day03-模型类操作数据表

通过模型类操作数据表
一对多类

class HeroInfo(models.Model):
    """英雄人物类"""
    hname = models.CharField(max_length=20)
    # 性别 False 指男性
    hgender = models.BooleanField(default=False)
    # 备注
    hcomment = models.CharField(max_length=128)
    # 关系属性 建立图书类与英雄人物类 一对多关系
    hbook = models.ForeignKey('BookInfo',on_delete=models.CASCADE)

shell

from booktest.models import BookInfo,HeroInfo
from datetime import date
b = BookInfo()
b.btitle = '天龙八部'
b.bpub_date = date(2020,1,28)
b.save()

h = HeroInfo()
h.hame = '段誉'
h.hgender = False
h.hcomment = '六脉神剑'
h.hbook = b
h.save()

h2 = HeroInfo()
h2.hname = '乔峰'
h2.hcomment = '降龙十八掌'
h2.hbook = b
h2.save()

h3 = HeroInfo.objects.get(id=2)
h3.hname
h3.hbook
h3.hbook_id
h3.hbook.btitle

b.heroinfo_set.all()
BookInfo.objects.all()
HeroInfo.objects.all()