Django（三）

1、Django请求的生命周期
        路由系统 -> 视图函数(获取模板+数据-->渲染) -> 字符串返回给用户
 
2、路由系统
        /index/                ->  函数或类.as_view()
        /detail/(\d+)          ->  函数(参数) 或 类.as_view()（参数）
        /detail/(?P<nid>\d+)   ->  函数(参数) 或 类.as_view()（参数）
        /detail/               ->  include("app01.urls")
        /detail/    name='a1'  ->  include("app01.urls")
                               - 视图中：reverse
                               - 模板中：{% url "a1" %}
 
3、视图
    FBV：函数
        def index(request,*args,**kwargs):
            ..
 
    CBV：类
        class Home(views.View):
 
            def get(self,reqeust,*args,**kwargs):
                ..
 
    获取用户请求中的数据：
        request.POST.get
        request.GET.get
        reqeust.FILES.get()
 
        # checkbox,
        ........getlist()
 
        request.path_info
 
 
        文件对象 = reqeust.FILES.get()
        文件对象.name
        文件对象.size
        文件对象.chunks()
 
        # <form 特殊的设置></form>
 
    给用户返回数据：
        render(request, "模板的文件的路径", {'k1': [1,2,3,4],"k2": {'name': '张扬','age': 73}})
        redirect("URL")
        HttpResponse(字符串)
 
4、模板语言
        render(request, "模板的文件的路径", {'obj': 1234, 'k1': [1,2,3,4],"k2": {'name': '张扬','age': 73}})
 
    <html>
 
    <body>
        <h1> {{ obj }} </h1>
        <h1> {{ k1.3 }} </h1>
        <h1> {{ k2.name }} </h1>
        {% for i in k1 %}
            <p> {{ i }} </p>
        {% endfor %}
 
        {% for row in k2.keys %}
            {{ row }}
        {% endfor %}
 
        {% for row in k2.values %}
            {{ row }}
        {% endfor %}
 
        {% for k,v in k2.items %}
            {{ k }} - {{v}}
        {% endfor %}
 
    </body>
    </html>
 
5、ORM
    a. 创建类和字段
        class User(models.Model):
            age = models.IntergerFiled()
            name = models.CharField(max_length=10)#字符长度
 
        Python manage.py makemigrations
        python manage.py migrate
 
        # settings.py 注册APP
 
    b. 操作
        增
            models.User.objects.create(name='qianxiaohu',age=18)
            dic = {'name': 'xx', 'age': 19}
            models.User.objects.create(**dic)
 
 
            obj = models.User(name='qianxiaohu',age=18)
            obj.save()
        删
            models.User.objects.filter(id=1).delete()
        改
            models.User.objects.filter(id__gt=1).update(name='alex',age=84)
            dic = {'name': 'xx', 'age': 19}
            models.User.objects.filter(id__gt=1).update(**dic)
        查
            models.User.objects.filter(id=1,name='root')
            models.User.objects.filter(id__gt=1,name='root')
            models.User.objects.filter(id__lt=1)
            models.User.objects.filter(id__gte=1)
            models.User.objects.filter(id__lte=1)
 
            models.User.objects.filter(id=1,name='root')
            dic = {'name': 'xx', 'age__gt': 19}
            models.User.objects.filter(**dic)
 
6、获取单表单数据的三种方式(views.py )
          def business(request):
            v1 = models.Business.objects.all()
            # QuerySet ,内部元素都是对象
 
            v2 = models.Business.objects.all().values('id','caption')
            # QuerySet ,内部元素都是字典
            
            v3 = models.Business.objects.all().values_list('id','caption')
            # QuerySet ,内部元素都是元组
 
             return render(request, 'business.html', {'v1': v1,'v2': v2, 'v3': v3})
 
            特别注意
            # 获取到的一个对象，如果不存在就报错
            models.Business.objects.get(id=1)
            但可以用下面的方式来获取对象
            对象或者None = models.Business.objects.filter(id=1).first()
 
 代码示例如下：
from django.shortcuts import render, HttpResponse, redirect
from  app01 import models
import json


