what inheritance in database

Model inheritance in Django and DjangoModel inheritance The model inheritance in Django is very similar to the class inheritance in Python, but you need to select a specific implementation method: to make the parent model have an independent

Reading Notes Objective C ++ Item 40 wise and careful use of multiple inheritance, too tiveitem1. Two camps inherited from each other When we talk about multi-inheritance (MI), the C ++ committee is divided into two basic camps. One camp believes

Reading Notes Objective c ++ Item 39 use private inheritance wisely and cautiously, using tiveprivate1. Introduction to private inheritance Item 32 indicates that C ++ treats public inheritance as a "is-a" relationship. Consider an inheritance

Original link: http://www.cnblogs.com/shuhari/archive/2009/06/04/inherit_thinking.htmlIs it good to inherit?The classical oo theory says: Inheritance is one of the three cornerstones of object-oriented.Modern OO theory says that the combination is

The model inheritance in Django is very similar to the class inheritance in Python, but you need to select a specific implementation method: to make the parent model have an independent database, or to make the parent Model contain only basic public

See Mountain is only the mountain see water is only water--raise the understanding of inheritance Author: Wen Yu This article is published in the "Csdn Development master" Encapsulation, inheritance and polymorphism are three

Variable attribute requirements: We need to store a lot of appliances in the database, such as TV, refrigerator and so on. Typically, in a program, our class diagram is:Eva DesignOne way to do this kind of inherited mutable property is to create

Object-Oriented Programming has four main features: abstraction, encapsulation, inheritance and polymorphism.   1.1 concepts of inheritance and Derivation In C ++, reusability is achieved through the mechanism of inheritance. Inheritance is a only

The whole solution of inheritance relation mapping in ORM--single table inheritance system, one entity one concrete table, one Entity one extension table, interface mapping This article covers the following topics: 1. Single-Table inheritance

What is private inheritance? When I was studying at school, I had never studied such a thing carefully. Later, I used the boost library in my work to learn about it. If we say that most inheritance protection is for language integrity, private