Django之数据表增删改查

Posted 2020-10-12 黎明NB

Django数据增删改查：

上课代码

from django.shortcuts import render,HttpResponse

# Create your views here.
from app01 import models

def addBook(request):

    # 一对多的添加
    # 方式1
    #models.Book.objects.create(title="python",price=100,publishDate="2017-12-12",publish_id=1)//这是规定传值

    # 方式2
    # pubObj=models.Publish.objects.filter(name="人民出版社")[0]
    # models.Book.objects.create(title="python2",price=120,publishDate="2017-10-12",publish=pubObj)  # 关联的出版社对象这个比较灵活

    # 多对多的添加
    #book_obj=models.Book.objects.create(title="红楼梦", price=100, publishDate="2017-12-12", publish_id=2)

    # alex_obj=models.Author.objects.filter(name="alex")[0]
    # egon_obj=models.Author.objects.filter(name="egon")[0]
    # egon_obj=models.Author.objects.filter(name="yuan")[0]
    # print("======",book_obj.authorlist) # []
    #
    # authorList=models.Author.objects.all()
    #
    #
    # # 绑定多对多的关系
    #
    # #book_obj.authorlist.add(alex_obj,egon_obj)  # [alex_obj,egon_obj]#这个是添加可以列举的作者
    # book_obj.authorlist.add(*authorList)  # [alex_obj,egon_obj]#这个是添加不可列举的


    #   解除多对多的关系

    # book_obj=models.Book.objects.filter(title="红楼梦").first()
    # authorList=models.Author.objects.filter(id__lt=3)
    # print(book_obj.authorlist.remove(*authorList))#解除多对多关系的


    # 清除关系方法
    # book_obj = models.Book.objects.filter(title="红楼梦").first()
    # book_obj.authorlist.clear()这是清除关系的
    return HttpResponse("OK")
def query(request):
    # 一对多的查询
    # 查询linux这本书的出版社的地址？

    # linux_obj=models.Book.objects.filter(title="linux").first()#查出的是一个对象
    #
    # print(linux_obj.title)
    # print(linux_obj.price)
    # print(linux_obj.publishDate)
    #
    # print(linux_obj.publish.name)  # 与这本书对象关联的出版社对象直接点就行了
    # print(linux_obj.publish.addr)  # 与这本书对象关联的出版社对象

    # 人民出版社出版过的书籍的名字
    # publish_obj=models.Publish.objects.filter(name="人民出版社")[0]
    # print(publish_obj.bookList.all())  # 与这个出版社对象关联的所有书籍对象


    # 多对多的查询

    # 查询追风筝的人的所有作者的姓名和年龄

    # book_obj=models.Book.objects.filter(title="追风筝的人")[0]
    # print("=====",book_obj.authorlist.all()  )         #  与这本书关联的所有作者对象，集合对象
    # authorlist=book_obj.authorlist.all()#这个是多个的就用.all()
    # print(authorlist.values("name","age"))

    # 查询yuan出版过的所有书籍的名字和价格

    #author_yuan=models.Author.objects.get(name="yuan")

    #print(author_yuan.book_set.all())  # 与这个作者关联的所有书籍对象
    #print(author_yuan.bookList.all().values("title","price"))

   # 反向查找（一对多）
   # publish_obj = models.Publish.objects.filter(name="人民出版社")[0]
   # print(publish_obj.book_set.all().values("title","price"))#反向查找找到的是一个集合
   #多对多反向查询（多对多）
   # author_obj=models.Author.objects.filter(name="frank").first()
    #print(author_obj.book_set.all().values("title","price"))

    # 一对一关系查询

    # 正向查询

    # 查询手机号为456的作者的姓名

    detail_obj=models.Author2Detail.objects.filter(tel="456").first()
    print(detail_obj.author.name)#  与tel="456"的Author2Detail关联的作者对象

    # 反向查询
    # 查询景丽洋的手机号
    author_obj=models.AuthorA.objects.filter(name="景丽洋").first()
    print(author_obj.author2detail.tel) # 789
    print(author_obj.abc.tel) # 789

    return HttpResponse("OK")

 

