Mysql的下载与安装

一、MySQL的下载

下载地址：https://dev.mysql.com/downloads/mysql/

 下载的文件：

二、MySQL安装和配置

 解压，zip格式解压缩之后其实MySQL就可以使用了，但是要进行环境变量配置

我的电脑->属性->高级系统设置->环境变量，选择Path,在其后面添加: 你的mysql bin文件夹的路径 ：D:installmysql-8.0.26-winx64in

 配置完环境变量之后，在D:installmysql-8.0.26-winx64目录下新增加一个配置文件my.ini ，同时在bin的同级目录下创建一个data文件夹（用于存放数据库数据）

[client]
# 设置mysql客户端默认字符集
default-character-set=utf8
 
[mysqld]
# 设置3306端口
port = 3306
# 设置mysql的安装目录
basedir=D:installmysql-8.0.26-winx64
# 设置 mysql数据库的数据的存放目录，MySQL 8+ 不需要以下配置，系统自己生成即可，否则有可能报错
datadir=D:installmysql-8.0.26-winx64data
# 允许最大连接数
max_connections=200
# 服务端使用的字符集默认为8比特编码的latin1字符集
character-set-server=utf8
# 创建新表时将使用的默认存储引擎
default-storage-engine=INNODB

 以管理员身份打开 cmd 命令行工具，即我们在Windows10系统的搜索框中直接输入命令CMD。在命令提示符上单击右键，选择管理员身份运行。切换目录：D:installmysql-8.0.26-winx64in

初始化数据库：

mysqld --initialize --console

执行完成后，会输出 root 用户的初始默认密码，如：

D:installmysql-8.0.26-winx64in>mysqld --initialize --console
2021-10-03T15:13:48.329496Z 0 [System] [MY-013169] [Server] D:installmysql-8.0.26-winx64inmysqld.exe (mysqld 8.0.26) initializing of server in progress as process 5380
2021-10-03T15:13:48.330236Z 0 [Warning] [MY-013242] [Server] --character-set-server: 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
2021-10-03T15:13:48.412807Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2021-10-03T15:13:48.905376Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2021-10-03T15:13:49.965476Z 0 [Warning] [MY-013746] [Server] A deprecated TLS version TLSv1 is enabled for channel mysql_main
2021-10-03T15:13:49.966392Z 0 [Warning] [MY-013746] [Server] A deprecated TLS version TLSv1.1 is enabled for channel mysql_main
2021-10-03T15:13:50.060809Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: MPs)*UFna2dw

MPs)*UFna2dw就是初始密码，后续登录需要用到，你也可以在登陆后修改密码。

输入以下安装命令：

mysqld install

启动输入以下命令即可：

net start mysql

结果如下：

D:installmysql-8.0.26-winx64in>mysqld install
Service successfully installed.

D:installmysql-8.0.26-winx64in>net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。


D:installmysql-8.0.26-winx64in>

 修改密码：alter user user() identified by '密码';

mysql> alter user user() identified by '123456';
Query OK, 0 rows affected (0.02 sec)

在cmd中访问MySQL服务：

C:Usersmiracle>mysql -u root -p
Enter password: ******
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 12
Server version: 8.0.26 MySQL Community Server - GPL

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.02 sec)

mysql>