# Create your views here.
def business(request):
    v1 = models.Business.objects.all()

    v2 = models.Business.objects.all().values('id', 'caption', 'code')

    v3 = models.Business.objects.all().values_list('id', 'caption', 'code')

    return render(request, 'business.html', {'v1': v1, 'v2': v2, 'v3': v3})


def host(request):
    if request.method == "GET":
        v1 = models.Host.objects.filter(nid__gt=0)
        v2 = models.Host.objects.filter(nid__gt=0).values('nid', 'hostname', 'b_id', 'b__caption')
        v3 = models.Host.objects.filter(nid__gt=0).values_list('nid', 'hostname', 'b_id', 'b__caption')

        b_list = models.Business.objects.all()

        return render(request, 'host.html', {'v1': v1, 'v2': v2, 'v3': v3, 'b_list': b_list})

    elif request.method == "POST":

        h = request.POST.get('hostname')
        i = request.POST.get('ip')
        p = request.POST.get('port')
        b = request.POST.get('b_id')
        models.Host.objects.create(hostname=h,
                                   ip=i,
                                   port=p,
                                   b_id=b
                                   )
        return redirect('/host')


def test_ajax(request):

    ret = {'status': True, 'error': None, 'data': None}
    try:
        h = request.POST.get('hostname')
        i = request.POST.get('ip')
        p = request.POST.get('port')
        b = request.POST.get('b_id')
        if h and len(h) > 5:
            models.Host.objects.create(hostname=h,
                                           ip=i,
                                           port=p,
                                           b_id=b)
        else:
            ret['status'] = False
            ret['error'] = "太短了"
    except Exception as e:
        ret['status'] = False
        ret['error'] = '请求错误'
    return HttpResponse(json.dumps(ret))
views.py
from django.db import models

# Create your models here.

class Business(models.Model):
    caption = models.CharField(max_length=32)
    code = models.CharField(max_length=32)

class Host(models.Model):

    nid = models.AutoField(primary_key=True)
    hostname = models.CharField(max_length=32,db_index=True)
    ip = models.GenericIPAddressField(db_index=True)
    port = models.IntegerField()
    b = models.ForeignKey(to="Business",to_field='id')
models.py
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        .hide {
            display: none;
        }

        .shade {
            position: fixed;
            top: 0;
            right: 0;
            left: 0;
            bottom: 0;
            background: black;
            opacity: 0.6;
            z-index: 100;
        }

        .add-modal, .edit-modal, .delete-modal {
            position: fixed;
            height: 300px;
            width: 400px;
            top: 100px;
            left: 50%;
            z-index: 101;
            border: 1px solid red;
            background: white;
            margin-left: -200px;
        }
    </style>
</head>
<body>
<h1>主机列表(对象)</h1>
<div>
    <input id="add_host" type="button" value="添加"/>
</div>
<table border="1">
    <thead>
    <tr>
        <th>序号</th>
        <th>主机名</th>
        <th>IP</th>
        <th>端口</th>
        <th>业务线名称</th>
        <th>操作</th>
    </tr>
    </thead>
    <tbody>

    {% for row in v1 %}
        <tr hid="{{ row.nid }}" bid="{{ row.b_id }}">
            <td>{{ forloop.counter }}</td>
            <td>{{ row.hostname }}</td>
            <td>{{ row.ip }}</td>
            <td>{{ row.port }}</td>
            <td>{{ row.b.caption }}</td>
            <td>
                <a class="edit">编辑</a>|<a class="delete">删除</a>
            </td>
        </tr>
    {% endfor %}


    </tbody>
</table>

<h1>主机列表(字典)</h1>
<table border="1">
    <thead>
    <tr>
        <th>主机名</th>
        <th>业务线名称</th>
    </tr>
    </thead>
    <tbody>
    {% for row in v2 %}
        <tr hid="{{ row.nid }}" bid="{{ row.b_id }}">
            <td>{{ row.hostname }}</td>
            <td>{{ row.b__caption }}</td>
        </tr>
    {% endfor %}

    </tbody>
</table>
<h1>主机列表(元组)</h1>
<table border="1">
    <thead>
    <tr>
        <th>主机名</th>
        <th>业务线名称</th>
    </tr>
    </thead>
    <tbody>
    {% for row in v3 %}
        <tr hid="{{ row.0 }}" bid="{{ row.2 }}">
            <td>{{ row.1 }}</td>
            <td>{{ row.3 }}</td>
        </tr>
    {% endfor %}

    </tbody>
</table>

<div class="shade hide"></div>
<div class="add-modal hide">
    <form id="add_form" method="POST" action="/host">
        <div class="group">
            <input id="host" type="text" placeholder="主机名" name="hostname"/>
        </div>

        <div class="group">
            <input id="ip" type="text" placeholder="IP" name="ip"/>
        </div>

        <div class="group">
            <input id="port" type="text" placeholder="端口" name="port"/>
        </div>

