django使用多个数据库的方法实例

DATABASE_APPS_MAPPING = {
# example:
# 'app_name':'database_name',
# 'admin': 'default',
# 'users': 'default', #django
'basic_estate': 'basic_estate',
'footstone': 'footstone',
'mall': 'hsmall',
'iot_biz': 'iot_biz',
'mall': 'mall',
'hsuser': 'hsuser',
}

# -*- coding: utf-8 -*-
"""
@author: o<p style="color:transparent">本文来源gao!daima.com搞$代!码网</p>baby
@license: (C) Copyright 2013-2020, obaby@mars.
@contact: [email protected]
@link: http://www.obaby.org.cn
  http://www.h4ck.org.cn
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@file: atabase_router.py.py
@time: 2021/2/26 9:07
@desc:
"""
from django.conf import settings
 
DATABASE_MAPPING = settings.DATABASE_APPS_MAPPING
 
 
class DatabaseAppsRouter(object):
 """
 A router to control all database operations on models for different
 databases.
 
 In case an app is not set in settings.DATABASE_APPS_MAPPING, the router
 will fallback to the `default` database.
 
 Settings example:
 
 DATABASE_APPS_MAPPING = {'app1': 'db1', 'app2': 'db2'}
 """
 
 def db_for_read(self, model, **hints):
  """"Point all read operations to the specific database."""
  if model._meta.app_label in DATABASE_MAPPING:
   return DATABASE_MAPPING[model._meta.app_label]
  return 'default'
 
 def db_for_write(self, model, **hints):
  """Point all write operations to the specific database."""
  if model._meta.app_label in DATABASE_MAPPING:
   return DATABASE_MAPPING[model._meta.app_label]
  return 'default'
 
 def allow_relation(self, obj1, obj2, **hints):
  """Allow any relation between apps that use the same database."""
  db_obj1 = DATABASE_MAPPING.get(obj1._meta.app_label)
  db_obj2 = DATABASE_MAPPING.get(obj2._meta.app_label)
  if db_obj1 and db_obj2:
   if db_obj1 == db_obj2:
    return True
   else:
    return False
  return None
 
 def allow_syncdb(self, db, model):
  """Make sure that apps only appear in the related database."""
 
  if db in DATABASE_MAPPING.values():
   return DATABASE_MAPPING.get(model._meta.app_label) == db
  elif model._meta.app_label in DATABASE_MAPPING:
   return False
  return None
 
 def allow_migrate(self, db, app_label, model=None, **hints):
  """
  Make sure the auth app only appears in the 'auth_db'
  database.
  """
  if db in DATABASE_MAPPING.values():
   return DATABASE_MAPPING.get(app_label) == db
  elif app_label in DATABASE_MAPPING:
   return False
  return None