confluence diagram

PrefaceUML is composed of dynamic graphs and static graphs, and the state diagram is one of the most important diagrams in dynamic graphs. definitionused to describe all possible states of a particular object and the transitions between states caused by the occurrence of various events.Purposestudy the complex behavior of classes, roles, subsystems, or components.constituent elementsStatusdefinition: Refers to a condition or condition in the life cycl

For complex practical problems, there are usually dozens or even dozens or hundreds of processes on the data flow diagram. Such a data flow diagram looks unclear. The hierarchical data flow diagram can solve this problem well. System S in Figure 1.5 system processing data flow diagram Its Input and Output refl

I. Concept of database designDatabase design is the process of planning and structuring the relationship between the data entities in the database and the data entities.Two. Importance of database designIf a database does not have a good design, then after the database is complete his disadvantage is:1. Efficiency will be very low2 There are many problems when updating and retrieving data.On the contrary, a database has been well-planned, with good design, then his advantages are:1. The efficien

Through the static diagram and behavior diagram introduced in previous blogs, we can use UML to describe the static structure and dynamic behavior of a system. At this time, we have alreadyGraphical representation of the entire structure of a typical Surface-to-face object system. At this point, the software development stage has reached the implementation stage. At this time, we need the implementatio

Introduction of Timing Diagram (Brief introduction) time series diagrams (Sequence Diagram) are graphs that display the interaction between objects, which are arranged chronologically. The sequence diagram shows the sequence of message interactions between the objects participating in the interaction and their objects. The modeling elements included in the time s

The basis of software requirement analysis: the model analysis method. The structured analysis method is applicable to the demand analysis of data processing software. It provides the following modeling tools: data flow diagram, data dictionary, machine learning English language, decision table, and decision tree. The usage and method of DFD diagram are described here. DFD-Data Flow digraphs It specifies

From the above use case diagram model, we can get a general idea of what the use case diagram describes. The following is a detailed introduction. The use case diagram is used to describe what roles can do through a certain system. The use case diagram focuses on the external performance of the system, the interaction

Collaboration digoal/communication digoal is an interactive diagram that emphasizes the organizational structure between the objects that send and receive messages. A collaboration diagram shows the relationship between a series of objects and those objects, as well as the messages sent and received between objects. Objects are typically named or anonymous class instances, and can also represent instances o

Package Diagram introduction and common operations of package diagram in rational Package chart Introduction 1. Definition: group model elements and provide a namespace for the elements in the group. 2. role: it is easy to understand complex systems and control the connections between various parts of the system structure. Logically, you can modularize a complex diagram