Programmer Think

brief introduction   I believe that the biggest motivation for many people to learn distributed locks is not their own system needs, but the needs of interviewers... Of course, this also shows that the distribution lock is very important. It is often used as an examination question. Before learning, we need to clarify several questions. ...

In the process of writing this article, we refer to the content of the course "Introduction to Python Programming and data science" by Mr. Hu Junfeng. Concept: Multiple tasks should be carried out simultaneously at one time, but not necessarily at the same time.Parallel: promote multiple tasks at the same time in a period of time, a ...

Zero. Learning objectives of this lecture Understand the meaning of bit operationMaster the use of bit operation 1, Bit operator concept Bit operators are symbols that operate on each bit of binary numbers. They operate specifically on numbers 0 and 1. 2, Bitwise operator usage (1) Classification description table operatoroperationexa ...

The test environment built this time: PHP (5.5-7.0) + Apache (> 2.0) + MySQL 5 7 (Architecture) → Windows/Linux The first step is to install the basic software through yum Installation method: directly use after decompression; rpm file installation; yum online installation; There is no need to configure the yum source here, becaus ...

Primary directory Secondary directory Tertiary directory 1. Pipeline 1. Anonymous pipeline Anonymous pipes communicate with blood related processes Anonymous pipeline communication steps: 1. A process opens the same file in read-write mode respectively, so there are two file descriptors, one pointing to the file in read mode and th ...

Mybatis personal summary notes 01 basic information Mybatis is the SQL mapping frameworkThis object can be mapped into a row of data in the databaseDevelopers only need to provide sql, process sql through Mybatis, and finally get the List collection or Java objectsMybatis is a semi-automatic ORM mapping tool, which is called semi-automa ...

Which course does this assignment belong to< software engineering practice spring 2022 - class F >What are the requirements for this assignment< the second assignment of software engineering practice - personal practice >The goal of this assignment< complete the crawling of the event data of the Winter Olympic Games (for teaching ...

1, The blue bridge cup test questions are divided into candy [the fifth session], [provincial competition], [group B] (1) Problem description Time limit: 1.0s memory limit: 256.0MB There are n children sitting in a circle. The teacher gives each child an even number of sweets at random, and then plays the following game: Each child gave ha ...

catalogue preface Fixed window algorithm Sliding window algorithm realization use conclusion   preface In the actual project, in order to ensure the stable operation of the server, it is necessary to limit the access frequency of the interface to avoid excessive pressure on the server due to frequent requests from the client. AspNe ...

This note is the learning content of Alibaba cloud Tianchi Longzhu program SQL training camp. The link is: https://tianchi.aliyun.com/specials/promotion/aicampsql； Basis of select statement SELECT statement The basic SELECT statement contains two clause s, SELECT and FROM. Examples are as follows: SELECT <Listing>, FROM <Table na ...