天下事有难易乎?为之,则难者亦易矣;不为,则易者亦难矣。人之为学有难易乎?学之,则难者亦易矣;不学,则易者亦难矣。

Mysql5.7修改用户密码,报错“Unknown trigger has an error in its body: ‘Unknown system variable ‘maintain_user”

往事如烟 185次浏览 0个评论 扫描二维码

Mysql5.7更改用户密码,报错“Unknown trigger has an error in its body: ‘Unknown system variable ‘maintain_user”,这里是因为恢复数据后,直接通过“skip-grant-tables”进入Mysql修改用户密码,忽略了触发器造成的,报出上面的错误。

正常情况下,mysql5.7用户密码修改,口令为:

mysql> update mysql.user set authentication_string = password('新的密码') where user='用户名' and host='%';
mysql> flush privileges;

直接更改完退出,即可。

当出现“Unknown trigger has an error in its body: ‘Unknown system variable ‘maintain_user”时,是因为有触发器没有删除造成的,

查询并删除,

mysql> select trigger_schema,trigger_name from information_schema.triggers;
+----------------+----------------------------+
| trigger_schema | trigger_name |
+----------------+----------------------------+
| sys | sys_config_insert_set_user |
| sys | sys_config_update_set_user |
+----------------+----------------------------+
2 rows in set (0.03 sec)
mysql> drop trigger sys.sys_config_insert_set_user;
Query OK, 0 rows affected (0.06 sec)

mysql> drop trigger sys.sys_config_update_set_user;
Query OK, 0 rows affected (0.02 sec)

再次执行密码更新操作。

mysql> update mysql.user set authentication_string = password('新的密码') where user='用户名' and host='%';
ERROR 1064 (42000): Unknown trigger has an error in its body: 'Unknown system variable 'maintain_user_list''
mysql>

仍然报错,说明触发器没有删除彻底,找到触发器文件,彻底删除。

找到自己数据恢复的目录,查找以“.trg”为结尾的触发器文件,这里数据恢复目录为/home/mysql/data,执行find查找口令:

[root@localhost ~]# find /home/mysql/data/ -iname *.trg
/home/mysql/data/mysql/proxies_priv.TRG
/home/mysql/data/mysql/user.TRG

查询到2个触发器的文件,更改后缀名,

[root@localhost ~]# mv /home/mysql/data/mysql/user.TRG /home/mysql/data/mysql/user.TRG.back
[root@localhost ~]# mv /home/mysql/data/mysql/proxies_priv.TRG /home/mysql/data/mysql/proxies_priv.TRG.back

退出Mysql,重新登录进来,切换到mysql.user表,重新更新密码

[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.30 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;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> update mysql.user set authentication_string = password('新的密码') where user='用户名' and host='%';
Query OK, 1 row affected, 1 warning (0.02 sec)
Rows matched: 1 Changed: 1 Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

修改成功,退出mysql,注释下“skip-grant-tables”,重新登录,输入新的密码。

到此mysql更新密码完成。


发表我的评论
取消评论
表情 贴图 加粗 删除线 居中 斜体 签到

Hi,您需要填写昵称和邮箱!

  • 昵称 (必填)
  • 邮箱 (必填)
  • 网址