Django之入门 CMDB系统 (四) 增删改查

前言

作者: 何全，github地址: https://github.com/hequan2017 QQ交流群: 620176501

通过此教程完成从零入门，能够独立编写一个简单的CMDB系统。

目前主流的方法开发方式，分为2种：mvc 和 mvvc方式。本教程为 mvc 方式，即 django负责渲染html。后面会推出 mvvc(前后端分离)的入门教程。

教程项目地址: https://github.com/hequan2017/husky/

教程文档地址: https://github.com/hequan2017/husky/tree/master/doc

说明

• cbv 在视图里使用类处理请求 (下面采用这种方式，比较会抽象一点，但是会比较简洁)
• fbv 在视图里使用函数处理请求

基础设置

pycharm : 菜单栏 tools --> 选择 run manage.py task

manage.py@husky > startapp asset ##创建 asset app

具体内容请看实际页面，下面只是把重点代码 进行展示。

• settings.py 增加系统配置

import sys
INSTALLED_APPS = [
    "asset",
]

• asset/modes.py

from django.db import models

class Ecs(models.Model):
    TYPE_CHOICES = (
        ('阿里云', '阿里云'),
        ('腾讯云', '腾讯云'),
        ('华为云', '华为云'),
        ('亚马逊', '亚马逊'),
        ('其他', '其他'),
        (None,None),
    )
    hostname = models.CharField(max_length=96, verbose_name='主机名', blank=True, null=True, )
    type = models.CharField(choices=TYPE_CHOICES, max_length=16, verbose_name='主机类型', blank=True, null=True, )
    instance_id = models.CharField(max_length=64, verbose_name='实例ID', unique=True)
    instance_name = models.CharField(max_length=96, verbose_name='标签', blank=True, null=True, )
    os_name = models.CharField(max_length=64, verbose_name='系统版本', blank=True, null=True, )
    cpu = models.IntegerField(verbose_name='CPU', blank=True, null=True)
    memory = models.IntegerField(verbose_name='内存', blank=True, null=True)
    private_ip = models.GenericIPAddressField(verbose_name='内网IP', blank=True, null=True)
    public_ip = models.GenericIPAddressField(verbose_name='外网IP', blank=True, null=True)

    c_time = models.DateTimeField(auto_now_add=True, null=True, verbose_name='创建时间', blank=True)
    u_time = models.DateTimeField(auto_now=True, null=True, verbose_name='更新时间', blank=True)

    class Meta:
        db_table = "ecs"
        verbose_name = "主机"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.hostname

pycharm : 菜单栏 tools --> 选择 run manage.py task

makemigrations 生成数据文件

migrate 根据文件，执行生成表结构

• asset/form.py

from django import forms
from asset.models import Ecs

class EcsForm(forms.ModelForm):
    class Meta:
        model = Ecs
        fields = '__all__'

        widgets = {
            'type': forms.Select(
                attrs={'class': 'select2',
                       'data-placeholder': '----请选择环境----'}),
        }

        help_texts = {
            'type': '* 请选择 资产所在平台.',

        }

    def clean_type(self):
        """
        自定义验证
        :return:
        """
        type = self.cleaned_data['type']
        return type

• asset/admin.py

from django.contrib import admin
from asset.models import Ecs

admin.site.register(Ecs)

• 自定义标签处理
  • asset/templatetags/asset_filter.py

from django import template
from django.apps import apps
from asset.models import Ecs
register = template.Library()

@register.filter(name='ecs_model_choices')
def ecs_model_choices(model_name, choice_name):
    asset_app = apps.get_app_config('assets')
    return getattr(asset_app.get_model(model_name), choice_name)

@register.filter(name='ecs_type_choices')
def ecs_type_choices(value):
    return  Ecs.TYPE_CHOICES

增加

• asset/views.py

class EcsCreateView(LoginRequiredMixin, PermissionRequiredMixin, CreateView):
    """
    Ecs 创建
    """
    permission_required = ('asset.add_ecs',)
    model = Ecs
    form_class = EcsForm
    template_name = 'asset/ecs-create.html'
    success_url = reverse_lazy('asset:ecs-list')

    def get_context_data(self, **kwargs):
        context = {}
        if '__next__' in self.request.POST:  # 为了获取 点击本页之前的 浏览网页
            context['i__next__'] = self.request.POST['__next__']
        else:
            try:
                context['i__next__'] = self.request.META['HTTP_REFERER']
            except Exception as e:
                logger.error(e)
        kwargs.update(context)
        return super().get_context_data(**kwargs)

    def get_success_url(self):
        return self.request.POST['__next__']

    def form_valid(self, form):  #  保存结果 可以进行 手动 修改 再保存
        obj = form.save(commit=False)
        obj.save()
        return super().form_valid(form)

    def form_invalid(self, form):
        print(form.errors)
        """If the form is invalid, render the invalid form."""
        return self.render_to_response(self.get_context_data(form=form))

