vim settings #HelloWorld/HelloWorld目錄下

DATABASES = {
  'default': {
    'ENGINE': 'django.db.backends.mysql', #mysql數(shù)據(jù)庫中第一個庫test
    'NAME': 'test',
    'USER': 'root',
    'PASSWORD': '123456',
    'HOST':'127.0.0.1',
    'PORT':'3306',
  },
  'article': {
    'ENGINE': 'django.db.backends.mysql', # mysql數(shù)據(jù)庫中第二個庫test2
    'NAME': 'test2',
    'USER': 'root',
    'PASSWORD': '123456',
    'HOST':'127.0.0.1',
    'PORT':'3306',
  }
}

django-admin.py startapp blog ##HelloWorld/目錄下建立網(wǎng)站app，我建了兩個app（blog和article）

vim settings ##/HelloWorld/HelloWorld目錄下

INSTALLED_APPS = [
  'django.contrib.admin',
  'django.contrib.auth',
  'django.contrib.contenttypes',
  'django.contrib.sessions',
  'django.contrib.messages',
  'django.contrib.staticfiles',
  'blog',
  'article',
]

vim models.py ##blog目錄下

from django.db import models
# Create your models here.
class Teacher(models.Model):
  id = models.IntegerField(primary_key=True)
  name = models.CharField(max_length=50)
  class Meta:
    db_table = 'teacher'#默認庫test中建立名為teacher的表。字段就是id和name

python manage.py migrate ##建立Django系統(tǒng)表，首次運行即可
python manage.py makemigrations ##生成遷移計劃，每次加表或字段時都運行生成計劃
python manage.py migrate ##同步用戶定義的表

vim models.py #blog目錄下，新建個表測試下，可以在添加或修改刪除幾個字段試試

class Student(models.Model):
  id = models.IntegerField(primary_key=True)
  name = models.CharField(max_length=50)
  student_number = models.CharField(default="",max_length=50)
  class Meta:
    db_table = 'student'

cd article #進入article目錄
vim models.py #article目錄下

from django.db import models
class Author(models.Model):
  id = models.IntegerField(primary_key=True)
  name = models.CharField(max_length=50)
  author_ids = models.CharField(max_length=50)
  class Meta:
    db_table = 'author'
    app_label = 'article' ##對應的article這個應用，名字要一致

python manage.py makemigrations article ##生成同步計劃
##對article應用執(zhí)行同步，同步到 article（settings中的配置，對應test2）對應的數(shù)據(jù)庫中.
python migrate article --database article ##執(zhí)行計劃，必須加--database 指定要同步的庫

cd blog #進入blog目錄下
vim models.py ##blog目錄下，在文件中增加一個表，注意后邊app_label

class Group(models.Model):
  id = models.IntegerField(primary_key=True)
  group_name = models.CharField(max_length=50)
  class Meta:
    db_table = 'group'
    app_label = 'article' ##必須指定這個庫

python manage.py makemigrations article ##生成同步計劃，雖說改的是blog
python migrate article --database article ##執(zhí)行計劃，雖說改的是blog

vim view.py ##blog目錄下，添加下列代碼

from blog.models import Teacher
def orm_handle_db(request):
  test1 = Teacher(id=1,name='runoob',teacher_number='10') ##定義數(shù)據(jù)
  test1.save() ##保存
  return render_to_response('orm_handle_db.html')

vim urls.py ##blog目錄下

from django.conf.urls import url
from blog import views
urlpatterns = [
  url(r'^hello/$', views.hello),
  url(r'^search/$', views.search),
  url(r'^post_search/$', views.post_search),
  url(r'^search_submit$', views.search_submit),
  url(r'^post_search_submit$', views.post_search_submit),
  url(r'^db_handle/$', views.db_handle),
  url(r'^orm_handle_db/$', views.orm_handle_db), ##這里配置好
]

vim orm_handle_db.html ##blog/templates目錄下

vim settings.py ##HelloWorld/HelloWorld目錄下，添加下面兩項

DATABASES_APPS_MAPPING = {
  'blog': 'default',
  'article': 'article',
    }
DATABASE_ROUTERS = ['HelloWorld.database_app_router.DatabaseAppsRouter']

vim database_app_router.py ##配置路由 ,HelloWorld/HelloWorld/目錄下。直接粘貼

from django.conf import settings
class DatabaseAppsRouter(object):
def db_for_read(self, model, **hints):
app_label = model._meta.app_label
if app_label in settings.DATABASES_APPS_MAPPING:
res = settings.DATABASES_APPS_MAPPING[app_label]
print(res)
return res
return None
def db_for_write(self, model, **hints):
app_label = model._meta.app_label
if app_label in settings.DATABASES_APPS_MAPPING:
return settings.DATABASES_APPS_MAPPING[app_label]
return None
def allow_relation(self, obj1, obj2, **hints):
db_obj1 = settings.DATABASES_APPS_MAPPING.get(obj1._mata.app_label)
db_obj2 = settings.DATABASES_APPS_MAPPING.get(obj2._mata.app_label)
if db_obj1 and db_obj2:
if db_obj1 == db_obj2:
return True
else:
return False
return None
def db_for_migrate(self, db, app_label, model_name=None, **hints):
if db in settings.DATABASES_APPS_MAPPING.values():
return settings.DATABASES_APPS_MAPPING.get(app_label) == db
elif app_label in settings.DATABASES_APPS_MAPPING:
return False
return None

vim views.py #blog目錄下，添加下方代碼

from blog.models import Teacher,Group##這是第8步?jīng)]有的
def orm_handle_db(request):
  test1 = Teacher(id=1,name='runoob',teacher_number='10')
  test2 = Group(id=1,group_name='runoob') ##這是第8步?jīng)]有的
  test1.save()
  test2.save()##這是第8步?jīng)]有的
  return render_to_response('orm_handle_db.html')