在使用mysql5.7時，會發現通過web端向數據庫中寫入中文后會出現亂碼，但是在數據庫中直接操作SQL語句插入數據后中文就顯示正常，這個問題怎么解決呢？此處不對mysql的數據編碼過程和原理進行講解，如果有興趣的同學可以自己百度。
下面我們就直接使用如下操作解決：
一、打開mysql控制台，輸入命令show variables like 'character%';
顯示如下：
+--------------------------+-------------------------------------------+
| Variable_name | Value |
+--------------------------+-------------------------------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | utf8 |
| character_set_results | latin1 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | C:\MySQL\MySQL Server 5.0\share\charsets\ |
+--------------------------+-------------------------------------------+
二、修改my.ini文件
[client]
default-character-set=utf8
[mysqld]
default-storage-engine=INNODB
character-set-server=utf8
collation-server=utf8_general_ci
三、重啟后使用第一步的命令查看，如下：
+--------------------------+----------------------------+
| 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/ |
+--------------------------+----------------------------+
還有character_set_database和character_set_server的默認字符集還是latin1。
四、輸入命令：set names utf8;
重啟后，使用第一步命令查看：
+--------------------------+------------------------------------------------+
| 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 | C:\wamp64\bin\mysql\mysql5.7.9\share\charsets\ |
+--------------------------+------------------------------------------------+
除了character_set_filesystem是binary外，其他都是utf8了，
這樣在web端也設置成utf8編碼就可以正常輸入數據庫了。