在django中通过子类化django.db.models.Model对多个数据库进行添加、删除和更新

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'default_db',
        'USER': 'username',
        'PASSWORD': 'password',
        'HOST': 'localhost',
        'PORT': '3306',
    },
    'second_db': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'second_db',
        'USER': 'username',
        'PASSWORD': 'password',
        'HOST': 'localhost',
        'PORT': '3306',
    },
}

from django.db import models

class MyModel(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.IntegerField()

    class Meta:
        db_table = 'my_model_table'
        app_label = 'my_app'

class MyModelSecondDB(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.IntegerField()

    class Meta:
        db_table = 'my_model_second_db_table'
        app_label = 'my_app'
        using = 'second_db'