python 数据库建表操作

from django.db import models

# Create your models here.

class User(models.Model):
    name = models.CharField(max_length=32)
    age = models.IntegerField()
    register_time = models.DateField()  #  年月日


  #  def __str__(self):
        return '对象：%s'%self.name   #为了方便查看写一个 

  

    # register_time = models.DateTimeField() #有time 的有时分秒
    '''
    DateField
    DateTimeField
    两个重要参数
    auto_now : 每次操作数据的时候，该字段会自动将当前的时间更新
    auto_now_add : 在创建数据的时候会自动将当前创建的时间记录下来，之后只要不人为的修改，那么就一直不变 :
    
    '''
class Book(models.Model):
    title = models.CharField(max_length=32)
    price = models.DecimalField(max_digits=8,decimal_places=2)
    publish_date = models.DateField(auto_now_add=True)

    # 一对多
    publish = models.ForeignKey(to='Publish',on_delete=models.CASCADE)

    # 多对多
    authors = models.ManyToManyField(to='Author')

class Publish(models.Model):
    name = models.CharField(max_length=32)
    addr = models.CharField(max_length=64)
    email = models.EmailField() # vatchar(254)


class Author(models.Model):
    name = models.CharField(max_length=32)
    age = models.IntegerField()
    #  一对一
    author_detail = models.OneToOneField(to = 'AuthorDetail',on_delete=models.CASCADE)
class AuthorDetail(models.Model):
    phone = models.BigIntegerField()
    addr = models.CharField(max_length=64)