 

from django.db import models

# Create your models here.



class 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)
    wordNum=models.IntegerField(default=0)#增属性的默认值可以自己设置
    readNum=models.IntegerField(default=0)增属性的默认值可以自己设置
    publish=models.ForeignKey("Publish",related_name="bookList")

    authorlist=models.ManyToManyField("Author",related_name="bookList") # 多对多的关系，自动创建关系表

    def __str__(self):

        return self.title


class Publish(models.Model):
    name = models.CharField(max_length=32)
    addr = models.CharField(max_length=32)

    def __str__(self):
        return self.name

class Author(models.Model):
    name=models.CharField(max_length=32)
    age=models.IntegerField()
    def __str__(self):
        return self.name


class AuthorA(models.Model):
    name=models.CharField(max_length=32)
    age=models.IntegerField()

class Author2Detail(models.Model):
    tel=models.IntegerField()
    addr=models.CharField(max_length=32)
    author=models.OneToOneField("AuthorA",related_name="abc")



# class Book2Author(models.Model):
#     book=models.ForeignKey("Book")
#     author=models.ForeignKey("Author")

 

 

 

 

 

 

 

views

from django.shortcuts import render, HttpResponse
from app01 import models


# Create your views here.
def addBook(request):
    # pass
    #建立一对一的关系

    # models.Book.objects.create
    # 建立一对多关系
    # 方法一
    # models.Book.objects.create(title="python", publishDate="1998-10-27", price="233", publish_id=1)
    # 方法二
    # publish_obj=models.Publish.objects.filter(name="人民出版社").first()#获得是一个集合要变成一个对象
    # models.Book.objects.create(title="python", publishDate="1998-10-27", price="233", publish=publish_obj)
    # 建立多对多关系
    # author_obj1=models.Author.objects.filter(name="frank").first()
    # author_obj2=models.Author.objects.filter(name="egon").first()
    # book_obj=models.Book.objects.create(title="C", publishDate="1998-10-27", price="233", publish_id=2)
    # book_obj.authorlist.add(author_obj1,author_obj2)
    #建立多对多的关系最终版本
    # book_obj = models.Book.objects.create(title="C", publishDate="1998-10-27", price="233", publish_id=2)
    # authorList=models.Author.objects.all()
    # book_obj.authorlist.add(*authorList)

    # 解除关系的
    # book_obj=models.Book.objects.filter(title="C#").first()
    # author_obj=models.Author.objects.filter(name="frank").first()
    # print( book_obj.authorlist.remove(author_obj))

    # #清空关系
    # book_obj=models.Book.objects.filter(title="C#").first()
    # print( book_obj.authorlist.clear())
    return HttpResponse("ok")


def query(request):
    # 正向查询
    # 一对多查询
    # 查询python的作者
    # book_obj=models.Book.objects.filter(title="python")[0]
    # print(book_obj.publish.name)
    # print(book_obj.publish.addr)
    # 多对多查询
    # book_obj=models.Book.objects.filter(title="C").first()
    # print(book_obj.authorlist.all().values("name","age"))

    # 反向查找（一对多）
    # publish_obj = models.Publish.objects.filter(name="人民出版社")[0]
    # print(publish_obj.book_set.all().values("title","price"))#反向查找找到的是一个集合
    #多对多反向查询（多对多）
    author_obj=models.Author.objects.filter(name="frank").first()
    print(author_obj.book_set.all().values("title","price"))
    # 一对一关系查询

    # 正向查询

    # 查询手机号为456的作者的姓名

    detail_obj = models.Author2Detail.objects.filter(tel="456").first()
    print(detail_obj.author.name)  # 与tel="456"的Author2Detail关联的作者对象

    # 反向查询
    # 查询景丽洋的手机号
    author_obj = models.AuthorA.objects.filter(name="景丽洋").first()
    print(author_obj.author2detail.tel)  # 789#反向查询不用加_set
    print(author_obj.abc.tel)  # 789

    return HttpResponse("查到了")

数据增删

models

from django.db import models

# Create your models here.
class 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)
    publish=models.ForeignKey("Publish")
    authorlist=models.ManyToManyField("Author")
    def __str__(self):
        return  self.title
class Publish(models.Model):
    name=models.CharField(max_length=32)
    addr=models.CharField(max_length=32)
    def __str__(self):
        return  self.name
class Author(models.Model):
    name=models.CharField(max_length=32)
    age=models.IntegerField()
    def __str__(self):
       return  self.name
class AuthorDetail(models.Model):
    telphone=models.IntegerField()
    addr=models.CharField(max_length=32)
    author=models.OneToOneField("Author")
    def __str__(self):
        return self.addr

models代码