ERROR1396(HY000):OperationALTERUSERfailedfor‘root‘@‘localhost‘

手打不易，转载注明出处：https://zhangxiaofan.blog.csdn.net/article/details/84555847

mysql连数据库的时候报错:

1251 client does not support authentication protocol requested by server;consider upgrading Mysql client

ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'localhost'

先登录mysql

mysql -u root -p

输入密码

mysql> use mysql;

mysql> select user,host from user;

+------------------+-----------+
| user             | host      |
+------------------+-----------+
| root             | %         |
| admin            | localhost |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| zhangj           | localhost |
+------------------+-----------+

注意我的 root，host是'%'

你可能执行的是:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123';

改成:

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123';

---

如果还是不行：

尝试一：重置密码为空

先登录MySQL，重置密码为空，并刷新

update user set authentication_string='' where user='root';

flush privileges;

再用上面的方法修改密码