lsp association

In my study of design patterns, I used UML for modeling.At first I was not too clear on the understanding of the various relations, on the internet also searched some information, now on the class diagram of these kinds of relationships: dependency, association, aggregation, composition, generalization, implementation of a description.First of all, we need to know two points:1. Order of their relationships: generalization = implementation > Compositio

Next, start a one-to-many-way association. Since many to one one-way association already said in (1), no longer said, the main idea is to use a one-to-many more-to-one a special form, the use of unique= "true" into a special pair to use.Description: One-to-many still use the person and address examples. In the case of a one-to-many one-way association, a person c

( references from an efficient approach for maintaining association Rules based on adjusting fp-tree Structurejia-ling Koh and Shui-feng Shieh Department of information and computer educationThere are a large number of limitations, if you want to go straight to the topic, see dry Goods, can be directly from 3, adjust Fp_tree strategy began to look at the @ouym )1 , IntroductionData mining has aroused wide attention in the research of database, because

In the last blog post hibernate from Getting started to mastering (v) One-to two-way correlation mapping We talked about one-to-one unidirectional association mappings, this time we continue to explain the correspondence of a single-way correlation mapping. Single-to-one bidirectional correlation mapping is not the same in one-to-two bidirectional associations, where there is a reference to another object (Idcard) in an object (person), but also to th

Friends who like to use Windows right-click shortcut menus 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") you choose, but whether you notice, When you install some application software, your right-click menu is not inflated, take WinZip as an example, after installing WinZip, the file or folder of the right Key menu added feature options "Add to Zip" an

It is often said that plans cannot catch up with changes. Similarly, in the project, the data used is also changing, especially the change of attribute information. For example, the figure on the map, its spatial information in a relatively long period of time, will not change, his property information in the initial incomplete or inconsistent with the information later, you can use Supermap iclient for JavaScript Association query.So how do you corre

This code can be downloaded in http://download.csdn.net/detail/fansy1990/8502323.In the previous article, the Hotspot Association rule Algorithm (1)-mining discrete data analyzes the hotspot Association rules of discrete data, and this paper analyzes the mining of the Hotspot Association rules of discrete and continuous data.1. First look at the data format (TXT

First, Hibernate's 1-n Association mapping 1. Which side is 1 and which side is more? Need to be explained from a business perspective. For example, the relationship between Employee and Department is n-1, and the relationship between Order and Customer is n-1.1). The Association relationship is directional:2). How do you build relationships in classes?Solution: You can do this by using the member variable.

MySQL latency Association Performance Optimization Method This article mainly introduces the MySQL latency Association performance optimization method. This article describes the background of latency Association, latency association analysis, and solution of latency Association