以下是cmd的操作 （重启服务，修改my.ini 文章下面有my.ini配置）  当修改密码为123456是sqlyog连接成功 修改为root时连接报老错误，又修改为123456 在修改为root就连接正常了

Microsoft Windows [版本 10.0.18363.1139]

(c) 2019 Microsoft Corporation。保留所有权利。

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

Enter password:

ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

Enter password:

ERROR 1045 (28000): Access denied for user '-root'@'localhost' (using password: NO)

C:\Program Files\MySQL\MySQL Server 8.0>net stop mysql

没有启动 mysql 服务。

请键入 NET HELPMSG 3521 以获得更多的帮助。

C:\Program Files\MySQL\MySQL Server 8.0>start stop mysql

系统找不到文件 stop。

C:\Program Files\MySQL\MySQL Server 8.0>start stop mysql

系统找不到文件 stop。

C:\Program Files\MySQL\MySQL Server 8.0>net start mysql

发生系统错误 1058。

无法启动服务，原因可能是已被禁用或与其相关联的设备没有启动。

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

Enter password:

ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

mysql: [ERROR] Unknown suffix 'X' used for variable 'port' (value 'X').

mysql: [ERROR] mysql: Error while setting value 'X' to 'port'.

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

mysql: [ERROR] Unknown suffix 'X' used for variable 'port' (value 'X').

mysql: [ERROR] mysql: Error while setting value 'X' to 'port'.

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

mysql: [ERROR] Unknown suffix 'X' used for variable 'port' (value 'X').

mysql: [ERROR] mysql: Error while setting value 'X' to 'port'.

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

mysql: [ERROR] Unknown suffix 'X' used for variable 'port' (value 'X').

mysql: [ERROR] mysql: Error while setting value 'X' to 'port'.

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

Enter password:

ERROR 1045 (28000): Access denied for user '-root'@'localhost' (using password: NO)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

Enter password:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

Enter password:

ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

Enter password:

ERROR 1045 (28000): Access denied for user '-root'@'localhost' (using password: NO)

C:\Program Files\MySQL\MySQL Server 8.0>net stop mysql

没有启动 mysql 服务。

请键入 NET HELPMSG 3521 以获得更多的帮助。

C:\Program Files\MySQL\MySQL Server 8.0>net start mysql

发生系统错误 1058。

无法启动服务，原因可能是已被禁用或与其相关联的设备没有启动。

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

Enter password:

ERROR 1045 (28000): Access denied for user '-root'@'localhost' (using password: NO)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -u -root -p

Enter password:

ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

Enter password:

ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

C:\Program Files\MySQL\MySQL Server 8.0>mysqld --console --skip-grant-tables --shared-memory

2023-04-18T02:17:23.068636Z 0 [System] [MY-010116] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe (mysqld 8.0.22) starting as process 8376

2023-04-18T02:17:23.077728Z 0 [ERROR] [MY-010338] [Server] Can't find error-message file 'C:\Program Files\MySQL\share\errmsg.sys'. Check error-message file location and 'lc-messages-dir' configuration directive.

2023-04-18T02:17:23.102886Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.

2023-04-18T02:17:23.104836Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.

2023-04-18T02:17:23.106562Z 0 [ERROR] [MY-010119] [Server] Aborting

2023-04-18T02:17:23.108782Z 0 [System] [MY-010910] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe: Shutdown complete (mysqld 8.0.22)  MySQL Community Server - GPL.

C:\Program Files\MySQL\MySQL Server 8.0>mysqld --console --skip-grant-tables --shared-memory

2023-04-18T02:17:34.512473Z 0 [System] [MY-010116] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe (mysqld 8.0.22) starting as process 8080

2023-04-18T02:17:34.512548Z 0 [ERROR] [MY-010338] [Server] Can't find error-message file 'C:\Program Files\MySQL\share\errmsg.sys'. Check error-message file location and 'lc-messages-dir' configuration directive.

2023-04-18T02:17:34.540343Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.

