object oriented database software

class.Use:Dependencies between modules occur through abstraction, and there is no direct dependency between classes, and their dependencies are generated through interfaces or abstract classes.To put it simply: interface-oriented (interface or abstract class) programming, or for abstract programming.Example code:Five, the system has higher flexibility: the principle of interface isolationEnglish name: Interfacesegregation Principle (ISP)The first def

designs in which you can define a subclass and combine his instances with existing instances to introduce custom functionality.Design mode: Bridge, Chain of Responsibility, Composite, Decorator, Observer, strategy.8. Unable to easily modify the classSometimes you have to change a class that is difficult to modify. Maybe you need the source code without it (this is the case for a business class library), or any change to the class might require modifying many other subclasses that already exist.

information;State diagram is a graphical method for expressing the process of object state transformation;An event trace diagram expresses all the events that may occur between an object and an object, and a graphical method of listing all events in chronological order of occurrence.The dynamic model is mainly composed of state diagram and event tracking graph.

main program body code of the main package requires a long Compilation Time, or the SCP and notice packages are provided in the form of a shared library or DLL, the preceding modifications are necessary. Otherwise, if the program size is small and the compilation time required by the main code of the program can be ignored, the modifications are not required. After all, the modified program structure adds an abstract layer, which increases complexity. Design principles and patterns

I started to learn the design model and posted "design patterns can reuse the basis of object-oriented software" on the Internet. After reading the introduction, I found that I have written so many self-satisfied code before, however, from the perspective of the design model, it's all Spam !! It seems that it is necessary to charge well. The journey of a thousand

This chapter mainly discusses object-oriented analysis, from the concept of analysis, identification and analysis of the class, the definition of interactive behavior, the establishment of analysis of the class diagram and evaluation of the mode of analysis of several aspects of the narrative. The object-oriented analy

. Building the corresponding number of prototypes and cloning them may be more convenient than manually instantiating the class each time you use the appropriate state.6. Singleton single Piece6.1 Intent: Ensure that a class has only one instance and provides a global access point to access it.6.2 The pattern can be used in the following cases:1) When a class can have only one instance and the customer can access it from a well-known access point.2) When this unique instance should be extensible

Ten principles of Object Oriented Software development (turn two) When you define the parameters of a method, be sure to make them extensible. For example, the following line of code is not extensible: Public Function PlaceOrder (slastname As String, Sfirstname as String, saddress as String) To invoke this method you must pass these 3 parameters. But if you

/projects/structuremap/files/Ninject:http://ninject.org/downloadUsing the existing broad application framework above, spring.net originates from Java's Spring, is more complete and powerful, AUTOFAC and Ninject are more clear and friendly, personal recommendation use autofac+ other framework combination.4, interface Isolation principleRequirements: Use a dedicated small interface as much as possible, rather than the total interface, to avoid complex interfaces.5, the Richter replacement principl

Architecture of object-oriented software requirements Here, we need a specific way of thinking and a unique methodology. It is necessary to correctly understand and properly use the classical demand analysis theory.1. establish a system's overall framework as soon as possible in terms of ideological methods, and generally locate the positions of various specific

Review:Inheritance: Is the relationship between classes and classes, and what is a relationship of whatThe purpose of inheritance is to solve code reuse problems and reduce code redundancyInheritance is to inherit the attributes of the parent class to the subclass.Derivation is a subclass that derives its own new propertyclassteacher:def __init__ (self,name,age,sex,salary,level): Self.name=name Self.age=Age Self.sex=Sex self.salary=Salary Self.level=Level def walk (self): print ('%s is walking'%

(I saw an article about the relationship between object-oriented design and database design. I think it is very good. I will post it again .) There is no data stream in object-oriented systems. The business is completed by objects and messages. There is only "

database engine that can work on devices, mobile products, desktops, and servers in a variety of platforms. The main features are as follows: Open Source mode. Unlike other Odbms, db4o is open source software that drives the development of db4o products through the power of the open source community. native database. db4o is a 100% native