        <div class="group">
            <select id="sel" name="b_id">
                {% for op in b_list %}
                    <option value="{{ op.id }}">{{ op.caption }}</option>
                {% endfor %}
            </select>
        </div>

        <input type="submit" value="提交"/>
        <a id="ajax_submit">悄悄提交</a>
        <input id="cancel" type="button" value="取消"/>
        <span id="erro_msg" style="color: red"></span>
    </form>
</div>

<div class="edit-modal hide">
    <form id="edit_form" method="POST" action="/host">
        <input type="text" name="nid" style="display:none"/>
        <input type="text" placeholder="主机名" name="hostname"/>
        <input type="text" placeholder="IP" name="ip"/>
        <input type="text" placeholder="端口" name="port"/>
        <select name="b_id">
            {% for op in b_list %}
                <option value="{{ op.id }}">{{ op.caption }}</option>
            {% endfor %}
        </select>
        <a id="ajax_submit_edit">确认编辑</a>
        <input id="ajax_submit_cancel" type="button" value="取消"/>
    </form>
</div>
<div class="delete-modal hide">
    <form id="delete_form" method="POST" action="/host">
        <input type="text" name="nid" style="display:none"/>
        <input type="text" placeholder="主机名" name="hostname"/>
        <input type="text" placeholder="IP" name="ip"/>
        <input type="text" placeholder="端口" name="port"/>
        <select name="b_id">
            {% for op in b_list %}
                <option value="{{ op.id }}">{{ op.caption }}</option>
            {% endfor %}
        </select>
        <a id="submit_delete">确认删除</a>
        <input id="submit_cancle" type="button" value="取消"/>
    </form>


</div>

<script src="/static/jquery-1.12.4.js"></script>
<script>
    $(function () {

        $('#add_host').click(function () {
            $('.shade,.add-modal').removeClass('hide');
        });


        $('#cancel').click(function () {
            $('.shade,.add-modal').addClass('hide');
        });

        $('#ajax_submit').click(function () {
            $.ajax({
                url: "/test_ajax",
                type: 'POST',
                //data: {'hostname': $('#host').val(), 'ip': $('#ip').val(), 'port': $('#port').val(), 'b_id': $('#sel').val()},
                data: $('#add_form').serialize(),
                success: function (data) {
                    var obj = JSON.parse(data);
                    if (obj.status) {
                        location.reload();
                    } else {
                        $('#erro_msg').text(obj.error);
                    }
                }
            })
        });

        $('.edit').click(function () {
            $('.shade,.edit-modal').removeClass('hide');

            var bid = $(this).parent().parent().attr('bid');
            var nid = $(this).parent().parent().attr('hid');

            $('#edit_form').find('select').val(bid);
            $('#edit_form').find('input[name="nid"]').val(nid);
            // 修改
            /*
             $.ajax({
             data: $('#edit_form').serialize()
             });
             */
            // modeletes.Host.objects.filter(nid=nid).update()
        });
        $('#ajax_submit_cancel').click(function () {
            $('.shade,.edit-modal').addClass('hide');
        });


        $('.delete').click(function () {
            $('.shade,.delete-modal').removeClass('hide');

            var bid = $(this).parent().parent().attr('bid');
            var nid = $(this).parent().parent().attr('hid');

            $('#delete_form').find('select').val(bid);
            $('#delete_form').find('input[name="nid"]').val(nid);
        });
        $('#submit_cancle').click(function () {
            $('.shade,.delete-modal').addClass('hide');
        });

    })
</script>

</body>
</html>
host.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <h1>业务线列表(对象)</h1>
    <ul>
        {% for row in v1 %}
            <li>{{ row.id }} - {{ row.caption }} - {{ row.code }}</li>
        {% endfor %}
    </ul>
    <h1>业务线列表（字典）</h1>
    <ul>
        {% for row in v2 %}
            <li>{{ row.id }} - {{ row.caption }}- {{ row.code }}</li>
        {% endfor %}
    </ul>
    <h1>业务线列表（元组）</h1>
    <ul>
        {% for row in v3 %}
            <li>{{ row.0 }} - {{ row.1 }}- {{ row.2 }}</li>
        {% endfor %}
    </ul>
</body>
</html>
business.html
"""s14day20 URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/1.10/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.conf.urls import url, include
    2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
"""
from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^business$', views.business),
    url(r'^host$', views.host),
    url(r'^test_ajax$', views.test_ajax),
    url(r'^app$', views.app),
    url(r'^ajax_add_app$', views.ajax_add_app),
    # url(r'^business_add', views.business),
]
url.py

