命令

mysql -u root -p
use mysql
select user,host,plugin from user;
alter user 'haidragon'@'%' identified with mysql_native_password by 'pass123';
select user,host,plugin from user;
exit
mysql.server restart (mac）

192:etc haidragon$ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 18
Server version: 8.0.15 Homebrew

Copyright (c) 2000, 2019, 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
Database changed
mysql> select user,host,plugin from user;
+------------------+-----------+-----------------------+
| user | host | plugin |
+------------------+-----------+-----------------------+
| haidragon | % | caching_sha2_password |
| mysql.infoschema | localhost | caching_sha2_password |
| mysql.session | localhost | caching_sha2_password |
| mysql.sys | localhost | caching_sha2_password |
| root | localhost | caching_sha2_password |
+------------------+-----------+-----------------------+
5 rows in set (0.00 sec)

mysql> alter user 'haidragon'@'%' identified with mysql_native_password by 'pass123'
-> ;
Query OK, 0 rows affected (0.01 sec)

mysql> select user,host,plugin from user;
+------------------+-----------+-----------------------+
| user | host | plugin |
+------------------+-----------+-----------------------+
| haidragon | % | mysql_native_password |
| mysql.infoschema | localhost | caching_sha2_password |
| mysql.session | localhost | caching_sha2_password |
| mysql.sys | localhost | caching_sha2_password |
| root | localhost | caching_sha2_password |
+------------------+-----------+-----------------------+
5 rows in set (0.00 sec)

mysql> exit
Bye
192:etc haidragon$ sqlite3 
Display all 116 possibilities? (y or n)
192:etc haidragon$ sqlit
192:etc haidragon$ my
my_print_defaults mysql_secure_installation mysqldump
myisam_ftdump mysql_ssl_rsa_setup mysqldumpslow
myisamchk mysql_tzinfo_to_sql mysqlimport
myisamlog mysql_upgrade mysqlpump
myisampack mysqladmin mysqlrouter
mysql mysqlbinlog mysqlrouter_plugin_info
mysql.server mysqlcheck mysqlshow
mysql_client_test mysqld mysqlslap
mysql_config mysqld_multi mysqltest
mysql_config_editor mysqld_safe mysqlxtest
192:etc haidragon$ mysql.server restart
Shutting down MySQL
.. SUCCESS! 
Starting MySQL
.. SUCCESS! 
192:etc haidragon$ 
参考：
https://blog.csdn.net/myNameIssls/article/details/84031426