在使用mysql5.7时，会发现通过web端向数据库中写入中文后会出现乱码，但是在数据库中直接操作SQL语句插入数据后中文就显示正常，这个问题怎么解决呢？此处不对mysql的数据编码过程和原理进行讲解，如果有兴趣的同学可以自己百度。
下面我们就直接使用如下操作解决：
一、打开mysql控制台，输入命令show variables like 'character%';
显示如下：
+--------------------------+-------------------------------------------+
| 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、重启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/ |
+--------------------------+----------------------------+
还有character_set_database和character_set_server的默认字符集还是latin1。
四、输入命令：set names utf8;
重启后，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，
这样在web端也设置成utf8编码就可以正常输入数据库了。