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The fourth chapter realizes the data update of Windows program. Enumeration 1. What is an enumeration?A set of descriptive names.2. Why use enumerations?Let's say we're writing sex.int gender = 0;//0 on behalf of male= 1;//1 on behalf of women= 2;= 3

This article draws on the article of Zhang _ Bing. Thank you! In a web project, as long as a database exists, a JavaBean file will certainly exist.A JavaBean file corresponds to a table in the database, which is called by the code in Dao for data

Some constants are often used in programs. If these constants are shared, a class or interface can be defined in java to manage constants in a unified manner. Other Objects use constants from these classes or interfaces. If you need to modify

Course 1: object-oriented concept. (OOP. Object-oriented is only a supplement to process-oriented, rather than replacing process-oriented.   Class and object. Classes are abstract and objects are specific. A person is a class, and a person is an

The wizard Revisited: Dynamic crosstabs using MySQL stored procedures Since I read the excellent articleMySQL wizardryBy Giuseppe Maxia some years ago I wanted to implement crosstabs in pure mysql-and had to wait a long time until 5.0 made it

Using the relevant tool classes in hibernatetools, Java entity classes (pojo), HBM ing files, and database tables (schema) can be converted to each other. That is to say, as long as there is one of them, the other two can be obtained through various

JPA development entry instance and jpa entry instance 1. What is JPA? JPA is a Java persistence specification officially proposed by sun. It provides Java developers with an object/relationship ing tool to manage the relational data in Java

JAVA enumeration Usage Details In actual programming, there are often such "datasets", their values are stable in the program, and the elements in the "dataset" are limited. For example, seven data elements from Monday to Sunday constitute a

  Before proceeding, let's take a look at Jquery EasyUI? JQuery EasyUI is a set of jQuery-based UI plug-ins. The goal of jQuery EasyUI is to help web developers easily create a rich and beautiful UI interface. Developers do not need to write

Write an address book code in python Reference knowledge List + dict: used to temporarily store user data CPickle is used to access formatted files. Still use file for file storage Solve the Problem 1. Start to do it Original code

Objective-C learning 01-class declaration and implementation, objective-c01 Objective-C is a programming language invented by Brad Cox in early 1980. It is the same as C ++ in its generation, all of them are extended by adding object-oriented

Basic Learning day08 --- polymorphism, simple factory, Object class equals, toString, day08 --- equalsI. Polymorphism 1.1. Concept of Polymorphism  Definition: multiple forms of existence of a certain type of things. For example, cats and dogs in

Jsp tag & EL expression, jsp tag Library 1. jsp tag and el expression(1) What is a jsp tag?The jsp tag is used to replace the java code in the jsp file. After the container encounters a jsp tag, it finds the tag Class Based on the tag and then

Statement: the interview is about delayed loading. It is helpful to search for this article on the webpage. Stay here for learning! 1. Step-by-Step Query Step-by-Step query is usually used to query associated tables, such as the e-commerce platform.

When Ajax is used to send request parameters to the server, different information can be requested from the server. The same as submitting a common table, the Ajax-based request can also be divided into get and post.Use the get Method You can use

During development, you often need to process the list data retrieved from the database. the following three methods can be used to obtain the same results. I am always used to the first method. Which one is better in terms of readability and

Ext.: http://blog.csdn.net/linxingliang/article/details/52069515Spring boot uses application.properties to default a number of configurations. But what should we do when we need to add some configuration for ourselves?If you continue to add in

First, the string function1, Capitaliza first letter capital# name = ' Alex '# v = name.capitalize ()# Print (v)#2, all caps are lowercase, casefold can be transferred to many languages, lower can only be transferred to English.# name = ' AleX '# v =

? Copyright NOTICE: This article is the original blogger article, reproduced please indicate the source [TOC]1. Project structure This project uses MAVEN for project management, and it takes four steps to build a simple hibernate

Public "-//mybatis.org//dtd Mapper 3.0//en""Http://mybatis.org/dtd/mybatis-3-mapper.dtd" >NameSpace: namespace, specified as the full class name of the interfaceID: Unique identifierResulttype: Return value type#{id}: Remove the ID value from the