Navicat cannot connect to mysql and mysql password change (Authentication plugin 'caching_sha2_password' cannot be loaded)

• Reason: The encryption rule in the version before mysql8 is mysql_native_password, and after mysql8, the encryption rule is caching_sha2_password. There are two ways to solve the problem, one is to upgrade the navicat driver, and the other is to restore the mysql user login password encryption rule to mysql_native_password. This time we will explain the second method
• Enter into mysql:mysql -u root -p
• use mysql
• Check the encryption method: select user, host, plugin, authentication_string from user;. if
  
  • user: what usernames mysql has now, such as root
  • host: the ip open for the user, such as % means that all IPs can be accessed, it can be 'localhost' (only local access, equivalent to 127.0.0.1), or a specific ' . . . ' (specifically a certain IP )
  • plugin: plugin, that is, encryption rules, the new mysql is caching_sha2_password
  • authentication_string: encrypted password
• Modify the encryption method and password for connecting to the root user: ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'password';. In this command, root is the username; % is the host to be accessed; password The newly modified password can be customized. Similarly, the encryption method of root@localhost can also be changed. ALTER USER 'root'@'%' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;If the execution of this command is invalid, it can be executed to modify the encryption rules before executing this command .
• Test if navacat is connected successfully, if not, refresh permissionsFLUSH PRIVILEGES;
• Finally, you can also modify the password separately (or not, because it has been modified above):alter user 'root'@'%' identified by '111111';