Mysql编码引起的Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT)错误

查看Mysql的编码和库、表里的是否一致

show variables where Variable_name like 'collation%';
+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database   | utf8_general_ci |
| collation_server     | utf8_unicode_ci |
+----------------------+-----------------+

里面的collation没有不一致，而mysql5.5默认的collation为utf8_general_ci，

查看服务器的my.cnf文件有配置 windows下面是my.ini文件

如果忘记了MySQL的安装目录，可以进入mysql输入命令快速找到

show variables like "%char%";

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     | utf8                                   |
| character_set_system     | utf8                                   |
| character_sets_dir       | D:\mysql-5.6.31-winx64\share\charsets\ |
+--------------------------+----------------------------------------+
8 rows in set (0.00 sec)

mysql>

可能是存储过程执行中创建临时表时collation用的是utf8_general_ci，造成创建临时表和实际的两张表字段collation不匹配才报的这个错误，那么要真是这样的话，就得配置my.ini让Mysql和我们的表的collation一样，就可以了。

于是在my.ini文件中修改成这样：

   [client]
  port=3306
  default-character-set=utf8
  [mysqld]
  port=3306
  character_set_server=utf8
  collation_server=utf8_general_ci

重启Mysql,再把存储过程中的两张表和字段全部使用utf8_general_ci，然后把数据库也设置成utf8_general_ci，再执行存储过程，OK！可以运行了