djang系列5.5-- 图书管理系统实例

一.表格设计

E-R图

分析图

models.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)
    price = models.DecimalField(max_digits=5, decimal_places=2)
    publisher = models.ForeignKey(to='Publish',to_field='id',on_delete=models.CASCADE)
    authors = models.ManyToManyField(to='Author')