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introduce Collect coupons https://www.cps3.cn/ Do not rely on concrete implementation, but on abstraction. High-level modules should not rely on low-level modules. Both should rely on abstraction. In short, it is for better decoupling. Inversion of control (Ioc) is one of the implementation ideas of this principle. One of the implementation me ...

prefacestay "A blog with VuePress + Github Pages" In, we used VuePress to build a blog. The final effect is as follows: TypeScript Chinese document. In this article, we talk about how to be compatible with PWA.PWAPWA, full English Name: Progressive Web Apps, Chinese Translation: progressive Web applications.quote MDN Introduction to:P ...

MyBatis study notes Knowledge preparation: JDBCMysqlMavenJunit 1. Introduction 1.1. What is MyBatis? MyBatis is an excellent persistence layer framework It supports custom SQL, stored procedures, and advanced mapping. MyBatis eliminates almost all JDBC code and the work of setting parameters and obtaining result sets. MyBatis can confi ...

1, Database overview 1. Why use a database If the data is stored in a file, reading and writing occupy disk IO, and the efficiency is lowData security considerationsSupport high concurrency 2. Database classification At present, databases can be divided into two categories: relational databases and non relational databases 2.1 relation ...

At the beginning of last year, there were a lot of code written in openwrt, although I felt sorry that there was a lot of code written in openwrt in the early days of the company. Let's briefly introduce the socket multi process server on openwrt. Look at the code This is c language code. The code written at that time was not very good. Don' ...

  The principle is to use the edge detection operator to convolute the image. In image processing, convolution refers to using a convolution to check each pixel in an image for a series of operations. Common edge detection operators: Both of them contain convolution kernels in two directions, which are used to detect the edge information i ...

In the later operation and maintenance of MySQL database, DBAs sometimes encounter such a phenomenon: when troubleshooting the problem, they find that the active and standby MySQL has been switched, and it is normal to check the MySQL service. DBAs have not done the switching operation, and the server has not been maintained. Fortunately, the b ...

Haobor2.2.1 configuration (trivy scanner, image signature) Docker compose Download https://github.com/docker/compose/releases install cp docker-compose /usr/local/bin chmod +x /usr/local/bin/docker-compose harbor Download https://github.com/goharbor/harbor/releases decompression tar xf xxx.tgx Configure harbor Root establishment:m ...

Principle introduction Chow algorithm allocates bits according to the channel capacity of each subchannel. Its optimization criterion is to maximize the system margin on the premise of maintaining the target bit error rate. The algorithm allocates bits step by step through the iterative process, and gradually increases the margin of the system ...

Content introduction: Basic concepts of functions and modulesCode reuse using functionsCommon built-in modules and functions in PythonCustom functions and calls between functionsParameters and return values in functions function A function is a group of statements that are grouped together to complete an operation Benefits of using functio ...