python学习第十九天

Posted 2020-09-09

Django

获取一个项目的多个数据  request.POST.getlist(‘favor‘)

上传文件  

import os

obj =request.FILES.get(‘‘)

file_path =os.path.join(‘upload‘,obj.name)

with open(file_path,‘wb‘) as f:

    for i in obj.chunks():

        f.write(i)

 

FBV function base view

 

CBV class base view

url对应关系  url(r‘^up‘, views.Up.as_view())

from django.views import View

class Up(View):

    def dispatch(self, request, *args, **kwargs):

        print(‘before‘)

        result =super(Up,self).dispatch(request, *args, **kwargs)  继承父类的dispatch方法，dispatch方法负责识别用户数据发送方式

        print(‘after‘)

        return result

    def get(self,request):

        return render(request, ‘upload.html‘)

    def post(self,request):

        obj = request.FILES.get(‘file‘)

        file_path = os.path.join(‘upload‘, obj.name)

        with open(file_path, ‘wb‘) as f:

            for i in obj.chunks():

                f.write(i)

        return render(request, ‘upload.html‘)

 

模板语言循环字典

{% for row in user_dict.keys(.values;.items) %}  .keys .values .items 循环列表元素，一个参数循环时以元组形式返回，两个参数循环时分别对两个参数赋值

{% endfor %}

 

Django正则URL

URL动态对应

url(r‘^detail-(\\d+).html‘, views.detail) 顺序赋值

url(r‘^detail-(?p<nid>\\d+)-(?p<uid>\\d+).html‘, views.detail) 固定赋值

 

url(r‘^index‘, views.Index,name=‘index‘)

<form action="{% url ‘index‘ %}"></form> 自动对应URL

<form action="{% url ‘index‘ 3 %}"></form> 跳转到指定URL

<form action="{% url ‘index‘ nid=3 %}"></form> 跳转到指定URL

<form action="{{request.path_info}}"></form> 自动对应URL

 

from django.urls import reverse

v =reverse(‘index‘,args=(90,)) 生成指定url

v =reverse(‘index‘,kwargs=(‘nid‘=90,)) 生成指定url

 

URL分发

from django.conf.urls import include

url(r‘^cmdb/‘, include("cmdb.urls"))  先匹配url中的cmdb，然后在cmdb的urls文件中匹配对应函数

 

Django连接Mysql

DATABASES ={‘default‘:{‘ENGINE‘:‘django.db.backends.mysql‘,‘NAME‘:‘dbname‘,‘USER‘:‘root‘,‘PASSWORD‘:‘‘,‘HOST‘:‘‘,‘PORT‘:‘‘,}}

python3中需要在django的app目录下的__init__.py文件中添加如下两行代码

import pymysql
pymysql.install_as_MySQLdb()

 

创建表

class UserInfo(models.Model):
    username =models.CharField(max_length=32)
    password =models.CharField(max_length=64)

 

添加数据

1 models.UserInfo.objects.create(username=‘root‘,password=‘123‘)

2 dict ={‘username‘:‘jack‘,‘password‘:‘123‘}

models.UserInfo.objects.create(**dict)

3 obj =models.UserInfo(username=‘root‘,password=‘123‘)

obj.save()

 

查询

models.UserInfo.objects.all() 获取表中所有数据

models.UserInfo.objects.filter(条件,条件)

 

删除

models.UserInfo.objects.filter(条件,条件).delete()

 

修改

models.UserInfo.objects.filter(条件,条件).update(password=‘123’)

 

django ORM字段类型以及参数

http://www.cnblogs.com/wupeiqi/articles/5246483.html

 

user_type_choices =((1,‘超级用户‘),(2,‘普通用户‘),)

user_type_id =models.ItegerField(choices=user_type_choices)

 

添加外键

user_group =models.ForeignKey("UserGroup",to_filed=‘uid‘)