First of all, make sure that your configuration is correct. There are a lot of related documents on the Internet, so I won't repeat them here.
Direct solution:
When we use the command line tool to connect to the database, change the encoding of the client (black window):
1. Set the character encoding of the client:
set names gbk
2. Run the following SQL statement before querying
mysql> set character_set_results=gbk；或者mysql> set character_set_results=gb2312；
3. Under DOS environment, use "mysql --default_character_set=gbk -uroot -p***" to enter mysql~~~~