Django简单实现创建，更新，删除的功能，外加图片的简单处理

第一个：添加条目的代码如下

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@login_required def gifts_add(request):     '''     Feeling的添加     '''     if request.user.is_authenticated():         user = request.user     else:         user = request.user     if request.method == 'POST':         form = GiftsCreateForm(request.POST, request.FILES)         if form.is_valid():             title = form.cleaned_data['title']             url_address = form.cleaned_data['url_address']             description = form.cleaned_data['description']             show = form.cleaned_data['show']             category = form.cleaned_data['category']             large_image = upload_image_file(request.FILES['large_image'], type='gifts',size_type='large',image_size=480)             middle_image = upload_image_file(request.FILES['middle_image'], type='gifts',size_type='middle',image_size=320)             small_image = upload_image_file(request.FILES['small_image'], type='gifts',size_type='small',image_size=200)             obj = Gifts( title=title, description = description, url_address = url_address, large_image = large_image, middle_image = middle_image, small_image = small_image, is_show = show,                 category_id = category, user_id = user.id, create_date = datetime.now().strftime("%Y-%m-%d %H:%I:%S"), update_date = datetime.now().strftime("%Y-%m-%d %H:%I:%S"), )             try:                 obj.save()                 return HttpResponseRedirect(reverse('accounts_gifts'))             except:                 return HttpResponseRedirect(reverse('accounts_gifts'))     else:         form = GiftsCreateForm()     return render_to_response('accounts/gifts_add.html',{'user':user,'action':'gifts', 'form':form},context_instance=RequestContext(request))

第二个：更新条目的代码

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@login_required def gifts_update(request,id):     '''     Feeling的更新     '''     if request.user.is_authenticated():         user = request.user         obj = Gifts.objects.filter(id=id,user_id=user.id).get()         if request.method == 'POST':             if request.POST['title']:                 obj.title = request.POST['title']             if request.POST['url_address']:                 obj.url_address = request.POST['url_address']             if request.POST['show']:                 obj.is_show = request.POST['show']             if request.POST['category']:                 obj.category_id = request.POST['category']             if 'large_image' in request.FILES:                 #删除文件                 delete_image_file("%s" % obj.large_image)                 #存储文件                 large_image = upload_image_file(request.FILES['large_image'], type='gifts',size_type='large',image_size=480)                 obj.large_image = large_image             if 'middle_image' in request.FILES:                 #删除文件                 delete_image_file("%s" % obj.middle_image)                 #存储文件                 middle_image = upload_image_file(request.FILES['middle_image'], type='gifts',size_type='middle',image_size=320)                 obj.middle_image = middle_image             if 'small_image' in request.FILES:                 #删除文件                 delete_image_file("%s" % obj.small_image)                 #存储文件                 small_image = upload_image_file(request.FILES['small_image'], type='gifts',size_type='small',image_size=200)                 obj.small_image = small_image             obj.save()             return HttpResponseRedirect(reverse('accounts_gifts'))         else:             show = {}             show[0] = u'显示'             show[1] = u'不显示'             category = {0:u'时尚女装',1:u'帅气男装',2:u'精品箱包'}         return render_to_response('accounts/gifts_update.html',{'user':user,'action':'gifts','obj':obj,'show':show,'category':category},context_instance=RequestContext(request))     else:         return HttpResponseRedirect(reverse('home'))

第三个：删除条目的代码：

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@login_required def gifts_delete(request,id):     '''     Feeling的删除     '''     if request.user.is_authenticated() and request.method == 'POST':         user = request.user         try:             #查找需要的Item             obj = Gifts.objects.filter(id=id, user_id=user.id).get()             delete_image_file("%s" % obj.large_image)             delete_image_file("%s" % obj.middle_image)             delete_image_file("%s" % obj.small_image)             Gifts.objects.filter(id=id,user_id=user.id).delete()             json_data = simplejson.dumps({'message':u'操作成功','status_code':1})             return HttpResponse(json_data,mimetype='application/json')         except Exception, data:             json_data = simplejson.dumps({'message':u'操作失败','status_code':0,'data':data})             return HttpResponse(json_data,mimetype='application/json')     else:         json_data = simplejson.dumps({'message':u'操作失败','status_code':0})         return HttpResponse(json_data,mimetype='application/json')

第四个:添加图片的代码

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def upload_image_file(file, type='gifts',size_type='large',image_size = 480):     '''文件上传函数,上传的文件夹一定要存在'''     if file:         size = image_size         parser = ImageFile.Parser()         for content in file.chunks():             parser.feed(content)         img = parser.close()         width, height = img.size         if width > size:             delta = width / size             height = int(height / delta)             img.thumbnail((size, height), Image.ANTIALIAS)         name, ext = os.path.splitext(os.path.basename(file.name))         name = uuid.uuid4().hex         now = datetime.now()         datetime_path = '/%s/%s/%s' % (now.year, now.month, now.day)         file_dir_path = 'upload/'+type+ '/' +size_type + datetime_path + '/'         full_file_dir_path = os.path.join(MEDIA_ROOT, file_dir_path)         #要存储的文件的名字         file_name = name + '_' + size_type +ext         #如果目录不存在则创建         if os.path.exists(full_file_dir_path) == False:             os.makedirs(full_file_dir_path,0777)         #保存到数据库的名字         save_file_name = os.path.join(file_dir_path ,file_name)         #存储到服务器的文件名字         path_name = os.path.join(full_file_dir_path, file_name)         img.save(path_name)         return(save_file_name)

第五个：删除图片的代码：

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def delete_image_file(file_path, type='gifts',size_type='large',image_size = 480):     '''     删除文件     '''     #/home/davidzhang/walkerfree/media/upload/large/T2DdJiXlXOXXXXXXXX_499983611_large_large_large_large_large.jpg     file_full_path = os.path.join(MEDIA_ROOT, file_path)     if os.path.exists(file_full_path):         if os.path.isfile(file_full_path):             #return file_full_path             os.remove(file_full_path)