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当我从 tbl_class 表中查询时，我遇到了非常奇怪的错误。

COLLATION 'utf8_general_ci' 对 CHARACTER SET 'utf8mb4' 无效

这是查询

SELECT CONCAT(SUBSTRING_INDEX(ac.class_group_name, ';', 1), '/'),
 ac.class_upper_class_id INTO return_path,
 parent_id 
FROM tbl_class AS ac 
WHERE ac.class_id = category_id
and ac.class_org_group_code = org_group_code collate utf8_general_ci;

my.cnf 就像

[mysqld]
character-set-server=utf8
collaction-server=utf8_general_ci

show variables like '%character%'
+--------------------------+----------------------------+
| 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       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+

列的排序规则就像

+------------------------+--------------+-----------------+------+-----+---------+-------+---------------------------------+-----------------------+
| Field                  | Type         | Collation       | Null | Key | Default | Extra | Privileges                      | Comment               |
+------------------------+--------------+-----------------+------+-----+---------+-------+---------------------------------+-----------------------+
| class_id               | int(11)      | NULL            | NO   | PRI | 0       |       | select,insert,update,references |                       |
| class_kind             | varchar(1)   | utf8_general_ci | YES  |     | NULL    |       | select,insert,update,references |                       |
| class_upper_class_id   | int(11)      | NULL            | YES  |     | NULL    |       | select,insert,update,references |                       |
| class_org_group_code   | varchar(10)  | utf8_general_ci | NO   | PRI |         |       | select,insert,update,references |                       |
| class_group_code       | varchar(50)  | utf8_general_ci | YES  |     | NULL    |       | select,insert,update,references |                       |

表的字符集就像

KEY `tbl_class_idx2` (`class_org_group_code`,`class_upper_class_id`,`class_kind`,`class_order_no`),
  KEY `tbl_class_idx3` (`class_org_group_code`,`class_group_code`),
  KEY `tbl_class_idx4` (`class_user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |

我重新启动了mysql，但发生了同样的错误。而且根本没有utf8mb4。为什么？

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