插入中文是乱码，尝试了许多方法，比如我先把vim里设置为:set fileencoding=utf-8不起作用，后来想想也对，和vim没什么关系
然后就尝试c#代码，用Encoding.UTF8.GetString()方法，后来也不对。
我就郁闷了，忽然想起来莫不是mysql的设置问题？？？
于是，sudo nano /etc/mysql/my.cnf
插入下面红色代码，default-character-set = utf8，成功,不乱码了~~~根本不用什么Encoding.....

This was formally known as [safe_mysqld]. Both versions are currently parsed.

[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]

* Basic Settings

user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
default-character-set = utf8
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
language = /usr/share/mysql/english
skip-external-locking