lsp association

There two types of relationship between Classes: dependencies and associations. when we talk about one and while we forget another, this is misunderstanding caused by definition of dependency and association. normally, the definition of those terms are: Dependency: There are two classes, class A depends on class B. Class B will be affected when class A changed. Association: An

HotSpot association rule algorithm (2) -- mining continuous and discrete data and hot spot discretization This code can be downloaded at (updated tomorrow. The previous article hot spot association rule algorithm (1) -- mining discrete data analyzes the hot spot Association Rules of discrete data. This article analyzes the hot spot

ArticleDirectory Dependency Association Aggregation Combination I have never fully understood the relationship between dependency, association, aggregation, and combination. Today I saw an article which is well written. The excerpt part is shared. Full text: http://lib.360doc.com/09/0319/21/111235_2858327.shtml. Dependency It can be simply understood that a class A uses another cla

1. nested resultMapThis method is essentially the method described in the previous blog post. It just extracts the ing of the instructor entity from the association element and represents it with a resultMap element. Then the association element references the resultMap element. Modify the StudentMapper. xml in the previous blog as follows: Select s. id s_id, S. name s_name, S. gender s

This blog will bring you learning about Hibernate's relevance mapping. In real life, not only a one-on mapping relationship, more is a pair of more, many-to-many and so on.One-to-many item association mappingsHere I take the network disk for example, a user can have multiple files, and users and files are a one-to-many relationship.User entity class: Public class Users { Private intUidPrivateString uname;/ /The user uploads all files//One side can

This is a file-related issue. Such a problem is simply impossible under XP, and it seems that this particular problem is a new problem under the Win7. On the Internet, found that the problem is not just this friend, seems to have to solve the need. In order to solve this problem, we need to first talk about the basic knowledge of the file association, so that friends can know the reason why. File associations, primarily by associating file types wit

Many-to-many bidirectional association mappings In accordance with our previous practice, take a look at the relevant class diagram and code, as follows: [Java] View Plain copy print? publicclassrole{ privateintid; privateStringname; privateSetusers; publicintgetid () { return id; } publicvoidsetid ( Intid) { this.id=id; } publicstringgetname () { returnname; } publicvoidsetname (stringname) { this.name=name; } publicsetgetusers () { returnu

also known as a base class or superclass, and a subclass is also known as a derived class. In UML, the generalization relation is represented by a straight line with a hollow triangle. • When code is implemented, use an object-oriented inheritance mechanism to implement generalization relationships, such as using the extends keyword in the Java language, and using the colon ":" in c++/c#. publicclassperson { protectedstring name; protectedintage; publicvoidmove () { ...... } Publicvoidsa

/**MySQL Multi-Table Association*/One-to-one correlation such as city and area code correlation *******************First a city tableCID City Coid1 Beijing 12 Shanghai 23 Guangzhou 3One more Area code tableCoid Code1 0102 0203 0755This connects two tables together through the Association of CID and CoidSingle-to-one type his associated fields can be placed in two tables.Mysql> SELECT * from City,code where

When defining a protocol, it is useful to declare one or more association types as part of the protocol definition. An association type provides a placeholder (or alias) for a type in the protocol, and the actual type it represents is not specified until the protocol is accepted. You can specify the association type by associatedtype the keyword. For example, the

In the previous article, we discussed one-to-many mappings of unidirectional correlations, which can be implemented in one end, but there are many drawbacks, and many redundant SQL statements are generated first, because one side does not maintain the relationship, and the other side maintains it, and at the end of the operation, an extra UPDATE statement is issued. Second, because many of the end do not know that one side exists, so when you save a multi-side if the foreign key is a null value,

A one-to-one foreign key association in hibernate is similar to a Many-to-many foreign key association, Hibernate a foreign Key association first refer to this, and then just add the following code to the *.hbm.xml: is to add the unique= "true" attribute. Add the following code to the *.hbm.xml in a multiple foreign Key