2023-04-18T02:17:34.542127Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.

2023-04-18T02:17:34.543209Z 0 [ERROR] [MY-010119] [Server] Aborting

2023-04-18T02:17:34.546384Z 0 [System] [MY-010910] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe: Shutdown complete (mysqld 8.0.22)  MySQL Community Server - GPL.

C:\Program Files\MySQL\MySQL Server 8.0>mysqld --console --skip-grant-tables --shared-memory

2023-04-18T02:17:36.988495Z 0 [System] [MY-010116] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe (mysqld 8.0.22) starting as process 10996

2023-04-18T02:17:36.988568Z 0 [ERROR] [MY-010338] [Server] Can't find error-message file 'C:\Program Files\MySQL\share\errmsg.sys'. Check error-message file location and 'lc-messages-dir' configuration directive.

2023-04-18T02:17:37.018230Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.

2023-04-18T02:17:37.020658Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.

2023-04-18T02:17:37.022340Z 0 [ERROR] [MY-010119] [Server] Aborting

2023-04-18T02:17:37.024609Z 0 [System] [MY-010910] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe: Shutdown complete (mysqld 8.0.22)  MySQL Community Server - GPL.

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

Enter password:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

C:\Program Files\MySQL\MySQL Server 8.0>mysql -uroot -p

Enter password: ****

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 11

Server version: 8.0.22 MySQL Community Server - GPL

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

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> use mysql;

Database changed

mysql> mysql> select Host,User,plugin from mysql.user;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mysql> select Host,User,plugin from mysql.user' at line 1

mysql> alter user root@localhost identified with mysql_native_password by '123456';

Query OK, 0 rows affected (0.07 sec)

mysql>

mysql> FLUSH PRIVILEGES；

   -> alter user root@localhost identified with mysql_native_password by '123456';

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'PRIVILEGES；

alter user root@localhost identified with mysql_native_password by' at line 1

mysql>

mysql> FLUSH PRIVILEGES；

   -> alter user root@localhost identified with mysql_native_password by '123456';

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'PRIVILEGES；

alter user root@localhost identified with mysql_native_password by' at line 1

mysql>

mysql> FLUSH PRIVILEGES；

   -> alter user root@localhost identified with mysql_native_password by 'root';

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'PRIVILEGES；

alter user root@localhost identified with mysql_native_password by' at line 1

mysql> alter user root@localhost identified with mysql_native_password by 'root'

   ->

   ->

   -> alter user root@localhost identified with mysql_native_password by 'root'

   -> alter user root@localhost identified with mysql_native_password by 'root';

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'alter user root@localhost identified with mysql_native_password by 'root'

alter ' at line 4

mysql> alter user root@localhost identified with mysql_native_password by '123456';

Query OK, 0 rows affected (0.06 sec)

mysql> alter user root@localhost identified with mysql_native_password by 'root';

Query OK, 0 rows affected (0.09 sec)

mysql>

这是 my.ini文件

[mysqld]

#（------这是看博客额外添加的 据说可以跳过密码登录 但是在我这没啥用------- ）

skip-grant-tables

# 设置3306端口

port=3306

# 设置mysql的安装目录   ----------是你的文件路径-------------

basedir=C:\Program Files\MySQL\

# 设置mysql数据库的数据的存放目录  ---------是你的文件路径data文件夹自行创建

datadir=C:\Program Files\MySQL\MySQL Server 8.0\data

# 允许最大连接数

max_connections=200

# 允许连接失败的次数。

max_connect_errors=10

# 服务端使用的字符集默认为utf8mb4

character-set-server=utf8mb4

# 创建新表时将使用的默认存储引擎

default-storage-engine=INNODB

# 默认使用“mysql_native_password”插件认证

#mysql_native_password

default_authentication_plugin=mysql_native_password

[mysql]

# 设置mysql客户端默认字符集

default-character-set=utf8mb4

[client]

# 设置mysql客户端连接服务端时默认使用的端口

port=3306

default-character-set=utf8mb4