show variables like 'datadir';+---------------+-----------------+| Variable_name | Value |+---------------+-----------------+| datadir | /var/lib/mysql/ |+---------------+-----------------+1 row in set (0.00 sec)//然后通过mysql生成一个uuid进行记录等会用于修改select uuid()+--------------------------------------+| uuid() |+--------------------------------------+| 2674149f-5083-11e8-be4b-080027a1f331 |+--------------------------------------+
