• Solve the problem that BitLocker repeatedly prompts that the recovery key is correct and cannot enter the system


    A while ago, because grub was installed on the computer, the boot strategy was changed. To open windows, you need to enter a recovery key for recovery. I have logged into a Microsoft account, so I found the key on the official website and recovered the drive. But when you go in and prompt “the […]

  • Analysis of JDBC


    Design concept of JDBC JDBC is one of the standard specifications of J2EE. J2EE is a series of specifications for Java to solve enterprise application development, and JDBC is no exceptionJDBC is a standard Java API for connecting database with Java programming language, which has nothing to do with specific database and its underlying implementation […]

  • MacBook M1 Big Sur install Valet run yii2


    preparation Suppose you have installed brew / composer / PHP locally Check environment variables $echo $PATH | grep composer #If not, add an environment variable $export PATH=~/.composer/vendor/bin:$PATH #Check it out $echo $PATH | grep composer /Users/yourname/.composer/vendor/bin: Global installation of Valet $composer global require laravel/valet Changed current directory to /Users/yuanjian/.composer Using version ^2.14 for laravel/valet ./composer.json […]

  • Spark Machine Learning 01 Spark Use @Scala、Python


    Preface Apache Spark It simplifies the process of mass data storage (HDFS) and computation (MR — a framework for parallel computation in multiple nodes of cluster). MapReduce has some disadvantages, such as high overhead when starting tasks and dependence on writing intermediate data and computation results to disk. This makes Hadoop unsuitableIterativeorLow latencyIt’s our mission. […]

  • USB not recognized? Simple and detailed driver installation tutorial!


    Link to the original text:https://xiaoheidiannao.com/articles/Driver-Program.html catalog introduce Install driver introduce Device driver (device driver) for short, is a kind of device driver that can make theoperating systemandHardwareThe special program for data interaction between devices isoperating systemandHardwareThe interface between,operating systemOnly through this interface can we control itHardwareThe work of the equipment, if aHardwareThe driver for is […]

  • Unknown system variable ‘query_ cache_ size’


    Start project idea error: java.sql.SQLException: Unknown system variable ‘query_cache_size’ The reason is that the database driver does not correspond to the database versionterms of settlement: _ For example, mybatis uses the driver of mysql-5.1.14, and the data source configured by mybatis is connected to mysql-8.0.11. Modify the POM file as follows: <dependency>     <groupId>mysql</groupId>     <artifactId>mysql-connector-java</artifactId>     <version>8.0.11</version> […]

  • Rust client driver for mainstream database and NoSQL


    A series of articles: awesome rust Mongodb officially released mongodb rust driver Rust organization on GitHub Learn rust through examples Rust implementation of common algorithms Lightweight Windows GUI tool library based on Rust Chinese English comparison of rust language terms Official weekly diary of rust Small and fast rust asynchronous runtime SMOL Microsoft open source […]

  • View the batch of drives (drive letters)


    Copy codeThe code is as follows: @echo off setlocal enabledelayedexpansion for /f “skip=1 tokens=1,2 delims=\” %%a in (‘fsutil fsinfo drives^|find /v “”‘) do ( set aa=%%a set aa=!aa:~-2! for %%i in (!aa!) do fsutil fsinfo drivetype %%i ) pause

  • What is cargo


    A series of articles: Rust has questions and answers What is cargo Rust has questions and answers What is toml in rust Q & A What can we learn from HelloWorld Cargo: build tool and package manager of rust The title of the article is from the official website of rust Introduction to rust programming […]

  • Management of Mayberry town three distinct leadership styles 3M


    ? 2001, 2014 don gray and Dan Starr Near the Blue Ridge Mountains in North Carolina, not far from where you should think, there is a small town called Mayberry. Although the main road bypassed the town a few years ago, Mayberry is the name of the popular 1960s TV series, and it’s still a […]

  • Install docker for CentOS


    Environment: Linux centos8 4.18.0-80.el8.x86_ 64、docker-19.03.5 1. Preconditions Requires OS kernel 3.10+ Uname – R // view the operating system version number 2. Check if it is installed (uninstalled) yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine You can also uninstall in the following ways: *Yum list […]