Django app配置多个数据库代码实例

# settings.py
# DATABASES中必须要有default字段
DATABASES = {
  'default': {
    'ENGINE': 'django.db.backends.mysql',
    'NAME': 'db',
    'USER': '',
    'PASSWORD': '',
    'HOST': "localhost",
    'OPTIONS': {'init_command': 'SET default_storage_engine=INNODB;'}
    },
  'db1': {
    'ENGINE': 'django.db.backends.mysql',
    'NAME': 'db1',
    'USER': '',
    'PASSWORD': '',
    'HOST': "localhost",
    'OPTIONS': {'init_command': 'SET default_storage_engine=INNODB;'}
  }
  }

# settings.py
DATABASES_APPS_MAPPING = {
  'app1': 'default',
  'app2': 'db1',
}

DATABASE_ROUTERS = ['utils.database_router.DatabaseAppsRouter']

from django.conf import settings


class DatabaseAppsRouter(object):
  def db_for_read(self, model, **hints):
    app_label = model._meta.app_label
    if app_label in settings.DATABASES_APPS_MAPPING:
      return settings.DATABASES_APPS_MAPPING[app_label]
    return None

  def db_for_write(self, model, **hints):
    app_label = model._meta.app_label
    if app_label in settings.DATABASES_APPS_MAPPING:
      return settings.DATABASES_APPS_MAPPING[app_label]
    return None

class Book2(models.Model):
  author = models.CharField(max_length=1024, blank=True, null=True)
  title = models.CharField(max_length=1024)

  class Meta:
    app_label = 'db1'