django foreignkey(外键)的实现

2019-11-25 12:11:33

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foreignkey是一种关联字段，将两张表进行关联的方式，我们在dodels.py里写入要生成的两张表：

class Usergroup(models.Model):  uid=models.AutoField(primary_key=True)  caption=models.CharField(max_length=64,null=True)  ctime=models.DateField(auto_now_add=True,null=True)  uptime=models.DateField(auto_now=True,null=True)class Userinfo(models.Model):  username=models.CharField(max_length=32,blank=True)  password=models.FileField(max_length=60,help_text='pwd')  email=models.CharField(max_length=60)  test=models.EmailField(max_length=20,null=True,error_messages={'invalid':'shurumima'})  user_group=models.ForeignKey('Usergroup',to_field='uid',default=1)  #这里与上面的Usergroup表的uid进行关联，默认取到uid=1的行）  user_type_choices=(    (1,'superuser'),    (2,'commonuser'),    (3,'com-commonuser'),  )  user_type_id=models.IntegerField(choices=user_type_choices,default=1)

运行下面两条命令：

C:/Users/Liujiangbu.GLOBALE.001/PycharmProjects/untitled3>python manage.py makemigrations
C:/Users/Liujiangbu.GLOBALE.001/PycharmProjects/untitled3>python manage.py migrate

编辑app项目的views.py加入下面两段：

def user_info(request):  if request.method == "GET":    #userlist = test.objects.all()    userlist2=models.Userinfo.objects.all()  #获取Userinfo表的所有信息    # return render(request,'userinfo.html',{'userlist':userlist})    return render(request, 'userinfo.html', {'userlist2': userlist2})   #模板引用  elif request.method == "POST":    u = request.POST.get('user')    pp= request.POST.get('pwd')    #test.objects.create(username=u,depno=pp)    models.Userinfo.objects.create(username=u,password=pp,user_group_id=1)    return HttpResponse("<p>注册成功</p>")

模板中创建userinfo.html,并加入下面内容：

<!DOCTYPE html><html><head><meta charset="utf-8"><title>666666(runoob.com)</title></head><body style="background-color:silver"><div>  <div style="color:#00FF00">    <a class="menu" href="/home-bak" rel="external nofollow" >是爷们儿就点下 </a>   <br /> <a class="menu" href="/group" rel="external nofollow" >是爷们儿就点下 </a>  </div>  <div style="color:#666644">    <h3>添加主机</h3>    <form method="POST" action="/userinfo">       <input type="hidden" name="csrfmiddlewaretoken" value="{{ csrf_token }}">      <input type="text" name="user">      <input type="text" name="pwd">      <input type="submit" name="添加">    </form>    <h3>主机列表</h3>    <ul>      {% for i in userlist2 %}        <li><a href="/datail" rel="external nofollow" >{{ i.username }}</a>        <span>{{ i.user_group.caption }}</span>        </li>      {% endfor %}    </ul>  </div></div></body></html>

然后添加url: