1. Project Directory
Two data when there are two of the app
2.model class
app02/models.py
When using multiple databases, each table below we want to use [the app_label = app name], the following example
class Publish(models.Model): name=models.CharField(max_length=32) email=models.EmailField() def __str__(self): return "app02 %s" % self.name class Meta:
#app的名字 app_label = 'app02'
3.settings wording
= {DATABASES 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'ORM', the name of the database ## 'the USER': 'the root', 'PASSWORD': '123456', when installed mysql database ##, root user entered password 'the HOST': '127.0.0.1', }, 'mysql02': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'orm02 ', the name of the database ## ' the uSER ':' the root ', ' pASSWORD ':' 123456 ', when installed mysql database ##, the user inputs the root password ' the HOST ':' 127.0.0.1 ', }, } # Multiple database connection pool DATABASE_ROUTERS = [ 'djangoser.database_router.DatabaseAppsRouter'] # app corresponding thereto disposed connection pool DATABASE_APPS_MAPPING = { 'app01': 'default', 'app02': 'mysql02',
4. Add in the same directory database_router.py
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 None 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 None 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 # for Django 1.4 - Django 1.6 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 # Django 1.7 - Django 1.11 def allow_migrate(self, db, app_label, model_name=None, **hints): print(db, app_label, model_name, hints) if db in DATABASE_MAPPING.values(): return DATABASE_MAPPING.get(app_label) == db elif app_label in DATABASE_MAPPING: return False return None
5. Run
manage.py makemigrations Python --database specify the database to be loaded Python manage.py the migrate --database = app02