首先来创建一个模型,数据库的关系就清楚了
models.py
ORM数据库的多表操作(增、删、改、查)
首先我们来准备几张表
model.py
ORM数据库的多表操作(增、删、改、查)
首先我们来准备几张表
model.py
from django.db import models
# Create your models here.
class Author(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField(max_length=32)
age = models.IntegerField()
au = models.OneToOneField(to='AuthorDetail',to_field='id',on_delete=models.CASCADE)
class AuthorDetail(models.Model):
id = models.AutoField(primary_key=True)
address = models.CharField(max_length=32)
tel = models.CharField(max_length=11)
class Publish(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField(max_length=22)
addr = models.CharField(max_length=64)
class Book(models.Model):
id = models.AutoField(primary_key=True)
title = models.CharField(max_length=32)
publisher = models.ForeignKey(to='Publish',to_field='id',on_delete=models.CASCADE)
authors = models.ManyToManyField(to='Author')
一.添加
一对一
方式1
book_obj = models.Book(title='python',price=123)
book_obj.save()
方式2