Updating Mysql JSON field

问题

I'm using django 1.8.9 and MySQL 5.7.17. I've a following table:

+----------+--------------+------+-----+---------+----------------+
| Field    | Type         | Null | Key | Default | Extra          |
+----------+--------------+------+-----+---------+----------------+
| brand    | varchar(255) | YES  | MUL | NULL    |                |
| new_info | json         | YES  |     | NULL    |                |
| keywords | json         | YES  |     | NULL    |                |
| notes    | varchar(255) | YES  |     | NULL    |                |
| id       | mediumint(9) | NO   | MUL | NULL    | auto_increment |
+----------+--------------+------+-----+---------+----------------+

In django I have this model (JSONField is from django_mysql):

class info_by_kw(Model):
    brand = ForeignKey(Brand, on_delete=CASCADE, db_column='brand')
    # new_info = JSONField(blank=True, null=True)
    keywords = JSONField(blank=True, null=True)
    notes = CharField(max_length=255, blank=True, null=True)

When the data is saved I get a very meaningful error: (-1, 'error totally whack'). Anyway, it ends up in the following SQL statement:

UPDATE `products_info_by_kw` SET `brand` = _binary'BINGO!', `keywords` = _binary'[[\\"Tomato\\", \\"Madness\\"]]', `notes` = _binary'' WHERE `products_info_by_kw`.`id` = 48;

With the more or less expected result:

ERROR 3144 (22032): Cannot create a JSON value from a string with CHARACTER SET 'binary'.

Brief search gave this result: https://code.djangoproject.com/ticket/26140, so maybe it's a right thing to do and my mysql (or django) is misconfigured. Does anyone have an idea of how to fix it?

回答1:

Turned out that there was some agitation (if not fuss) around the _binary prefix lately in https://github.com/PyMySQL/mysqlclient-python. So version 1.3.8 that I was using was affected by it, while in 1.3.9 the change has been reverted. My code works now as intended.

来源：https://stackoverflow.com/questions/41868744/updating-mysql-json-field