CentOS 7下MySQL5.7的修改字符集編碼為UTF8（解決中文亂碼問題）
【From：】http://www.2cto.com/database/201311/255324.html
一、登入MySQL檢視用show variables like 'character%';下字符集，顯示如下：
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1 2 3 4 5 6 7 8 9 10 11 12 |
+--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | latin1 | | character_set_filesystem |binary| | character_set_results | utf8 | | character_set_server | latin1 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ |
character_set_database和character_set_server的預設字符集還是latin1。
二、最簡單的完美修改方法，修改mysql的/etc/my.cnf 檔案中的字符集鍵值（注意配置的欄位細節）：
1. 在[mysqld]欄位里加入character_set_server=utf8，如下：
2. [mysqld]
3. port = 3306
4. socket = /var/lib/mysql/mysql.sock
character_set_server=utf8
修改完成後，sudo systemctl restart mysqld重啟mysql
使用show variables like 'character%';檢視，發現資料庫編碼全已改成utf8。
1. +--------------------------+----------------------------+
2. | Variable_name | Value |
3. +--------------------------+----------------------------+
4. | character_set_client | utf8 |
5. | character_set_connection | utf8 |
6. | character_set_database | utf8 |
7. | character_set_filesystem | binary |
8. | character_set_results | utf8 |
9. | character_set_server | utf8 |
10. | character_set_system | utf8 |
11. | character_sets_dir | /usr/share/mysql/charsets/ |