Django多个数据库（健全性检查）

Question

下午好。我读过很多关于这个话题的地方，从每个地方都能得到一些信息，因为它们看起来并不一致，我相信我能做到这一点。由于这是一个测试设置，我不想花几个月的时间来发现某些东西不起作用——而事实证明这就是原因所在。在

感谢那些比我更有经验的人看这篇文章，并请提出任何建议。在

settings.py

DATABASES = {
'default': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'myproject',
    'USER': 'myprojectuser',
    'PASSWORD': 'abc123',
    'HOST': 'localhost',
    'PORT': '',
},
'ta1_db': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'testapp1db',
    'USER': 'ta1',
    'PASSWORD': 'ta1',
    'HOST': 'localhost',
    'PORT': '',
},
'ta2_db': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'testapp2db',
    'USER': 'ta2',
    'PASSWORD': 'ta2',
    'HOST': 'localhost',
    'PORT': '',
},
}

DATABASE_ROUTERS = ['spiderproject.routers.DBRouter',]

routers.py（在主spiderproject文件夹中）

^{pr2}$

（allow_migrate（）中的elif不确定是否正确。也是allow_relationship（）中的elif。我从一个例子中改编了这些）

我已经注册了testapp1和testapp2的模型管理员py，它们出现在管理页面上-此时添加/删除数据是可以的，我检查它们是否独立存储。在

提前致谢。在

Answer 1

这是我推荐的路由器。以下注释中的说明

class DBRouter(object):
    def db_for_read(self, model, **hints):
        """Send all read operations on 'app_label' app models to associated db"""
        if model._meta.app_label == 'testapp1':
            return 'ta1_db'
        if model._meta.app_label == 'testapp2':
            return 'ta2_db'
        # return None
        
        # I recommend returning 'default' here since 
        # it is your default database
        return 'default'

    def db_for_write(self, model, **hints):
        """Send all write operations on 'app_label' app models to associated db"""
        if model._meta.app_label == 'testapp1':
            return 'ta1_db'
        if model._meta.app_label == 'testapp2':
            return 'ta2_db'
        # return None
        
        # I recommend returning 'default' here since 
        # it is your default database, this will allow
        # commonly used django apps to create their
        # models in the default database (like contenttypes 
        # and django auth
        return 'default'

    def allow_relation(self, obj1, obj2, **hints):
        """Determine if relationship is allowed between two objects."""

        # Allow any relation between two models that are in the same app.
        # I prefer to make this global by using the following syntax
        return obj1._meta.app_label == obj2._meta.app_label


    def allow_migrate(self, db, app_label, model_name=None, **hints):
        
        # I think this was your biggest misunderstanding
        # the db_for_write will pick the correct DB for the migration
        # allow_migrate will only let you say which apps/dbs you 
        # should not migrate.  I *strongly* recommend not taking
        # the belt and braces approach that you had here.        
        return True