Django模型层（2）

https://www.cnblogs.com/yuanchenqi/articles/8963244.html from django.db import models class Author(models.Model): nid = models.AutoField(primary_key=True) name=models.CharField( max_length=32) age=models.IntegerField() # 与AuthorDetail创建一对一的关系
    authorDetail=models.OneToOneField(to="AuthorDetail",on_delete=models.CASCADE) class AuthorDetail(models.Model): nid = models.AutoField(primary_key=True) birthday=models.DateField() telephone=models.BigIntegerField() addr=models.CharField( max_length=64) class Publish(models.Model): nid = models.AutoField(primary_key=True) name=models.CharField( max_length=32) city=models.CharField( max_length=32) email=models.EmailField() 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) # 与Publish创建一对多的关系,外键字段创建在多的一方
    publish=models.ForeignKey(to="Publish",to_field="nid",on_delete=models.CASCADE) # 与Author表创建多对多的关系,ManyToManyField能够建在两个模型中的任意一个，自动建立第三张表
    authors=models.ManyToManyField(to='Author',)