[MySQL] MySQL8.0修改密码的正确姿势分享

• 前言
  
• mysql5.7.9之后取消了password函数，authentication_string=password("123456")会报错
  
• 正确更改密码的方式
  
• 总结
  

mysql> USE mysql;
Database changed
mysql> UPDATE user SET authentication_string="123456" WHERE user="root";
Query OK, 1 row affected (0.39 sec)
Rows matched: 1  Changed: 1  Warnings: 0
 
mysql> FLUSH privileges;  # 刷新保存
Query OK, 0 rows affected (0.13 sec)

C:\WINDOWS\system32>mysql -u root -p
Enter password: ******
ERROR 1045 (28000): Access denied for user ‘root’@‘localhost’ (using password: YES)
1234567891011121314

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "your_password";
mysql> USE mysql;
Database changed
mysql> ALTER USER 'root'@'localhost' IDENTIFIEED WITH mysql_native_password BY "markjun";
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 'IDENTIFIEED WITH mysql_native_password BY "markjun"' at line 1
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "markjun";
Query OK, 0 rows affected (0.18 sec)
 
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "123456";
Query OK, 0 rows affected (0.08 sec)
 
mysql> SELECT user, authentication_string FROM user;
+------------------+------------------------------------------------------------------------+
| user       | authentication_string                          |
+------------------+------------------------------------------------------------------------+
| mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.session  | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.sys    | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| root       | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9                |
+------------------+------------------------------------------------------------------------+
4 rows in set (0.00 sec)
 
mysql> FLUSH privileges;
Query OK, 0 rows affected (0.38 sec)
 
mysql> quit;
Bye
 
F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -p
Enter password: *******
...
 
mysql>

• 备注: 清空root密码
  

F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -p
Enter password: *******
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
 
F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
...
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 
mysql> USE mysql;
Database changed
 
mysql> SELECT user, authentication_string FROM user;
+------------------+------------------------------------------------------------------------+
| user       | authentication_string                          |
+------------------+------------------------------------------------------------------------+
| mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.session  | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.sys    | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| root       | 123456                                |
+------------------+------------------------------------------------------------------------+
4 rows in set (0.34 sec)
 
mysql> UPDATE user SET authentication_string="" WHERE user="root";
Query OK, 1 row affected (0.20 sec)
Rows matched: 1  Changed: 1  Warnings: 0
 
mysql> SELECT user, authentication_string FROM user;
+------------------+------------------------------------------------------------------------+
| user       | authentication_string                          |
+------------------+------------------------------------------------------------------------+
| mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.session  | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.sys    | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| root       |                                    |
+------------------+------------------------------------------------------------------------+
4 rows in set (0.00 sec)
 
mysql> FLUSH privileges;
Query OK, 0 rows affected (0.10 sec)
 
mysql> quit;
Bye

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysql
MySQL 服务正在启动 .
MySQL 服务无法启动。
服务没有报告任何错误。
请键入 NET HELPMSG 3534 以获得更多的帮助。

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysql
MySQL 服务正在启动 ...
MySQL 服务已经启动成功。

F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
...
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>