Django学习笔记第九篇--实战练习五--关于数据的改、删操作、数据库字段属性的设置和类视图

一、首先上代码、关于类视图：

 class register(View):
     #template_name = "templates/register.html"
     def get(self,request):
         return render_to_response("register.html")
     def post(self,request):
         username = request.POST.get("user")
         password = request.POST.get("pswd")
         emailstr = request.POST.get("email")
         if None in [username,password,emailstr]:
             return HttpResponseRedirect("/myapp1/register")
         else:
             password = gethash(password)
         gender = request.POST.get("gender")
         if gender not in [u"M",u"F"] and gender != None:
             return HttpRequestRedirect("/myapp1/register")
         userroll = int(request.POST.get("roll"))
         if userroll not in [0,1] and userroll != None:
             return HttpResponseRedirect("/myapp1/register")
         try:
             if userroll != None and gender != None:
                 LoginUser.objects.create(username=username,password=password,emailstr=emailstr,gender=gender,userroll=userroll)
             elif userroll == None and gender != None:
                 LoginUser.objects.create(username=username,password=password,emailstr=emailstr,gender=gender)
             else:
                 LoginUser.objects.create(username=username,password=password,emailstr=emailstr)
         except Exception,ex:
             print ex
             return HttpResponseRedirect("/myapp1/register")
         return HttpResponseRedirect("/myapp1/login")

要注意的是在对应urls.py的配置文件应该这么写：

 from django.conf.urls import include, url
 from django.contrib import admin
 from myapp1 import views 

 urlpatterns = [
     # Examples:
     # url(r'^$', 'mysite1.views.home', name='home'),
     # url(r'^blog/', include('blog.urls')),

     url(r'^admin/', include(admin.site.urls)),
     #url(r'^captcha/', include(captcha.urls)),
     url(r'^myapp1/', include("myapp1.urls")),
     #url(r'^register/',views.register.as_view())
 ]

 from django.conf.urls import include, url
 from myapp1 import views
 #from myapp1.views import AccountRegister

 urlpatterns = [
     # Examples:
     # url(r'^$', 'mysite1.views.home', name='home'),
     # url(r'^blog/', include('blog.urls')),
     url(r'^login/', "myapp1.views.login"),
     url(r'^mainpage/', "myapp1.views.main"),
     url(r'^verifycode/', "myapp1.views.verify"),
     url(r'^update/', "myapp1.views.update"),
     url(r'^register/',views.register.as_view()),#注意没有引号没有引号没有引号
 ]

然后就可以啦，是不是很简单呢！

二、关于数据的更新和删除操作：

 @logincheck.login_need
 def update(request):
     if request.method != 'POST':
         return render_to_response("update.html")
     else:
         username = request.POST["user"]
         password = request.POST["pswd"]
         emailstr = request.POST["email"]
         gender = request.POST["gender"]
         if None in [username,password,emailstr]:
             return render_to_response("update.html")
         else:
             password = gethash(password)
             try:
                 print type(gender)
                 print repr(gender)
                 if gender in [u"M",u"F"]:
                     LoginUser.objects.filter(username=username,password=password,emailstr=emailstr).update(gender=gender)
                 else:
                     return render_to_response("update.html")
             except Exception,ex:
                 return render_to_response("update.html")
             return HttpResponseRedirect("/myapp1/mainpage?name=%s"%username)

核心代码部分：

 LoginUser.objects.filter(username=username,password=password,emailstr=emailstr).update(gender=gender)

如果是删除就是这样啦：

 LoginUser.objects.filter(username=username,password=password,emailstr=emailstr).delete()

三、关于一些约束条件：

 #1、自增主键：
 id = models.AutoField(primary_key=True)
 #2、非空
 blank=False
 #3、唯一
 unique=True
 #4、默认值:
 default= xxx

四、关于选项的数据库字段类型：

 class LoginUser(models.Model):
     gender_type = (
         (u"F",u"female"),
         (u"M",u"male")
     )
     userroll = models.IntegerField(default=1)
     username = models.CharField(max_length=20)
     password = models.CharField(max_length=64)
     emailstr = models.CharField(max_length=50)
     gender = models.CharField(max_length=1,choices=gender_type,default="M")