mysql是一款常用的开源数据库软件，但是对于初次使用者好像并不是太友好，mysql5.x的版本中默认字符集是latin1也就是我们所知道的iso-8859-1字符集，这个字符集编码并没有包含汉字，所以我们在使用的时候汉字会出现乱码情况，通过修改数据库默认字符集即可解决。
进入mysql命令行：
mysql> show variables like '%colla%'; +----------------------+-------------------+ | variable_name | value | +----------------------+-------------------+ | collation_connection | gbk_chinese_ci | | collation_database | latin1_swedish_ci | | collation_server | latin1_swedish_ci | +----------------------+-------------------+ 3 rows in set, 1 warning (0.00 sec) mysql> show variables like '%char%'; +--------------------------+---------------------------------------------------------+ | variable_name | value | +--------------------------+---------------------------------------------------------+ | character_set_client | gbk | | character_set_connection | gbk | | character_set_database | latin1 | | character_set_filesystem | binary | | character_set_results | gbk | | character_set_server | latin1 | | character_set_system | utf8 | | character_sets_dir | c:\program files\mysql\mysql server 5.7\share\charsets\ | +--------------------------+---------------------------------------------------------+ 8 rows in set, 1 warning (0.00 sec)
可以看到现在默认的字符集是latin1
找到mysql的配置文件，windows中的配置文件是my.ini，我的电脑位于c:\programdata\mysql\mysql server 5.7，linux中需要修改的是my.conf文件，具体路径根据你的实际安装位置，分别修改以下节点中的配置：
我使用的5.7中[client]节点的配置需要新增，其余两个节点[mysql]、[mysql]需要打开注释并修改为utf8.
[client] default-character-set=utf8 [mysql] default-character-set=utf8 [mysql] character_set_server=utf8
然后重启mysql
net stop mysql
net start mysql
再次查看字符集，都已经被修改为utf8字符集
mysql> show variables like '%colla%'; +----------------------+-----------------+ | variable_name | value | +----------------------+-----------------+ | collation_connection | gbk_chinese_ci | | collation_database | utf8_general_ci | | collation_server | utf8_general_ci | +----------------------+-----------------+ 3 rows in set, 1 warning (0.00 sec) mysql> show variables like '%char%'; +--------------------------+---------------------------------------------------------+ | variable_name | value | +--------------------------+---------------------------------------------------------+ | character_set_client | gbk | | character_set_connection | gbk | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | gbk | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | c:\program files\mysql\mysql server 5.7\share\charsets\ | +--------------------------+---------------------------------------------------------+ 8 rows in set, 1 warning (0.00 sec)
为保证编码一致性还可以在创建数据库或者表的时候指定字符集，并在连接串后面指定连接参数：
?useunicode=true&characterencoding=utf-8&servertimezone=asia/shanghai
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