客戶提供了MySQL的環境，但是不支持中文，

通過以下命令查看了MySQL的字符集

連接上 mysql 服務，輸入以下命令

mysql> show variables like ‘character_set%‘;

顯示如下：

+--------------------------+----------------------------+  
| Variable_name            | Value                      |  
+--------------------------+----------------------------+  
| character_set_client     | latin1                     |  
| character_set_connection | latin1                     |  
| character_set_database   | latin1                     |  
| character_set_filesystem | binary                     |  
| character_set_results    | latin1                     |  
| character_set_server     | latin1                     |  
| character_set_system     | utf8                       |  
| character_sets_dir       | /usr/share/mysql/charsets/ |  
+--------------------------+----------------------------+ 

為了讓 MySQL 支持中文，需要把字符集改變成 UTF8，

方法如下：

1. 打開etc/my.cnf

2. 修改成如下內容，保存

[client]  
port=3306  
socket=/var/lib/mysql/mysql.sock  
default-character-set=utf8  
  
[mysqld]  
datadir=/var/lib/mysql  
socket=/var/lib/mysql/mysql.sock  
user=mysql  
# Disabling symbolic-links is recommended to prevent assorted security risks  
symbolic-links=0  
character-set-server=utf8  
  
[mysql]  
no-auto-rehash  
default-character-set=utf8  
  
[mysqld_safe]  
log-error=/var/log/mysqld.log  
pid-file=/var/run/mysqld/mysqld.pid 

3. 重啟 mysql 服務：service mysqld restart

再次查看 mysql 編碼，已經更新成如下信息

+--------------------------+----------------------------+  
| Variable_name            | Value                      |  
+--------------------------+----------------------------+  
| character_set_client     | utf8                       |  
| character_set_connection | utf8                       |  
| character_set_database   | utf8                       |  
| character_set_filesystem | binary                     |  
| character_set_results    | utf8                       |  
| character_set_server     | utf8                       |  
| character_set_system     | utf8                       |  
| character_sets_dir       | /usr/share/mysql/charsets/ |  
+--------------------------+----------------------------+ 

CentOS 查看和修改 MySQL 字符集