[mysql]mysql8修改root密码

use mysql
select * from user where user="root";
update user set password=password("mysql@2020") where user="root";

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 "("mysql@2020") where user="root"" at line 1

• 解决：
• 在MySQL 8.04前，执行：SET PASSWORD=PASSWORD("[新密码]");但是MySQL8.0.4开始，这样默认是不行的。因为之前，MySQL的密码认证插件是“mysql_native_password”，而现在使用的是“caching_sha2_password”。

alter user "root"@"localhost"identified with mysql_native_password by "root";
flush privileges;
https://blog.csdn.net/u012232730/article/details/82417245

alter user "root"@"localhost"identified with mysql_native_password by "mysql@2020";
alter user "root"@"%"identified with mysql_native_password by "mysql@2020";
也有文章说不用flush
成功！不用flush。

改完不重启mycat没事
重启就不行了。
mysql> select count(*) from td_b_nodecode;
ERROR 1184 (HY000): Invalid DataSource:0