java database design

Database paradigm-Easy to understand "turn" database paradigm is an essential knowledge in database design, without the understanding of the paradigm, can not design a high-efficiency, elegant database. Even

1. Data Tables with tree relationships Many programmers have encountered tree-based data during database design. For example, a common category table, that is, a large category, contains several sub-classes, some sub-classes have sub-classes. When the category is not determined, you want to add a new subclass under any category, or delete a category and all its subclasses, and the number of them is expected

Tags: Time table transaction post customer service sharing cannot SSI"The beginning of the database design classic", is now learning this book, although the previous read a similar book, may be due to previous experience, some of the book said something only digested part, now relive side understood more. So read the first time read do not understand it does not matter, after a a year to read again, or will

MySQL database design specifications and mysql design specificationsReprinted by songdeyouxiang 1. Database naming rulesIt consists of 26 English letters (case sensitive) and 0-9 Natural Numbers (not frequently needed) with an underscore;The name must be concise and clear (the name cannot exceed 30 characters );For exa

Java Design Pattern template method pattern, java Design Pattern TemplateTemplate Method Mode Defines the skeleton of an algorithm in an operation, and delays some steps to the subclass. The template method allows the subclass to redefine certain steps of an algorithm without changing the structure of an algorithm.In l

Java design mode, java design mode pdf [This article is my own learning notes. You are welcome to repost it, but please note the Source: http://blog.csdn.net/jesson20121020] The above three sections enable sorting of all types from the initial sorting of integer arrays to the final sorting of all types by defini

Abstract Factory mode of JAVA design mode and java design mode FactoryThis article continues to introduce the abstract factory model of the 23 design patterns series. We have already introduced the simple factory mode and factory method mode. Here we will continue to introdu

Java design mode: GOF Singleton mode; java design mode: gof I. Singleton)1. application scenarios of Singleton mode:① Servlet② Task Manager③ Link pool④ In Spring, each bean is a singleton by default.⑤ Website counter2. Requirements for Singleton① The constructor is private② Private Static variables③ Public static metho

These two weeks in the design of a survey database, now do a summary. Usually as a user, feel very simple a module, now participate in the design, although the feeling there are countless imperfect places, but the design time, or consider a lot of. Design of Questionnaire Mo

Java design pattern-policy pattern, java design pattern -- The rule mode is the behavior mode of the object. It is intended to encapsulate an algorithm into an independent class with a common interface for mutual replacement. The policy mode allows the algorithm to change without affecting the client. URL: http://www.c

Java design mode-singleton mode and java Design Mode View Singleton mode with questions 1. What is Singleton mode? 2. What is the use of Singleton mode? 3. How to Implement the singleton mode? /** * Hunger Mode */ Public class SingletonHungry (){ Private SingletonHungry (){} Private static SingletonHung

Java Design Pattern learning, java Design Pattern Proxy) In fact, the name of each mode indicates the role of this mode. The proxy mode is to add one more proxy class to perform some operations for the original object. For example, we go back to the intermediary when renting a house. Why? Because you do not have comp

Java design pattern: appearance pattern; java Design Pattern appearance I. Introduction The appearance mode (Facade) hides the details and complexity of internal subsystems and provides the client with the same Calling Interface, making the complex system easy to access and use. In simple terms, the appearance mode c

Discussion-static proxy in Java design mode; discussion-java Design Mode Proxy pattern: when an object does not want or cannot directly reference another object, the Proxy object can play a mediation role between the client and the target object. Static proxy is the proxy object interface required for specific implemen

Java design mode -- Singleton mode and java design mode --The Singleton mode, as its name implies, ensures that only one instance is allowed for a class in the program. This class can create a unique instance and only provide this unique instance to the system. Generally, there are five Singleton modes: Hungry, lazy, d

Java design mode-singleton mode and java Design Mode From the beginning of spring festival! I'm so drunk that I care about mountains and rivers! Every day, I am opening a new blog with two irrelevant poems! Small editors are the best in the field of code literature, and the best in the field of literature !! In any

Java program design fourth job content fifth job was released in October 9, for the third chapter all examples, java program design Question 6: What is the day of the week when the corresponding Chinese words are output based on numbers using the judgment statement? Directly Using an if statement Int weekDay = 3; If (w

Rebound height of java program design and rebound of java program design Question: How many meters does a ball fall from the height of 100 meters to half of the original height after each arrival? How high is the rebound of 10th times? Code: Public class highe {double high = 100; // The height is one hundred meters