Django ORM (二) 增加操作
2024-09-07 22:32:22
数据库表结构生成完毕后,可以使用工具连接上去
在 app01_author 表创建基础记录
在 app01_publisher 表创建基础记录
添加 data_oper 方法
在 urls.py 文件上添加
from app01 import views
urlpatterns = [
....
path('data_oper/', views.data_oper),
]
ORM 增加方法
create 方式一
在 views.py 文件上添加
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author
def data_oper(req):
Book.objects.create(
title="hahaha",
price=2,
publication_date="2019-05-16",
publisher_id=1,
)
return HttpResponse("Hello world")
浏览器访问 http://127.0.0.1:8000/data_oper/,成功生成一条记录
create 方式二
在 views.py 文件上修改
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author
def data_oper(req):
dic = { "title":"K8S", "price":1, "publication_date":"2019-05-02", "publisher_id":1 }
Book.objects.create(**dic)
return HttpResponse("Hello world")
浏览器访问 http://127.0.0.1:8000/data_oper/,生成一条记录
save 方式一
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author
# Create your views here.
def data_oper(req):
obj=Book(
title="Python",
price=99,
publication_date="2019-05-06",
publisher_id=1,
)
obj.save()
return HttpResponse("Hello world")
save 方式二
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author
# Create your views here.
def data_oper(req):
obj=Book()
obj.title="GO"
obj.price=90
obj. publication_date="2019-05-06"
obj.publisher_id=1
obj.save()
return HttpResponse("Hello world")
外键一对多的(ForeignKey)
在 models.py 中 Book 表下定义外键为
publisher = models.ForeignKey(Publisher,on_delete=models.CASCADE)
方法一
在 views.py 文件上修改
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author,Publisher
# Create your views here.
def data_oper(req):
pub_obj = Publisher.objects.get(id=1) # 取publish 表 id 为1 的值
dic = {"title": "Docker", "price": 88, "publication_date": "2019-05-05", "publisher": pub_obj}
Book.objects.create(**dic)
return HttpResponse("Hello world")
方法二
在 views.py 文件上修改
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author
def data_oper(req):
dic = { "title":"K8S", "price":1, "publication_date":"2019-05-02", "publisher_id":1 } # 直接指定 publisher 外键值了,这里要加 _id
Book.objects.create(**dic)
return HttpResponse("Hello world")
外键多对多的情况
正向查询
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author,Publisher
# Create your views here.
def data_oper(req):
book=models.Book.objects.filter(id=1)[0]
authors=models.Author.objects.filter(id__gt=2)
book.authors.add(*authors)
return HttpResponse("Hello world")
反向查询
from django.shortcuts import render, HttpResponse
from app01 import models
from app01.models import Book,Author,Publisher
# Create your views here.
def data_oper(req):
book = models.Book.objects.filter(id__gt=1)
authors = models.Author.objects.filter(id=1)[0]
authors.book_set.add(*book)
return HttpResponse("Hello world")
双下划线(__)之单表条件查询
# models.Book.objects.filter(id__lt=10,id__gt=1) # 获取id大于1 且 小于10的值
#
# models.Book.objects.filter(id__in=[11, 22, 33]) # 获取id等于11、22、33的数据
# models.Book.objects.exclude(id__in=[11, 22, 33]) # not in
#
# models.Book.objects.filter(title__contains="ven")
# models.Book.objects.filter(title__icontains="ven") # icontains大小写不敏感
#
# models.Book.objects.filter(id__range=[1, 2]) # 范围bettwen and
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