一，下载MySQL免安装版

去官网下载免安装压缩文件：

• 所谓免安装版就是一个压缩文件，解压缩后并简单配置就能使用MySQL服务，比以前的多步骤安装版在安装时方便很多。

我这里是下载到D:\tools_software\mysql目录下面，然后解压缩：

二，创建并配置 my.ini 文件

在 bin 同级目录创建一个data文件夹。

同时在同级目录创建 my.ini 文件：

然后打开文件填写以下内容：

[mysql]
# 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:\\tools_software\mysql\mysql-8.0.23-winx64
# 设置mysql数据库的数据的存放目录
datadir=D:\\tools_software\mysql\mysql-8.0.23-winx64\data
# 允许最大连接数
max_connections=200
# 允许连接失败的次数。这是为了防止有人从该主机试图攻击数据库系统
max_connect_errors=20
# 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

• 这里千万要注意所填写的两个目录的格式！

如果你是按上图方式复制的目录地址到ini文件中，记得要按上面配置中那样稍加修改！否则可能会导致后面初始化阶段出问题：

D:\tools_software\mysql\mysql-8.0.23-winx64\bin>mysqld –initialize –console
mysqld: Can’t create/write to file ‘D: ools_software\mysql\mysql-8.0.23-winx64\data\is_writable’ (OS errno 2 – No such file or directory)
2021-03-21T05:18:47.055720Z 0 [System] [MY-013169] [Server] D:\tools_software\mysql\mysql-8.0.23-winx64\bin\mysqld.exe (mysqld 8.0.23) initializing of server in progress as process 14892
2021-03-21T05:18:47.055765Z 0 [ERROR] [MY-010338] [Server] Can’t find error-message file ‘D:\tools_software\mysql\mysql-8.0.23-winx64\bin\ ools_software\mysql\mysql-8.0.23-winx64\share\errmsg.sys’. Check error-message file location and ‘lc-messages-dir’ configuration directive.
2021-03-21T05:18:47.056089Z 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.
2021-03-21T05:18:47.057690Z 0 [ERROR] [MY-010460] [Server] –initialize specified but the data directory exists and is not writable. Aborting.
2021-03-21T05:18:47.057700Z 0 [ERROR] [MY-013236] [Server] The designated data directory D: ools_software\mysql\mysql-8.0.23-winx64\data\ is unusable. You can remove all files that the server added to it.
2021-03-21T05:18:47.075881Z 0 [ERROR] [MY-010119] [Server] Aborting
2021-03-21T05:18:47.076832Z 0 [System] [MY-010910] [Server] D:\tools_software\mysql\mysql-8.0.23-winx64\bin\mysqld.exe: Shutdown complete (mysqld 8.0.23) MySQL Community Server – GPL.

三，初始化MySQL

接下来的所有操作都需要在以管理员身份打开的 cmd 中进行。

直接初始化：

mysqld --initialize --console

结果如下：

mysqld –initialize –console
2021-03-21T05:22:06.303690Z 0 [System] [MY-013169] [Server] D:\tools_software\mysql\mysql-8.0.23-winx64\bin\mysqld.exe (mysqld 8.0.23) initializing of server in progress as process 15492
2021-03-21T05:22:06.304459Z 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.
2021-03-21T05:22:06.319102Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2021-03-21T05:22:12.696228Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2021-03-21T05:22:23.225082Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: d;aa/-PgJ85)

• 保存一下最后一行的 d;aa/-PgJ85) 它是初始化生成的初始化密码！

四，启动MySQL服务

首先需要安装MySQL服务：

mysqld --install mysql8

• mysql8自定义的服务名

结果如下：

mysqld –install mysql8
Service successfully installed.

然后启动MySQL服务：

net start mysql8

结果如下：

net start mysql8
mysql8 服务正在启动 …
mysql8 服务已经启动成功。

五，登录并修改密码

启动MySQL服务后使用 root 身份以及之前保存的初始化密码进行登录：

mysql -uroot -pd;aa/-PgJ85)

进入MySQL，结果如下：

mysql -uroot -pd;jQ/-AaJ85)
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.23
Copyright © 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>

再修改密码并刷新：

mysql> alter user 'root'@'localhost' IDENTIFIED BY 'yourpassword';
mysql> flush privileges;

结果如下：

mysql> alter user ‘root’@‘localhost’ IDENTIFIED BY ‘yourpassword’;
Query OK, 0 rows affected (0.17 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.11 sec)

六，配置环境变量

按照网上一些教程，在正式初始化MySQL之前就需要配置环境变量，但我多次重复试验后会在初始化步骤中报错（我也不明白为什么）：

‘mysql’ 不是内部或外部命令，也不是可运行的程序或批处理文件。

所以我这里在能启动MySQL服务之后再配置环境变量：

然后就能在cmd的任意位置启动MySQL服务而不需要再进入D:\tools_software\mysql\mysql-8.0.23-winx64\bin进行启动

结果如下：

D:\tools_software\mysql\mysql-8.0.23-winx64\bin>cd \
D:>net stop mysql8
mysql8 服务正在停止.
mysql8 服务已成功停止。
D:>net start mysql8
mysql8 服务正在启动 …
mysql8 服务已经启动成功。
D:>net stop mysql8
mysql8 服务正在停止.
mysql8 服务已成功停止。

七，使用MySQL交互式命令

1，进入交互式命令行环境：

C:\WINDOWS\system32>mysql -u root -p
Enter password: ******************
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.0.23 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>

2，可以开始使用MySQL命令了，比如：

mysql> SHOW ENGINES;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine             | Support | Comment                                                        | Transactions | XA   | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MEMORY             | YES     | Hash based, stored in memory, useful for temporary tables      | NO           | NO   | NO         |
| MRG_MYISAM         | YES     | Collection of identical MyISAM tables                          | NO           | NO   | NO         |
| CSV                | YES     | CSV storage engine                                             | NO           | NO   | NO         |
| FEDERATED          | NO      | Federated MySQL storage engine                                 | NULL         | NULL | NULL       |
| PERFORMANCE_SCHEMA | YES     | Performance Schema                                             | NO           | NO   | NO         |
| MyISAM             | YES     | MyISAM storage engine                                          | NO           | NO   | NO         |
| InnoDB             | DEFAULT | Supports transactions, row-level locking, and foreign keys     | YES          | YES  | YES        |
| BLACKHOLE          | YES     | /dev/null storage engine (anything you write to it disappears) | NO           | NO   | NO         |
| ARCHIVE            | YES     | Archive storage engine                                         | NO           | NO   | NO         |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+

3，退出：

mysql> quit
Bye

• 也能使用 ctrl+D

八，后续问题

1，启动失败及解决

问题描述：最近需要重新连接MySQL做一些功能测试，使用net start mysql启动MySQL时却提示 服务名无效：

问题发现：逛了一圈，使用 win+R 运行 services.msc 后未发现发现有MySQL服务。
解决方案：执行 mysqld --install mysql 重新初始化MySQL服务，再使用net start mysql启动MySQL，成功L：