• asset/urls.py

from django.urls import path
from asset import views

app_name = "asset"

urlpatterns = [
    path('ecs-create', views.EcsCreateView.as_view(), name='ecs-create')
]

• templates/base/_js.html

• templates/base/_nav.html

                

                    {% if perms.asset.add_ecs %}   权限判断
                        

                            添加资产    ## 页面跳转
                        
                    {% endif %}
                       {% if perms.asset.view_ecs %}
                        

                            资产列表
                        
                    {% endif %}
                

• templates/asset/ecs-create.html

    

                        {% csrf_token %}
                        {% if form.non_field_errors %}
                            

                                {{ form.non_field_errors }}
                            
                        {% endif %}

                        

                            

                                
基本
                                {% bootstrap_field form.hostname layout="horizontal" %}
                                {% bootstrap_field form.type layout="horizontal" %}
                                {% bootstrap_field form.instance_id layout="horizontal" %}
                                {% bootstrap_field form.instance_name layout="horizontal" %}
                                {% bootstrap_field form.os_name layout="horizontal" %}
                                {% bootstrap_field form.cpu layout="horizontal" %}
                                {% bootstrap_field form.memory layout="horizontal" %}
                                {% bootstrap_field form.private_ip layout="horizontal" %}
                                {% bootstrap_field form.public_ip layout="horizontal" %}
                            
                        

                        
                        


                        

                            


                                {% bootstrap_button "保存" button_type="submit" button_class="btn-primary" %}

                                取消

                            
                        

                    

    {% block footer-js %}

        

    {% endblock %}

列表

• asset/views.py

def get_list(function):
    """
    列表页面  获取 搜索
    :param function: self.model
    :return:
    """

    @wraps(function)
    def wrapped(self):
        # user = self.request.user
        # groups = [x['name'] for x in self.request.user.groups.values()]
        # request_type = self.request.method
        # model = str(self.model._meta).split(".")[1]

        filter_dict = {}
        not_list = ['page', 'order_by', 'csrfmiddlewaretoken']
        for k, v in dict(self.request.GET).items():
            if [i for i in v if i != ''] and (k not in not_list):
                if '__in' in k:
                    filter_dict[k] = v
                else:
                    filter_dict[k] = v[0]

        self.filter_dict = filter_dict
        self.queryset = self.model.objects.filter(**filter_dict).order_by('-id')
        order_by_val = self.request.GET.get('order_by', '')
        if order_by_val:
            self.queryset = self.queryset.order_by(order_by_val) if self.queryset else self.queryset
        result = function(self)
        return result

    return wrapped

class EcsListView(LoginRequiredMixin, PermissionRequiredMixin, ListView):
    permission_required = ('asset.view_ecs',)
    template_name = 'asset/ecs-list.html'
    model = Ecs
    queryset = Ecs.objects.get_queryset().order_by('-id')

    @get_list  ## 处理查询
    def get_context_data(self, **kwargs):
        try:
            page = self.request.GET.get('page', 1)
        except PageNotAnInteger as e:
            page = 1
        p = Paginator(self.queryset, getattr(settings, 'DISPLAY_PER_PAGE'), request=self.request)
        ecs_list = p.page(page)

        context = {
            "ecs_list": ecs_list,
            "filter_dict": self.filter_dict  # 把查询条件返回给前端
        }

        kwargs.update(context)
        return super().get_context_data(**kwargs)

• asset/urls.py

path('ecs-list', views.EcsListView.as_view(), name='ecs-list'),

• templates.py/asset/ecs-list.html

   


        

            {% csrf_token %}
            
                {% for   row   in   ecs_list.object_list %}

                    
                {% endfor %}
                

                

                


                    
主机名
                    
主机类型

                    
实例ID
                    
标签
                    
系统版本
                    
内网IP

                    
创建时间
                    
                    
操作
                
                
                


                        

                            
{{ row.hostname }}
                        
                        

                            
{{ row.get_type_display }}
                        
                        

                            
{{ row.instance_id }}
                        
                        

                            
{{ row.instance_name }}
                        
                        

                            
{{ row.os_name }}
                        
                        

                            
{{ row.private_ip }}
                        
                        

