mysql5.7 set the character encoding

[Ubuntu] mysql default configuration file path

sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf

Modify the configuration file, [mysqld] add content and [client] configuration item

# mysqld 
[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci
init_connect='SET NAMES utf8'

# client
[client]
default-character-set=utf8

Restart Service

sudo /etc/init.d/mysql restart

Validation results

mysql> show variables like 'character_set_%';
mysql> show variables like 'collation_%';