 

   
7、 一对多块表操作的的三种方式(views.py )
 
def host(request):
    v1 = models.Host.objects.filter(nid__gt=0)
    # QuerySet [hostobj(ip.host,另外一个对象(..)),]
    # for row in v1:
    #     print(row.nid,row.hostname,row.ip,row.port,row.b_id,row.b.caption,row.b.code,row.b.id,sep='\t')  -->sep间隔符显示
    #     print(row.b.fk.name)  
    # return HttpResponse("Host")
    v2 = models.Host.objects.filter(nid__gt=0).values('nid','hostname','b_id','b__caption')
     特别注意：这里跨表操作只能用__(双下划线)
    # QuerySet: [ {} ]
    # print(v2)
    # for row in v2:
    #     print(row['nid'],row['hostname'],row['b_id'],row['b__caption'])
 
    v3 = models.Host.objects.filter(nid__gt=0).values_list('nid','hostname','b_id','b__caption')
    # QuerySet: [ {} ]
    # print(v2)
    return render(request, 'host.html', {'v1': v1,'v2': v2,'v3': v3})
 

8、外键：

             v = models.Host.objects.filter(nid__gt=0)
             v[0].b.caption  ---->  通过.进行跨表
 
        外键：
            class UserType(models.Model):
                caption = models.CharField(max_length=32)
              id  caption
            # 1，普通用户
            # 2，VIP用户
            # 3， 游客
 
            class User(models.Model):
                age = models.IntergerFiled()
                name = models.CharField(max_length=10)#字符长度
                # user_type_id = models.IntergerFiled() # 约束，
                user_type = models.ForeignKey("UserType",to_field='id') # 约束，
 
              name age  user_type_id     
            # 张扬  18     3
            # 张A扬 18     2
            # 张B扬 18     2
 
   9、 Ajax
 
AJAX = Asynchronous JavaScript and XML（异步的 JavaScript 和 XML）。
不是新的编程语言，而是一种使用现有标准的新方法。
最大的优点是在不重新加载整个页面的情况下，可以与服务器交换数据并更新部分网页内容。
不需要任何浏览器插件，但需要用户允许JavaScript在浏览器上执行。
 
        工作原理
               
     常用的参数：     
     var configObj = {
           method   //数据的提交方式：get和post
           url   //数据的提交路径
           async   //是否支持异步刷新，默认是true
           data    //需要提交的数据
           dataType   //服务器返回数据的类型，例如xml,String,Json等
           success    //请求成功后的回调函数
           error   //请求失败后的回调函数
        }
        实例：
        $.ajax({
            url: '/host',
            type: "POST",
            data: {'k1': 123,'k2': "root"},
            success: function(data){
                // data是服务器端返回的字符串
                var obj = JSON.parse(data);
            }
        })
 
        建议：永远让服务器端返回一个字典
 
        return HttpResponse(json.dumps(字典))
 
10、多对多：
    创建多对多：
        方式一：自定义关系表
            class Host(models.Model):
                nid = models.AutoField(primary_key=True)
                hostname = models.CharField(max_length=32,db_index=True)
                ip = models.GenericIPAddressField(protocol="ipv4",db_index=True)
                port = models.IntegerField()
                b = models.ForeignKey(to="Business", to_field='id')
            # 10
            class Application(models.Model):
                name = models.CharField(max_length=32)
            # 2
 
            class HostToApp(models.Model):
                hobj = models.ForeignKey(to='Host',to_field='nid')
                aobj = models.ForeignKey(to='Application',to_field='id')
 
            # HostToApp.objects.create(hobj_id=1,aobj_id=2)
 
        方式二：自动创建关系表
            class Host(models.Model):
                nid = models.AutoField(primary_key=True)
                hostname = models.CharField(max_length=32,db_index=True)
                ip = models.GenericIPAddressField(protocol="ipv4",db_index=True)
                port = models.IntegerField()
                b = models.ForeignKey(to="Business", to_field='id')
            # 10
            class Application(models.Model):
                name = models.CharField(max_length=32)
                r = models.ManyToManyField("Host")
 
            无法直接对第三张表进行操作
 
            obj = Application.objects.get(id=1)
            obj.name
 
            # 第三张表操作
            obj.r.add(1)
            obj.r.add(2)
            obj.r.add(2,3,4)
            obj.r.add(*[1,2,3,4])
 
            obj.r.remove(1)
            obj.r.remove(2,4)
            obj.r.remove(*[1,2,3])
 
            obj.r.clear()
 
            obj.r.set([3,5,7])
 
