Django4模型（操作数据库）

python manage.py makemigrations
python manage.py migrate

from django.db import models
class Person(models.Model):
    name = models.CharField(max_length=30) #字符串 长度30
    age = models.IntegerField() # 数值

class Blog(models.Model):
    name = models.CharField(max_length=100)
    tagline = models.TextField()
    def __unicode__(self):  # __str__ on Python 3
        return self.name
class Entry(models.Model):
    #blog = models.ForeignKey(Blog) 错误 需要加上on_delete才可以
    blog = models.ForeignKey(Blog, on_delete=models.CASCADE)