                            
{{ row.c_time |  date:'Y-m-d' }}
                        
                        

                      {% if perms.asset.view_ecs %}
                                详情
                            {% endif %}
                            {% if perms.asset.change_ecs %}
                                编辑
                            {% endif %}
                            {% if perms.asset.delete_ecs %}
                                删除
                            {% endif %}
                        
                    

            

                         


                
            

        

                        

 {% block footer-js %}

        

更新

• asset/views.py

class EcsUpdateView(LoginRequiredMixin, PermissionRequiredMixin, UpdateView):

    permission_required = ('asset.change_ecs',)
    model = Ecs
    form_class = EcsForm
    template_name = 'asset/ecs-create.html'
    success_url = reverse_lazy('asset:ecs-list')

    def get_context_data(self, **kwargs):
        context = {}
        if '__next__' in self.request.POST:  # 为了获取 点击本页之前的 浏览网页
            context['i__next__'] = self.request.POST['__next__']
        else:
            try:
                context['i__next__'] = self.request.META['HTTP_REFERER']
            except Exception as e:
                logger.error(e)
        kwargs.update(context)
        return super().get_context_data(**kwargs)

    def get_success_url(self):
        return self.request.POST['__next__']

• asset/urls.py

    path('ecs-update-', views.EcsUpdateView.as_view(), name='ecs-update'),

• templates.py/asset/ecs-create.html 创建页面 同时也当更新页面

     {% if perms.asset.change_ecs %}
        编辑
    {% endif %}

删除

• asset/views.py

class EcsDeleteView(LoginRequiredMixin, PermissionRequiredMixin, View):

    permission_required = ('asset.delete_ecs',)
    model = Ecs

    def post(self, request):
        ret = {'status': True, 'error': None, }
        nid = self.request.POST.get('nid', None)
        self.model.objects.get(id=nid).delete()
        return HttpResponse(json.dumps(ret))

• asset/urls.py

path('ecs-delete', views.EcsDeleteView.as_view(), name='ecs-delete'),

templates.py/asset/ecs-list.html

 {% if perms.asset.delete_ecs %}
 删除
  {% endif %}

   $(function () {

                $(document).on('click', '.ecs-delete', function () {
                    var id = $(this).parent().parent().attr('id');
                    var name = $(this).parent().parent().attr('name');
                    swal({
                        title: "你确定删除",
                        text: name,
                        type: "warning",
                        showCancelButton: true,
                        confirmButtonColor: "#DD6B55",
                        confirmButtonText: "确定",
                        cancelButtonText: "取消",
                        closeOnConfirm: false
                    }, function () {
                        $.ajax({
                            url: "{% url 'asset:ecs-delete' %}",
                            type: 'POST',
                            data: {'nid': id},
                            success: function (data) {
                                var obj = JSON.parse(data);
                                if (obj.status) {
                                    swal({title: "删除", text: "已成功删除", type: "success"}, function () {
                                        window.location.reload();
                                    })
                                } else {
                                    swal("错误", "删除" + "[ " + obj.error + " ]" + "遇到错误", "error");
                                }
                            }
                        });
                    });

                });

            });

详情

• asset/views.py

class EcsDetailView(LoginRequiredMixin, PermissionRequiredMixin, DetailView):
    permission_required = ('asset.view_ecs',)
    model = Ecs
    form_class = EcsForm
    template_name = 'asset/ecs-detail.html'
    def get_context_data(self, **kwargs):
        pk = self.kwargs.get(self.pk_url_kwarg, None)
        context = {
            "ecs": self.model.objects.get(id=pk),
            "nid": pk
        }
        kwargs.update(context)
        return super().get_context_data(**kwargs)

• asset/urls.py

path('ecs-detail-', views.EcsDetailView.as_view(), name='ecs-detail'),

• templates.py/asset/ecs-list.html

    

        

        

            
主机类型:
            
{{ ecs.get_type_display }}
            
        
        

            
实例ID:
            
{{ ecs.instance_id }}
            
        
        

            
标签:
            
{{ ecs.instance_name }}
            
        

        

            
系统版本:
            
{{ ecs.os_name }}
            
        

        

            
CPU:
            
{{ ecs.cpu }}
            
        

        

            
内存:
            
{{ ecs.memory }}
            
        
        

            
内网IP:
            
{{ ecs.private_ip }}
            
        
        

            
外网IP:
            
{{ ecs.public_ip }}
            
        
        

            
创建时间:
            
{{ ecs.c_time }}
            
        
        

            
更新时间:
            
{{ ecs.u_time }}