            # 所有相关的主机对象“列表” QuerySet
            obj.r.all()
 
 
代码示例如下：
"""s14day20 URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/1.10/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.conf.urls import url, include
    2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
"""
from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^business$', views.business),
    url(r'^host$', views.host),
    url(r'^test_ajax$', views.test_ajax),
    url(r'^app$', views.app),
    url(r'^ajax_add_app$', views.ajax_add_app),
    # url(r'^business_add', views.business),
]
url.py
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        .host-tag{
            display: inline-block;
            padding: 3px;
            border: 1px solid red;
            background-color: palevioletred;
        }
        .hide{
            display: none;
        }
        .shade{
            position: fixed;
            top: 0;
            right: 0;
            left: 0;
            bottom: 0;
            background: black;
            opacity: 0.6;
            z-index: 100;
        }
        .add-modal,.edit-modal{
            position: fixed;
            height: 300px;
            width: 400px;
            top:100px;
            left: 50%;
            z-index: 101;
            border: 1px solid red;
            background: white;
            margin-left: -200px;
        }
    </style>
</head>
<body>

    <h1>应用列表</h1>
     <div>
        <input id="add_app" type="button" value="添加" />
    </div>
    <table border="1">
        <thead>
            <tr>
                <td>应用名称</td>
                <td>应用主机列表</td>
            </tr>
        </thead>
        <tbody>
            {% for app in app_list %}
                <tr aid="{{ app.id }}">
                    <td>{{ app.name }}</td>
                    <td>
                        {% for host in app.r.all %}
                            <span class="host-tag" hid="{{ host.nid }}"> {{ host.hostname }} </span>
                        {% endfor %}
                    </td>
                    <td>
                        <a class="edit">编辑</a>
                    </td>
                </tr>
            {% endfor %}
        </tbody>
    </table>



    <div class="shade hide"></div>
    <div class="add-modal hide">
        <form id="add_form" method="POST" action="/app">
            <div class="group">
                <input id="app_name" type="text" placeholder="应用名称" name="app_name" />
            </div>
            <div class="group">
                <select id="host_list" name="host_list" multiple>
                    {% for op in host_list %}
                        <option value="{{ op.nid }}">{{ op.hostname }}</option>
                    {% endfor %}
                </select>
            </div>

            <input type="submit" value="提交" />
            <input id="add_submit_ajax" type="button" value="Ajax提交" />
        </form>


    </div>

    <div class="edit-modal hide">
        <form id="edit_form" method="POST" action="/host">
                <input type="text" name="nid" style="display:none" />
                <input type="text" placeholder="应用名称" name="app" />
                <select name="host_list" multiple>
                    {% for op in host_list %}
                        <option value="{{ op.nid }}">{{ op.hostname }}</option>
                    {% endfor %}
                </select>
            <a id="ajax_submit_edit" >确认编辑</a>
        </form>


    </div>

     <script src="/static/jquery-1.12.4.js"></script>
    <script>
        $(function(){

            $('#add_app').click(function(){
                $('.shade,.add-modal').removeClass('hide');
            });

            $('#cancel').click(function(){
                $('.shade,.add-modal').addClass('hide');
            });


            $('#add_submit_ajax').click(function(){
                $.ajax({
                    url: '/ajax_add_app',
                    // data: {'user': 123,'host_list': [1,2,3,4]},
                    data: $('#add_form').serialize(),
                    type: "POST",
                    dataType: 'JSON', // 内部
                    traditional: true,
                    success: function(obj){
                        console.log(obj);
                    },
                    error: function () {

                    }

                })
            });


            $('.edit').click(function(){

                $('.edit-modal,.shade').removeClass('hide');

                var hid_list = [];
                $(this).parent().prev().children().each(function(){
                    var hid = $(this).attr('hid');
                    hid_list.push(hid)
                });

                $('#edit_form').find('select').val(hid_list);
                // 如果发送到后台
                //
                /*
                obj = models.Application.objects.get(id=ai)
                obj.name = "新Name"
                obj.save()
                obj.r.set([1,2,3,4])
                */


            })

        })



    </script>
</body>
</html>
app.html
from django.shortcuts import render,HttpResponse,redirect
from app01 import models
import json
# Create your views here.

def business(request):
    v1 = models.Business.objects.all()
    # QuerySet
    # [obj(id,caption,code),obj(id,caption,code),obj(id,caption,code) ]

    v2 = models.Business.objects.all().values('id','caption')
    # QuerySet
    # [{'id':1,'caption': '����'},{'id':1,'caption': '����'},...]

