What is a class diagramClass diagram are mainly used to describe the structural design of a system. Class diagrams are also the most commonly used UML diagrams, with class diagrams showing classes, interfaces, and the static structure and relationships between them.2. Elements of a class diagramThe following model elements

The relationships in UML are hard to remember. Here I will summarize and briefly introduce the commonly used relationships in UML. Note: The sample image is drawn using EA 7.5. Five basic relationships of UML (class diagram as an example) Association Link elements and instances, and connect two model elements with no

, the Association and the aggregation cannot distinguish syntactically, must examine the concrete logical relation. "Code embodiment": member variable "Arrows and points": solid lines with hollow diamonds, diamonds pointing to the whole 5. Combination (composition) "Combinatorial relationship": the relationship between the whole and the part, but part cannot leave the whole and exist alone. If the company

After reading the UML video, I want to start drawing documents. I don't know how to start! Let's summarize the nine types of diagrams and relationships in UML, and then start with the document. First. The nine types of UML diagrams are: use case diagram, class diagram, obj

The object class diagram of UML can be better usedDatabaseModeling. Traditional E-R diagram only focus on data, while UML object class diagram not only on the data, but also on the behavior modeling, these behavior in the physical database is designed as a trigger and storag

team and the team (as shown in ). The "employee" and "employer" on the two sides of the Association indicate the relationship between the two, while the number indicates the restriction of the relationship between the two, which is the multiple correlation between the two. There are usually "*" (indicating all, not limited), "1" (indicating there is only one), "0... "(0 or more)," 0, 1 "(0 or one)," n...

category passed to the operation database. In order to improve system scalability, different data category classes may be required for different databases. Therefore, a data category interface, such as iuserdao, is provided, each specific data category is an implementation class of a data category interface. For example, oracleuserdao is a data category dedicated to accessing Oracle databases. Draw a class chart based on the preceding description. To simplify the class

ErFigure: Entity-Contact Diagram(Entity-relation di.pdf)Used to create a data model,This is a conceptual design stage in the introduction to database systems,ErA graph provides a method to represent entities (that is, data objects), attributes, and associations. It is used to describe the conceptual model of the real world. CompositionE-RThe basic elements of