from django.shortcuts import render,HttpResponse
from app01 import models
# Create your views here.def query(request):# ###############基于对象查询（子查询）############### 一对多查询 book-->publish#正向查询：# 查询python这本书的出版社的email邮箱.python_obj = models.Book.objects.filter(title ='python').first()print(python_obj.publish.email)return HttpResponse(' OK')

python_obj =models.Book.objects.filter(title ='python').first()print(python_obj)for author in  python_obj.authors.all():print(author.name,author.age)return HttpResponse('ok')

  #查询 alex出版过的书籍alex =models.Author.objects.filter(name ='哪吒').first()for book  in alex.book_set.all():print(book.title)return HttpResponse('ok')

from django.shortcuts import render,HttpResponse
from app01 import models
# Create your views here.def query(request):# ###############基于对象查询（子查询）############### 正向查询按字段查询# 一对多查询 book----------------------->publish#                  <----------------------#反向查询 book_set.all()# #正向查询：## # 查询python这本书的出版社的email邮箱.## python_obj = models.Book.objects.filter(title ='python').first()# print(python_obj.publish.email)#f反向查询 按表明小写_set.all()#查询五道口出版社的书籍名称# pub_obj =models.Publish.objects.filter(name ='五道口出版社').last()# for obj  in pub_obj.book_set.all():#     print(obj.title)# 按字段查询 正向查询（author.all())
# 多对多  book----------------------> author# <----------------------# book_set.all()#查询python作者的年龄# python_obj =models.Book.objects.filter(title ='python').first()# print(python_obj)# for author in  python_obj.authors.all():#     print(author.name,author.age)#查询 alex出版过的书籍# alex =models.Author.objects.filter(name ='哪吒').first()# for book  in alex.book_set.all():#     print(book.title)## 按字段查询 正向查询（authordetail.all())# 多对多  author----------------------> authordetail# <----------------------# 按表名 author#查询 哪吒的电话号码nezhao_obj = models.Author.objects.filter(name ='哪吒').first()print(nezhao_obj.authorDetail.telephone)# 反向查询# 查询家在山东的作者名字add_obj = models.AuthorDetail.objects.filter(addr ="山东").first()print(add_obj.author.name)#############################基于queryset和__查询（join的查询)##########################正向查询：按字段#反向查询 ：表名小写#查询python这本书籍的出版社的邮箱ret =models.Book.objects.filter(title ='python').values('publish__email')print(ret )#查询清华出版社的书籍名称#方法1qinghua_obj =models.Publish.objects.filter(name ='清华出版社').values('book__title')print(qinghua_obj)#方法2qinghua_obj=  models.Book.objects.filter(publish__name='清华出版社').values('title')print(qinghua_obj)#   查询哪吒的手机号ret = models.Author.objects.filter(name ='哪吒').values('authorDetail__telephone')print(ret)return HttpResponse('ok')#查询手机号 以 186开头的作者的出版过的书籍名称以及对应的出版社

from django.db import models# Create your models here.class Author(models.Model):nid = models.AutoField(primary_key=True)name=models.CharField( max_length=32)age=models.IntegerField()# 与AuthorDetail建立一对一的关系authorDetail=models.OneToOneField(to="AuthorDetail",on_delete=models.CASCADE)def __str__(self):return  self.nameclass AuthorDetail(models.Model):nid = models.AutoField(primary_key=True)birthday=models.DateField()telephone=models.BigIntegerField()addr=models.CharField( max_length=64)def __str__(self):return  self.addrclass Publish(models.Model):nid = models.AutoField(primary_key=True)name=models.CharField( max_length=32)city=models.CharField( max_length=32)email=models.EmailField()def __str__(self):return  self.nameclass Book(models.Model):nid = models.AutoField(primary_key=True)title = models.CharField( max_length=32)publishDate=models.DateField()price=models.DecimalField(max_digits=5,decimal_places=2)# 与Publish建立一对多的关系,外键字段建立在多的一方publish=models.ForeignKey(to="Publish",to_field="nid",on_delete=models.CASCADE)# 与Author表建立多对多的关系,ManyToManyField可以建在两个模型中的任意一个，自动创建第三张表authors=models.ManyToManyField(to='Author',)def __str__(self):return  self.title

from django.shortcuts import render,HttpResponse# Create your views here.
from .models import *
def index(request):#查询沙河出版社所有书籍的名称和价格（一对多）ret = Publish.objects.filter(name="沙河出版社").values("book__title","book__price")  #正向查询按字段，反向查询按表名.print(ret)#打印结果：<QuerySet [{'book__title': 'python入门', 'book__price': Decimal('100.00')}]>"""select book.title,book.price from Publish inner join book on Publish.pk =Book.pulish_id where publish.name ="沙河出版社" """ret=Book.objects.filter(publish__name="沙河出版社").values("title","price")print(ret)#打印结果：<QuerySet [{'title': 'python入门', 'price': Decimal('100.00')}]>return  HttpResponse("ok ")