Reason: mysql5 defaults the wait_timeout of its connection to 8 hours
modify the configuration file. The steps are as follows:

【1】 Log in to MySQL and CMD
MySQL – H host address – U user name – P user password (for example, MySQL – hlocalhost – uroot – p123456)

【2】 View wait_ Timeout, CMD command:
show global variables like ‘wait_ timeout’;

[3] if wait_ Timeout is too small to be modified. CMD command:
set global wait_ timeout=604800;
set global interactive_ timeout=604800;
after modification, you can test.