django.db.utils.OperationalError: (1267, "Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='")
The above error is obviously caused by character set matching. So log in to MySQL to modify the relevant configuration.
First check the MySQL database configuration:
mysql> show variables like '%coll%';
+----------------------+--------------------+
| Variable_name | Value |
+----------------------+--------------------+
| collation_connection | latin1_swedish_ci |
| collation_database | latin1_swedish_ci |
| collation_server | latin1_swedish_ci |
+----------------------+--------------------+
Modify the database configuration to utf8 character set:
SET collation_connection = utf8_general_ci;
SET collation_database = utf8_general_ci;
SET collation_server = utf8_general_ci;
But the error has not changed after accessing the service, then check the character set of the table
mysql> show create table test;
+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| test | CREATE TABLE `test` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(200) CHARACTER SET latin1 NOT NULL,
`depth` int(11) NOT NULL,
`url` varchar(200) CHARACTER SET latin1 NOT NULL,
`creater_id` int(11) NOT NULL,
`parent_id` int(11) DEFAULT NULL,
`app` varchar(20) CHARACTER SET latin1 NOT NULL,
`createtime` datetime(6) NOT NULL,
`operatetime` datetime(6) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `test_name_parent_id_96346d13_uniq` (`name`,`parent_id`),
KEY `test_creater_id_0825cbdf_fk_auth_user_id` (`creater_id`),
KEY `test_parent_id_03eda650_fk_test_id` (`parent_id`),
CONSTRAINT `test_creater_id_0825cbdf_fk_auth_user_id` FOREIGN KEY (`creater_id`) REFERENCES `auth_user` (`id`),
CONSTRAINT `test_parent_id_03eda650_fk_test_id` FOREIGN KEY (`parent_id`) REFERENCES `test` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci |
+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Seeing that the character set of the table is already utf8mb4, then check the configuration of each field:
mysql> show full columns from dataset_folder;
+-------------+--------------+-------------------+------+-----+---------+----------------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+-------------+--------------+-------------------+------+-----+---------+----------------+---------------------------------+---------+
| id | int(11) | NULL | NO | PRI | NULL | auto_increment | select,insert,update,references | |
| name | varchar(200) | latin1_swedish_ci | NO | MUL | NULL | | select,insert,update,references | |
| depth | int(11) | NULL | NO | | NULL | | select,insert,update,references | |
| url | varchar(200) | latin1_swedish_ci | NO | | NULL | | select,insert,update,references | |
| creater_id | int(11) | NULL | NO | MUL | NULL | | select,insert,update,references | |
| parent_id | int(11) | NULL | YES | MUL | NULL | | select,insert,update,references | |
| app | varchar(20) | latin1_swedish_ci | NO | | NULL | | select,insert,update,references | |
| createtime | datetime(6) | NULL | NO | | NULL | | select,insert,update,references | |
| operatetime | datetime(6) | NULL | NO | | NULL | | select,insert,update,references | |
+-------------+--------------+-------------------+------+-----+---------+----------------+---------------------------------+---------+
When you see the characters in the field latin1_swedish_ci, turn to utf8:
mysql> alter table dataset_folder convert to character set utf8mb4 collate utf8mb4_general_ci;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show full columns from dataset_folder; +-------------+--------------+--------------------+------+-----+---------+----------------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+-------------+--------------+--------------------+------+-----+---------+----------------+---------------------------------+---------+
| id | int(11) | NULL | NO | PRI | NULL | auto_increment | select,insert,update,references | |
| name | varchar(200) | utf8mb4_general_ci | NO | MUL | NULL | | select,insert,update,references | |
| depth | int(11) | NULL | NO | | NULL | | select,insert,update,references | |
| url | varchar(200) | utf8mb4_general_ci | NO | | NULL | | select,insert,update,references | |
| creater_id | int(11) | NULL | NO | MUL | NULL | | select,insert,update,references | |
| parent_id | int(11) | NULL | YES | MUL | NULL | | select,insert,update,references | |
| app | varchar(20) | utf8mb4_general_ci | NO | | NULL | | select,insert,update,references | |
| createtime | datetime(6) | NULL | NO | | NULL | | select,insert,update,references | |
| operatetime | datetime(6) | NULL | NO | | NULL | | select,insert,update,references | |
+-------------+--------------+--------------------+------+-----+---------+----------------+---------------------------------+---------+
9 rows in set (0.00 sec)
You can see that the configuration of the field has also been modified.
Visit the service again and return data successfully.