model。py

from django.db import models

class UserType(models.Model):
    title = models.CharField(max_length=32)

class UserInfo(models.Model):
    name = models.CharField(max_length=64)
    email = models.CharField(max_length=64)
    ut = models.ForeignKey(to=‘UserType‘)

命令

python3 manage.py makemigrations

 
# 指定到db1 數據庫裏面生成表結構
python3 manage.py migrate app01 --database=db1

方式一：手動

view。py

from django.shortcuts import render,HttpResponse
from app01 import models
def index(request):

    models.UserType.objects.using(‘db1‘).create(title=‘普通用戶‘)
　　# 手動指定去某個數據庫取數據
    result = models.UserType.objects.all().using(‘
 
db1‘)
    print(result)

    return HttpResponse(‘...‘)

註意：

models.UserType.objects   取出來是一個queryset對象

自動：添加配置文件 （讀寫分離）

class Router1:
　　#  指定到某個數據庫取數據
    def db_for_read(self, model, **hints):
        """
        Attempts to read auth models go to auth_db.
        
 
"""
        if model._meta.model_name == ‘usertype‘:
            return ‘db1‘
        else:
            return ‘default‘
　　　# 指定到某個數據庫存數據
    def db_for_write(self, model, **hints):
        """
        Attempts to write auth models go to auth_db.
        """
        return ‘default‘

再寫上配置

DATABASES = {
    ‘default‘: {
        ‘ENGINE‘: ‘django.db.backends.sqlite3‘,
        ‘NAME‘: os.path.join(BASE_DIR, ‘db.sqlite3‘),
    },
    ‘db1‘: {
        ‘ENGINE‘: ‘django.db.backends.sqlite3‘,
        ‘NAME‘: os.path.join(BASE_DIR, ‘db.sqlite3‘),
    }
}
DATABASE_ROUTERS = [‘db_router.Router1‘,]

class Router1:
    def allow_migrate(self, db, app_label, model_name=None, **hints):
        """
        All non-auth models end up in this pool.
        """
　　　　　# 對數據庫遷移也做了約束
        if db==‘db1‘ and app_label == ‘app02‘:
            return True
        elif db == ‘default‘ and app_label == ‘app01‘:
            return True
        else:
            return False

    def db_for_read(self, model, **hints):
        """
        Attempts to read auth models go to auth_db.
        """
        if model._meta.app_label == ‘app01‘:
            return ‘default‘
        else:
            return ‘db1‘

    def db_for_write(self, model, **hints):
        """
        Attempts to write auth models go to auth_db.
        """
        if model._meta.app_label == ‘app01‘:
            return ‘default‘
        else:
            return ‘db1‘

多數據庫操作