MySQL忘记密码了怎么办（完整解决步骤）

环境:

系统Windows 10
MySQL-8.0

操作步骤：

1. 停止MySQL服务。

   net stop MySql80

   

   

2. 打开mysql.exe和mysqld.exe所在的文件夹,复制路径地址 

   

3. 跳过MySql密码验证登录服务，打开命令窗口cmd，进入mysql安装目录下的bin目录,然后输入如下命令：

   //8.0版本以下有效
   mysqld --skip-grant-tables
   
   //mysqld –skip-grant-tables实测在mysql8.0中已失效，使用如下命令
   mysqld --console --skip-grant-tables --shared-memory

4. 如果正常执行的话就不能输入了，需要重新打开一个cmd命令窗口，输入mysql命令就可以直接登录了，跳过了密码验证过程。

    

5. 如果不正常执行，那么就需要检查一下你的mysql路径下的文件了，是否缺少data和my.ini这两个文件。

   

    

6. 接下来我们需要先删除自己的mysql服务。

   //根据自己的服务改成相应的名字
   sc delete MySql80

7. 接下来新建my.ini配置文件代码如下：

   //简易版
   [mysql]
   default-character-set=utf8
   [mysqld]
   default-storage-engine=INNODB
   basedir=C:/Program Files/MySQL/MySQL Server 8.0
   datadir=C:/Program Files/MySQL/MySQL Server 8.0/data

   //复杂版
   # 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 = C:Program FilesMySQLMySQL Server 8.0
   datadir =  C:Program FilesMySQLMySQL Server 8.0data
   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

   其中basedir和databir记得改成自己mysql安装目录的路径。

8. 接着打开cmd窗口，在mysql的bin目录下执行如下语句：

   mysqld --initialize-insecure --user=mysql

   会自动生成data文件夹。接着再输入如下命令：

   //后面的路径改成自己的ini文件的路径，这个操作是安装MySql服务，同时设置绑定my.ini配置文件
   mysqld --install "MySql80" --defaults-file="C:Program FilesMySQLMySQL Server 8.0my.ini"

   最后打开MySql服务。

   net start MySql80

9. 此时再重新登录mysql 会发现不需要密码就可以登录了，输入更改代码命令 改成你不会忘记的密码即可。

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