标签：style 创建 har create blog models foreign let nbsp
models.ForeignKey("UserGroup",to_field="gid",default=1,on_delete=models.CASCADE)
"UserGroup" #外键另外一张表
to_field="gid" #另外一张表的字段
on_delete=models.CASCADE #因为不加这个会报错相关（https://www.cnblogs.com/phyger/p/8035253.html）
创建数据表格：
from django.db import models # Create your models here. class userinfo(models.Model): uname = models.CharField(max_length=32,db_column="用户名") pwd = models.CharField(max_length=32,db_column="密码") email = models.EmailField(null=True,db_column="邮箱") usergroup = models.ForeignKey("UserGroup",to_field="gid",default=1,on_delete=models.CASCADE) class UserGroup(models.Model): gid = models.AutoField(primary_key=True) gname = models.CharField(max_length=32) test = models.CharField(max_length=32,null=True) g = models.ForeignKey("Group", to_field="id",null=True,on_delete=models.CASCADE) class Group(models.Model): grouplist = models.CharField(max_length=255)
在每个字段中都录入数据：
usergroup表 外键 g_id
userinfo表 外键 usergroup_id
跨表查询：原理--（对象（对象（对象）））
obj2 = models.userinfo.objects.filter(uname="root").first() print(obj2.usergroup.g.grouplist)
标签：style 创建 har create blog models foreign let nbsp
原文地址：https://www.cnblogs.com/Anec/p/9530194.html
