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Bowen Reference https://segmentfault.com/a/1190000010312601 Summary The normal operation of all business is inseparable from a safe operating environment. System security is directly related to business stability, reliability and availability. This chapter introduces some topics related to system security. Basic concepts of encryption Security ...

In the development of iOS client applications, it is often necessary to download pictures from the server. Although the system provides download tools: NSData, NSURLSession and so on, there are many factors to consider in the process of downloading pictures, such as asynchronous download, image caching, error handling, coding and decoding, and ...

Hibernate Cache Mechanism I. Role Hibernate is a persistent layer framework that frequently accesses physical databases to improve application performance by reducing the frequency of access to physical data sources.The data in the cache is a copy of the data from the physical data source, the application reads and writes data from the cac ...

This is an article I translated from a website abroad. What is Dependency Injection? For the first time, excuse me. This article is part of a series of articles on dependency injection and PHP lightweight container implementations:Part 1: What is Dependency Injection?Part 2: Do you need a Dependency Injection Container?Part 3: Introduction to ...

Knowing a problem, R recommended this online search tool, and then came down to use it, feeling good, know that Java is written, go to see the source code, lack of relevant knowledge, before and after a month or so to know its general principle, record and analysis to you, the first time no previous blog can refer to see the source code, inappr ...

Creative Patterns 1. Factory Model An interface for creating objects is defined, but subclasses determine which class to instantiate. The factory method defers instantiation of the class bar to subclasses. // Product Category public interface IProduct { } public class ProductA1 implements IProduct{} public class ProductA2 implements IProduct{} ...

Recently, I wanted to write something interesting, so I finished this simple, not very beautiful gadget. First you have to make sure that your computer has node s, and then you can do things step by step.~~ 1. Create a folder 2. Clear the current folder address bar and enter cmd.exe in the folder address bar 3. We need to download a little some ...

SELECT..FOR UPDATE has been extended in MySQL version 8.0 to implement new clauses NOWAIT and SKIP LOCKED ( WL#3597 and WL #8919 ).This is a simple try and see how it works.Finally, similar functionality in AliSQL is described below test Like the literal meaning of the new syntax, NOWAIT means that an error is returned directly when a lock cann ...

package com.atguigu.mybatis.test; import java.io.IOException; import java.io.InputStream; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Test; import com.atguigu.mybatis.bean.Emp ...

What is FTWL FTWRL is short for FLUSH TABLES WITH READ LOCK (FTWRL). This command is mainly used to ensure backup consistency. In order to achieve this goal, it needs to close all table objects, so this command is very lethal and easy to cause hang when executing the command. If it is executed in the main library, the business cannot access it ...