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MySQL8.0修改密碼的正確姿勢(shì)分享

更新時(shí)間：2022年03月05日 14:53:39 作者：_Kane

如果當(dāng)初設(shè)置了一個(gè)很復(fù)雜的數(shù)據(jù)庫(kù)密碼,是很可能忘記的,下面這篇文章主要給大家介紹了關(guān)于MySQL8.0修改密碼的正確姿勢(shì),需要的朋友可以參考下

前言

mysql 更新完密碼，總是拒絕連接、登錄失敗?MySQL8.0 不能通過(guò)直接修改 mysql.user 表來(lái)更改密碼。正確更改密碼的方式備注: 清空root密碼

MySQL8.0 不能通過(guò)直接修改 mysql.user 表來(lái)更改密碼。

因?yàn)閍uthentication_string字段下只能是MySQL加密后的43位字符串密碼，其他的導(dǎo)致錯(cuò)誤。錯(cuò)誤不報(bào)出，但是無(wú)法再登錄mysql，總是會(huì)提示無(wú)法認(rèn)證。

參考：MySQL8.0

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)

mysql 5.7.9 之后取消了password 函數(shù)，authentication_string=password("123456") 會(huì)報(bào)錯(cuò)

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

如果你已經(jīng)這樣更改密碼，并且導(dǎo)致了無(wú)法進(jìn)入mysql。本人表示同情之時(shí)，還為了你提供了詳細(xì)的解決方案。請(qǐng)查看本文備注：清空root 密碼

正確更改密碼的方式

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>

備注: 清空root密碼

停止 MySQL 任務(wù) net stop MySQL

mysqld 命令 mysqld --console --skip-grant-tables --shared-memory

無(wú)密碼進(jìn)入mysql mysql -u root

清空root 密碼 UPDATE user SET authentication_string="" WHERE user=“root”;

另一個(gè)終端無(wú)密碼進(jìn)入

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

停止 mysqld 任務(wù)，Ctrl+C 結(jié)束任務(wù)，或者直接關(guān)閉運(yùn)行 mysqld 的 cmd 終端。

需要先停止運(yùn)行上述 mysqld 任務(wù),否則報(bào)錯(cuò)

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysql
MySQL 服務(wù)正在啟動(dòng) .
MySQL 服務(wù)無(wú)法啟動(dòng)。

服務(wù)沒有報(bào)告任何錯(cuò)誤。

請(qǐng)鍵入 NET HELPMSG 3534 以獲得更多的幫助。

先停止上述 mysqld 任務(wù)

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysql
MySQL 服務(wù)正在啟動(dòng) ...
MySQL 服務(wù)已經(jīng)啟動(dòng)成功。

現(xiàn)在 mysql root 已經(jīng)沒有了密碼

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>