trigamous relationship

"Association relationship" =================================================================== Association relationship is one of the simplest and most abstract relationships between objects. It simply describes the existence of a business, conceptual logical relationship between object A and object B, but the two sides of the association do not contain the oth

The core of interactive design work is information architecture and interactive detail design. Information architecture includes classification of information and logic design of information display, and interaction details are expressed as control selection, interaction effect definition and so on. In the information design, encountered the most difficult problem is too much information and the design results are unsatisfactory, then in the premise of the need to cut off demand (too much inform

AUTOFAC supports the implicit automatic resolution of specific types to support special relationships between components and services. To take full advantage of these relationships, simply register the component, but either change the constructor parameter in the component or resolve the type in resolve () calls to use the specified relationship type. For example, when AUTOFAC injects a constructor parameter of type ienumerable (Don't worry--The follo

There are roughly 5 types of relationships between classes: 1, dependency relationship (Dependency) One-way, which indicates that one class relies on the definition of another class, where the change of one class affects the other class, and is a "use a" relationship If a depends on B, then B behaves as a local variable, method parameter, static method call, etc. public class Person {public void dosomethi

Relationship between The following example will show the relationships independently for a specific purpose. Although the syntax is correct, these examples can be further refined to include more semantics within their valid range.Dependence (Dependency) A "use" relationship between entities implies a change in the specification of an entity and may affect other instances that depend on it ( figure D). More

There are roughly 5 relationships between classes: 1, Dependencies (Dependency) One-way, which means that a class relies on the definition of another class, where a change in one class affects another class, a "use a" relationship If a depends on B, then B behaves as a local variable, method parameter, static method call, etc. public class Person {public void dosomething () {Card Card = new card ();//local variable ... } } public class Person

Original: http://blog.csdn.net/fatherican/article/details/44966891 The component thing is the noun, is the static part of the model.Behavioral things are dynamic parts that represent behavior.Grouped things are part of the organization.The annotation thing is the explanation part. Dependence: A change in one thing can cause another to change. Descriptive: Dashed + solid triangle or dashed + solid arrowAggregation: A special association that describes the combined

Example: A high-speed road has 10 entrances, each entrance can only enter 1 vehicles per second 1, please ask 1 seconds up to a few cars. Tps=10 2, how long each car needs to respond. Reponse time = 1 3, change to 20 cars, can enter several per second. How long is the response time for each car? TPS = 10,reponse time = 1 (10 are first-class, divided into two equal parts, the average TPS (10/1+10/2)/2=7.5 average response times (2+1)/2=1.5 4, the inlet expands to 20, and can be entered several

Relational calculus: based on predicate calculus in mathematical logicDifferent classification by predicate variable1. Tuple Relationship calculus:Primitive objects with tuple variables as predicate argumentsTuple Relationship Calculus Language alpha2. Domain Relational calculus:Base object with domain variable as predicate argumentDomain Relational Calculus language QBEtuple

Source: Group of technical TeamIntroductionOn some servers with physical memory of 8g, the main running of a Java service, the system memory allocation is as follows: Java service JVM heap size is set to 6g, a monitoring process consumes about 600m,linux itself uses about 800m. On the surface, the physical memory should be sufficient to use, but the actual operation is that there will be a large amount of swap (indicating that physical memory is not used enough) as shown in. At the same time, be

The order of Java class initialization is often confusing, and now this article tries to give the JVM an explanation by experimenting with the initialization order of classes in the Java non-inheritance and inheritance relationships from the JVM's point of view. initialization order in a non-inheritance relationship For non-inheritance relationships, the main class initialorderwithoutextend contains an instance of the static member variable (class var

access| Tutorials | crash | chinese Eighth. Define the relationship between tables Once you have defined the primary key and the corresponding table, you can set up a relational database by developing a relationship between the various tables. Database of application and management relationships, Chinese Access 2000 is very powerful, which is not what Chinese visual FoxPro 6 does with Chinese Excel 2000. In

Reprint: http://apps.hi.baidu.com/share/detail/11596555 Linux beginners often don't know what the relationship is between Linux and X, between x and Xfree86, X and Kde,gnome. Often confusing concepts, this paper explains the relationship between X,x11,xfree,wm,kde,gnome and so on in a relatively easy to understand way.Linux itself does not have a graphical interface, Linux is now the implementation of the

Table 1 foreign Key Table 2 Table 1 is a number of records corresponding to table 2 a record, that is, a multi-to-one use of foreign key principle we can make two tables of many-to-many, one-to-many relationship: table 1 of the multiple records can correspond to a record of table 2 Table 2, a number of records can also correspond to a record of table 1 one-to-one: table 1 is a record unique to table 2 a record, and vice versa, we first from t

from: Blog.csdn.net/lizanhong How to understand the scale class properties in VB Formsand width height properties of the relationship between The Scalehiegt,scalewidth of VB and the difference between the width,height in the form and the relation are difficult to understand by many VB beginners. I am in the process of learning Delphi has also been a similar introduction to do not know, but through the VB in these similar concepts of learning, can be s

Character encoding because the computer only recognizes 0 and 1, in order to enable the computer to support symbols such as text and letters, convenient and practical operation of the computer so that the character encoding came into being, designed to solve the symbol and human language and computer 0 and 1 to establish a correspondence relationship it is said that the character encoding may be a lifelong regret, Take it out alone. History: Ascii-->u

First, let's take a look at what is the primary foreign key?1. Primary key: Uniquely identifies a row in a data table1) There can be only one primary key in a table. If you establish a primary key on another field, the original primary key is canceled.　　In Access, although the primary key is not required, it is a good idea to set a primary key for each table. 2) The value of the primary key cannot be duplicated, nor is it null (NULL).　　The primary key is optional and can be defined in the CREATE

C++The relationship between the middle header file and the implementation file about the relationship between the two before, from N years ago~Long Longago,once aupon a time .... It was a forgotten age, in which the compiler knew only. C (. cpp)) files without knowing. h is the age of what. At that time, people wrote a lot of. C (. cpp) files, and gradually, people found that the declarations in many. C (.

1199: Size Relationship time limit: 2 Sec Memory Limit: MB Submit: 126 Solved: 27 [Submit] [Status] [Web Board] DescriptionWhen we know a set of size relationships, we can tell if all relationships can be established, that is, there is no contradiction between relationships.For example: AIf aNow that we know the M relationship, please determine whether the M

.....Directory(i) Learn the Unix Environment Advanced Programming (APUE) Standard IO(ii) Study of UNIX Environment Advanced Programming (APUE) file IO(iii) Learn about the Unix Environment Advanced Programming (APUE) files and directories(iv) Learn about the Unix Environment Advanced Programming (APUE) system data files and information(v) Learning about Unix Environment Advanced Programming (APUE) Process environment(vi) The process Control of advanced Programming (APUE) for Unix environments(vi