我试着找到与mysql相关的这个问题的答案：
说一个数据库hello-there然后它的文件夹表示是：hello@002dthere
正如mysql帮助所说：http://dev.mysql.com/doc/refman/5.5/en/identifier-mapping.html
All nonletter characters except underscore (_), as well as letters from alphabets
that do not have uppercase/lowercase mapping (such as Hebrew) are encoded using
hexadecimal representation using lowercase letters for hex digits a..f:
0x003F -> @003f
0xFFFF -> @ffff
The hexadecimal values correspond to character values in the ucs2 double-byte
character set.
有没有办法找到在mysql客户端发布的相应文件夹名称 显示数据库; 有人可能会争辩：分析数据库名称并将任何非字母数字转换为ucs2，但这是性能杀手：
mysql> select hex('-');
+----------+
| hex('-') |
+----------+
| 2D |
+----------+
...谢谢