这次我创建的是：create database test2

grant all on test2.* to ‘test2’@‘localhost’ identified by ‘123456’;

flush privileges;

mysql -hlocalhost -utest2 -p

MariaDB [(none)]> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect…
Connection id: 55
Current database: *** NONE ***

ERROR 1184 (08S01): Aborted connection 55 to db: ‘unconnected’ user: ‘test2’ host: ‘localhost’ (init_connect command failed)