python---django使用數據庫
阿新 • • 發佈:2018-03-23
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官方教程點擊此處
項目默認使用sqlite
DATABASES = { ‘default‘: { ‘ENGINE‘: ‘django.db.backends.sqlite3‘, ‘NAME‘: os.path.join(BASE_DIR, ‘db.sqlite3‘), } }
並且在根目錄中生成數據庫文件
db.sqlite3
1.創建應用:官方規定,如果要使用模型,必須先創建一個app
python manage.py startapp ts
記得創建後去settings文件中查看應用是否添加進去,沒有則自己添加,否則該應用中數據表創建失敗
INSTALLED_APPS = ( ‘django.contrib.admin‘, ‘django.contrib.auth‘, ‘django.contrib.contenttypes‘, ‘django.contrib.sessions‘, ‘django.contrib.messages‘, ‘django.contrib.staticfiles‘, ‘ts‘ )
2.在ts目錄中
migrations#目錄 __init__.py __init__.py admin.py models.py tests.py views.py
找到models文件,在這裏面創建表
from django.db import models # Create your models here. class User(models.Model): name=models.CharField(max_length=64)
3.命令生成數據表:
python manage.py makemigrations
會自動知道我們的模型中的改變,並且開始創建數據庫(對於多個應用,會排除已經創建過的,對於新的,會執行這個操作)
Migrations for ‘ts‘: 0001_initial.py: - Create model User
開始創建數據表:
python manage.py migrate
Operations to perform:
Synchronize unmigrated apps: staticfiles, messages
Apply all migrations: sessions, admin, ts, auth, blog, contenttypes
Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Installing custom SQL...
Running migrations:
Rendering model states... DONE
Applying ts.0001_initial... OK
創建成功
4.開始使用數據庫
from ts import models # Create your views here. def show_db(request): models.User.objects.create( name="test" ) ret=models.User.objects.all() for item in ret: print(item.name) return HttpResponse("<h1>test over</h1>")
記得在urls文件中修改路由
from ts import views as v2
urlpatterns = [ url(r‘^test‘,v2.show_db) ]
python---django使用數據庫