    v3 = models.Business.objects.all().values_list('id','caption')
    # QuerySet
    # [(1������),(2,����)]
    return render(request, 'business.html', {'v1': v1,'v2': v2, 'v3': v3})

# def host(request):
#     v1 = models.Host.objects.filter(nid__gt=0)
#     # QuerySet [hostobj(ip.host,����һ������(..)),]
#     # for row in v1:
#     #     print(row.nid,row.hostname,row.ip,row.port,row.b_id,row.b.caption,row.b.code,row.b.id,sep='\t')
#     #     print(row.b.fk.name)
#     # return HttpResponse("Host")
#     v2 = models.Host.objects.filter(nid__gt=0).values('nid','hostname','b_id','b__caption')
#     # QuerySet: [ {} ]
#     # print(v2)
#     # for row in v2:
#     #     print(row['nid'],row['hostname'],row['b_id'],row['b__caption'])
#
#     v3 = models.Host.objects.filter(nid__gt=0).values_list('nid','hostname','b_id','b__caption')
#     # QuerySet: [ {} ]
#     # print(v2)
#     return render(request, 'host.html', {'v1': v1,'v2': v2,'v3': v3})

def host(request):
    if request.method == "GET":
        v1 = models.Host.objects.filter(nid__gt=0)
        v2 = models.Host.objects.filter(nid__gt=0).values('nid','hostname','b_id','b__caption')
        v3 = models.Host.objects.filter(nid__gt=0).values_list('nid','hostname','b_id','b__caption')

        b_list = models.Business.objects.all()

        return render(request, 'host.html', {'v1': v1,'v2': v2,'v3': v3,'b_list':b_list})

    elif request.method == "POST":

        h = request.POST.get('hostname')
        i = request.POST.get('ip')
        p = request.POST.get('port')
        b = request.POST.get('b_id')
        # models.Host.objects.create(hostname=h,
        #                            ip=i,
        #                            port=p,
        #                            b=models.Business.objects.get(id=b)
        #                            )
        models.Host.objects.create(hostname=h,
                                   ip=i,
                                   port=p,
                                   b_id=b
                                   )
        return redirect('/host')


def test_ajax(request):

    ret = {'status': True, 'error': None, 'data': None}
    try:
        h = request.POST.get('hostname')
        i = request.POST.get('ip')
        p = request.POST.get('port')
        b = request.POST.get('b_id')
        if h and len(h) > 5:
            models.Host.objects.create(hostname=h,
                                           ip=i,
                                           port=p,
                                           b_id=b)
        else:
            ret['status'] = False
            ret['error'] = "太短了"
    except Exception as e:
        ret['status'] = False
        ret['error'] = '请求错误'
    return HttpResponse(json.dumps(ret))


def app(request):
    if request.method == "GET":
        app_list = models.Application.objects.all()
        # for row in app_list:
        #     print(row.name,row.r.all())

        host_list = models.Host.objects.all()
        return render(request,'app.html',{"app_list": app_list,'host_list': host_list})
    elif request.method == "POST":
        app_name = request.POST.get('app_name')
        host_list = request.POST.getlist('host_list')
        print(app_name,host_list)

        obj = models.Application.objects.create(name=app_name)
        obj.r.add(*host_list)

        return redirect('/app')


def ajax_add_app(request):
    ret = {'status':True, 'error':None, 'data': None}

    app_name = request.POST.get('app_name')
    host_list = request.POST.getlist('host_list')
    obj = models.Application.objects.create(name=app_name)
    obj.r.add(*host_list)
    return HttpResponse(json.dumps(ret))
views.py

 

 

 
 知识点补充
     Forloop
django模板{%for%}中的forloop的应用
{% for k, v in data.items %}
    {{ k }}: {{ v }}
{% endfor %}
 
这里假设data.items这个列表类似：[ [a,b],[c,d],[e,f]......]这种类型。那么我们可以使用{% for key, value in data.items %}这种方式得到每个元素的列表中的值。
forloop.counter      表示当前迭代数（第几次循环）从1开始
forloop.counter0     同上，但是从0开始
forloop.first             判断此次循环是否是第一次循环，是则返回True  
forloop.parentloop  是在嵌套循环中，对父循环中的forloop对象的引用
posted @ 2016-12-22 09:39  Manger  阅读(209)  评论(0)  编辑  收藏  举报