参考：http://www.cnblogs.com/Magicam/archive/2013/07/22/3207382.html
权限问题，授权 给 root 所有sql 权限
mysql> grant all privileges on *.* to root@"%" identified by ".";
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)