mysql中文乱码的解决方法

mysql编码格式查询和修改

mysql> show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | latin1                     |
| character_set_connection | latin1                     |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | latin1                     |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

参数说明：
character_set_client为客户端编码方式；

character_set_connection为建立连接使用的编码；

character_set_database数据库的编码；

character_set_results结果集的编码；

character_set_server数据库服务器的编码；

初始的mysql，会出现查询结果中文乱码，用中文作为参数查询不到数据的情况，只要保证以上四个采用的编码方式一样，就不会出现乱码问题，也可以用中文正常查询。

mysql> select * from SECURITY_ROLE limit 1;
+----------------------------------+---------------------+-------------+------------+-------+------------+
| ID                               | CREATE_TIME         | DESCRIPTION | IDENTITY   | NAME  | SUPERVISOR |
+----------------------------------+---------------------+-------------+------------+-------+------------+
| ff8080815c7cf447015c7cf4824a0066 | 2017-06-06 18:30:17 | ?????       | SUPERVISOR | ????? |           |
+----------------------------------+---------------------+-------------+------------+-------+------------+
1 row in set (0.00 sec)

修改编码：
set names utf8；等同于：
set character_set_client=utf8;
set character_set_results=utf8;
set character_set_connection=utf8;

mysql> show variables like 'char%';
+--------------------------+----------------------------+
| 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     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

之后就可以正常查询了：

mysql> select * from SECURITY_ROLE limit 1;
+----------------------------------+---------------------+-----------------+------------+-----------------+------------+
| ID                               | CREATE_TIME         | DESCRIPTION     | IDENTITY   | NAME            | SUPERVISOR |
+----------------------------------+---------------------+-----------------+------------+-----------------+------------+
| ff8080815c7cf447015c7cf4824a0066 | 2017-06-06 18:30:17 | 超级管理员 | SUPERVISOR | 超级管理员 |           |
+----------------------------------+---------------------+-----------------+------------+-----------------+------------+
1 row in set (0.00 sec)