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1. Why divide tables?The database data becomes larger and larger, with too much data in a single table.This results in slower queries and database performance bottlenecks due to the lock mechanism of tables, which can seriously affect application operations.One mechanism in mysql is table and row locking to ensure data integrity.A table lock m ...

1 General Visitor pattern is a behavior pattern, which is not commonly used. It can separate the algorithmic logic acting on the object from the object itself. 2 visitor mode When we need to operate on a group of similar types of objects, we can maintain the operation logic within each object separately, but this violates the principle of singl ...

LINQ in C ා provides two operation modes: query expression and query operator. All query expressions are replaced by corresponding query operator classes. Query expression is a bit of "class" SQL. When writing SQL in the code, I always feel that it is not "elegant". Using query operators is "elegant". This series i ...

functional requirement 1. Picture to base64 2.base 64 to binary array 3. Save binary data to file and download to local resolvent Question 1: reference material vue element upload picture to base64 Specific code getBase64(file) { return new Promise(function (resolve, reject) { let reader = new FileReader(); let imgResu ...

Yunqi information:[ Click to see more industry information]Here you can find the first-hand cloud information of different industries. What are you waiting for? Come on! As a rookie in JavaScript type checker, Hegel aspires to be the best JavaScript static type checker. It claims to provide a reliable type system with strong type inference. At ...

I always think that learning c + + is too complex, and there are many types in it, which are too many to distinguish at all. However, most of the online materials are c + +, and some problems are not solved perfectly with other methods (can be used in c, java, python) Then I decided to do it. Because I had to do c + +, I had to do VC + +, and ...

Problem scenarios We use Suricata for traffic analysis. Suricata is deployed on a 48-core physical machine with a multi-network card. Due to business needs, suricata's network card for monitoring traffic has been upgraded from 5 to 6, enp176s0f1 has been added, and several similar errors have been found in suricata's log: <Error> - [ERRC ...

  1. Before using the methods of arrays, you need to create arrays, which can be created in the following ways: Literal Quantity (json) var arr1 = []; //Create an empty array var arr2 = [5]; //Create an array with a single element var arr3 = [5,6,7]; //Create an array with multiple element ...

preface This article mainly analyzes the flow of the createBean() method of Spring IoC and the bean life cycle. Here is a general flow chart: text AbstractAutowireCapableBeanFactory#createBean @Override protected Object createBean(String beanName, RootBeanDefinition mbd, @Nullable Object[] args) throws BeanCreationException { if ( ...

1, Handler mechanism and ThreadLocal In the Handler mechanism, we will encounter a very important class in Looper: ThreadLocal, ThreadLocal is not a thread, its function is to store data in each thread. When the handler is created, it will get the Looper of the current thread to construct the message loop system. The way to get it is through ...