MySQL8.0安装与使用

Windows：

　　1.下载：https://dev.mysql.com/downloads/mysql/

               推荐使用镜像：http://mirrors.sohu.com/mysql/MySQL-8.0/

　　2.下载完成之后， 解压到目录下，例如：D:mysql-8.0.22-winx64

　　3. 设置环境变量

　　　　变量名称：MYSQL_HOME

　　　　变量值：D:mysql-8.0.22-winx64

　　4. 生成data目录

          注意： 以管理员身份运行cmd

　　进入到bin目录下D:mysql-8.0.22-winx64in

       执行命令：

mysqld --initialize-insecure --user=mysql

　　则会在bin目录的同级生成data目录

　　5. 安装MySQL

 　　

mysqld  -install

　　6. 启动服务

net start MySQL

　　7. 登录MySQL

mysql  -u root -p

//默认没有设置密码， 直接回车即可

　　8）查询用户密码

select host,user,authentication_string from mysql.user

　　9）密码修改

use mysql;



ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

flush privileges;

　　10）再次登录

　　11）mysql配置

            默认mysql8.0是data目录中是不存在my.ini配置文件的，如有需要新建即可 

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_bin
init_connect='SET NAMES utf8mb4'
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
# These are commonly set, remove the # and set as required.
basedir = D:mysql-8.0.22-winx64
datadir = D:mysql-8.0.22-winx64data
port = 3306
# server_id = .....
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
join_buffer_size = 128M
sort_buffer_size = 16M
read_rnd_buffer_size = 16M 
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

        设置完成之后， 可以设置mysql默认的配置文件

mysqld --defaults-file="D:mysql-8.0.22-winx64datamy.ini"

　　然后重启服务即可， 如果你在开始安装的时候已经创建了配置文件，可以在安装的时候直接指定即可

mysqld --install "MySql80" --defaults-file="C:installmysqlmysql-8.0.16-winx64my.ini"

其他相关命令：

　　1. 停止MySQL服务

net stop  mysql