MYSQL 如何实现不同数据库保存到不同物理位置

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| cpc |
| food |
| mysql |
| test |
+--------------------+
5 rows in set (0.00 sec)

mysql> use food;
Database changed
mysql> create table b(b int);
Query OK, 0 rows affected (0.14 sec)

mysql> insert into b values(1),(2),(3);
Query OK, 3 rows affected (0.11 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql> select * from b;
+------+
| b |
+------+
| 1 |
| 2 |
| 3 |
+------+
3 rows in set (0.00 sec)

mysql>