今天小编给大家分享一下Django项目怎么配置连接多个数据库的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
一个APP对应一个默认数据库，若连接其他数据库用".using()"
Author.objects.using('db02').all()1、在项目settings中增加数据库配置
# settings.py DATABASES = { 'default': { 'ENGINE': 'django.db.backends.oracle', 'NAME': 'orcl19c', 'USER': "username01", 'PASSWORD': "password01", 'HOST': "110.10.1.11", 'PORT': 1511, }, 'db_2': { 'ENGINE': 'django.db.backends.oracle', 'NAME': 'orcl19c', 'USER': "username02", 'PASSWORD': "password02", 'HOST': "120.20.2.22", 'PORT': 1512, }}# 以下MyProject改成项目名，默认default不用修改DATABASE_ROUTERS = ['MyProject.database_router.DatabaseAppsRouter']DATABASE_APPS_MAPPING = { 'app01': 'default', 'app02': 'db_2',}2、在项目根目录下Myproject/Myproject 新建数据库路由文件database_router.py
直接复制以下代码，无需修改
from django.conf import settings DATABASE_MAPPING = settings.DATABASE_APPS_MAPPINGclass 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 None3、使用inspectdb反向生成各app的model类之后，配置model类对应要链接的数据库
反向生成models.py 命令：
python manage.py inspectdb --database db1 TableName1 > app01/models.py python manage.py inspectdb --database db2 TableName2 > app02/models.py# 编辑app01下的models.py:class Names(models.Model): #该model使用default数据库 id=models.CharField(primary_key=True,max_length=100, blank=True, null=True) name=models.CharField(max_length=32,primary_key=True,unique=True) class Meta: #app_label = 'app01' #由于该model连接default数据库，所以在此无需指定 db_table = 'names' # 编辑app02下的models.py:class Classnum(models.Model): #该model使用default数据库 id=models.CharField(primary_key=True,max_length=100, blank=True, null=True) classnum=models.CharField(max_length=32,primary_key=True,unique=True) class Meta: app_label = 'app02' db_table = 'classnum'4、同步数据库
# 同步default节点数据库，只运行不带 --database参数的命令，不对其他数据库进行同步 python manage.py makemigrations python manage.py migrate # 同步db02节点数据库： python manage.py makemigrations python manage.py migrate --database=db025、若要连接配置外的数据库
Author.objects.using('other').all()my_object.save(using='legacy_users')my_object.delete(using='legacy_users')移动对象到另一个数据库时会发生主键冲突，可以使用obj.pk方法清除主键再保存对象
>>> p = Person(name='Fred')>>> p.save(using='first')>>> p.pk = None # Clear the primary key.>>> p.save(using='second') # Write a以上就是“Django项目怎么配置连接多个数据库”这篇文章的所有内容，感谢各位的阅读！相信大家阅读完这篇文章都有很大的收获，小编每天都会为大家更新不同的知识，如果还想学习更多的知识，请关注编程网行业资讯频道。
