lsp association

We use examples to illustrate this partTable structureNow has the Customer table, the order form, the Book table, the author table, Client table customer (ID customer_name) Orders form order (ID order_name customer_id book_id) Book table (ID book_name author_id) Author table (ID author_name) Model definitionThe following is the definition of these 4 models, which only write out the associationsCustomerClass Customer extends \yii\db\activerecord{ //This is the order t

File Association and application of the Registry-Overview of registry usage II You may know that when you select a file (folder or System icon) and right-click it, a menu will pop up, you can choose all the "functions" (or "operations") on the menu, but have you noticed whether your right-click menu is expanded after you install some application software, take WinZip as an example. After WinZip is installed, the options "add to zip" and "add to xxx.zi

a construction method.The underscore indicates that this method is a static method.2. Abstract classAs shown, the difference between abstract classes and ordinary classes is that the names of abstract classes are written in italics, and abstract methods in abstract classes are italicized.3. InterfaceThe interface has the upper two methods, the first method is to add Relationship in the class diagram1. Related relationshipsAn association (

Document directory I. Multiple-to-one and one-to-Multiple Association ing (multiple users have the same group) 2. One-to-one association ing (each user has a unique group) 3. Multi-to-Multi-Association ing (each user has multiple groups and each group has multiple users) Take two simple classes as an example:User (int id, string name)Group (int id, string

manipulating Objects with association relationships The correlation relationship between data objects has a pair of one or one-to-many and many-to-many associations. In database operations, the association relationship between data objects is difficult to use with JDBC. This section explains how to handle the association between these objects in hibernate. This s

Registry file associations and applications-the registry uses the full Raiders a friend who likes to use Windows Right-click shortcut menu may know that when you select a file (or a folder or System icon) and then click the right mouse button, the system will pop up a menu, the menu above the various "functions" (or " Operation "is optional, but have you noticed that when you install some application software, your right button menu is not inflated, take WinZip as an example, after installing W

When learning object-oriented design object relationships, the differences between dependency, association, aggregation, and combination are confusing. In particular, the last three types only have differences in semantics. Semantics refers to context and specific scenarios. Their Expressions in programming languages are basically the same, but they are basically the same and not the same. This is in my previous blogRelationship between classes in Des

Since R. after Agrawal and others proposed the issue of mining association rules in 1993, many researchers have conducted a lot of research on this issue. So far, the main research directions include: multi-cycle mining algorithms (hierarchical mining algorithms) incremental update algorithm, distribution, parallel mining algorithm, multi-layer association rule mining algorithm, multi-value

Tags: hibernate summarizes original works and allows reprinting. During reprinting, you must use hyperlinks to indicate the original source, author information, and this statement. Otherwise, legal liability will be held. Http://lavasoft.blog.51cto.com/62575/39398Hibernate object link ing ---- summary spent three days of spare time, finally write all the instances of hibernate link ing, the feeling should also be summarized. The Hibernate ing relationship is complex. Can it be used in practice?

Association Rules? Item and item set The smallest unit information that is indivisible in a database is called an item (or item), represented by a symbol, and a collection of items is called an item set. Set is the set of items, the number of items in the collection is called-itemsets. For example, the collection {beer, diaper, milk powder} is a 3-item set. Transaction A set is a collection of all the items in the database,

Static and Dynamic Association of C ++Concept of Association Association refers to the process in which a computer program is associated with each other. During the association process, you must determine the operation calls (function calls) in the program and execute the operation (function).This function is implement

You may know that when you select a file, folder, or System icon, right-click the shortcut menu and a menu will pop up, you can choose among the various "functions" or "operations" on the menu, but have you noticed that after you install some application software, your right-click menu is not expanded. Take winzip as an example, after winzip is installed, the options "Add to Zip" and "Add to xxx.zip" and "Add to xxx.zip" are added to the context menu of the file or folder. Once you see this chan

First, the concept:Introduction to the basic concepts of UML:UML:UML (Unified Modeling Language) provides a unified, standard, and visual modeling language for object-oriented software design. It is suitable for describing the whole process of software design which is driven by use case and is architecture-centric.UML Model Diagram is composed of things, relationships and graphs.1. Things:Things are: Component things "class, interface, use case, component, node, etc." Behavior things "interactio

Development Guide | data A data Table association is a logical relationship between records in two or more data tables. For example: Every citizen has an ID number. Each author has written many (0-n) books, and each book has multiple (1-n) authors Each article has multiple (0-n) reviews Every comment belongs to an article Currently, fleaphp supports four types of data table associations, respectively: Has_one: each record in t