mysql update json字段,更新Mysql JSON字段

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')

# n