Django项目同时连接多个不同的数据库

项目需要连接多个不同的数据库，不同的应用操作不同的库。

以下是具体的修改步骤：

一、修改setting.py中的 DATABASES

DATABASES = {
    'default': {
    },
    'mysql': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'zz', # 数据库名称
        'HOST': '127.0.0.1', # 数据库地址，本机 ip 地址 127.0.0.1
        'PORT': 3306, # 端口
        'USER': 'root',  # 数据库用户名
        'PASSWORD': 'root', # 数据库密码
    },
    'postgress': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'postgres',
        'USER': 'postgres',
        'PASSWORD': '',
        'HOST': '127.0.0.1',
        'PORT': '5432',
    },
}

2、还是在setting.py文件中配置应用对应的数据库

# 配置数据库操作路由
DATABASE_ROUTERS = ['application.database_router.DatabaseAppsRouter']
DATABASE_APPS_MAPPING = {
    'app1':'mysql',
    'app2':'postgress',
}

3、在setting.py同目录下新建 database_router.py文件

添加以下代码

# -*- coding: utf-8 -*-

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

ok!然后就可以创建模型，在对应的app中操作数据库了。

有不懂的可以参考这篇文章。。。。

初学Django