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djange表操作和ajax

路由系统:
1. /index/ -> def index(request)
2.
/detail-(\d+)/ -> def detail(request,nid)
/detail-(?P<nid>\d+)/ -> def detail(request,nid)

3.
/index/ -> def index(request) name=n1
使用别名生成URL:
模板语言: {% url n1 %} -> /index/
视图函数:
reverse(name="n1") -> /index/

4.

/web/ include("app01.urls")
视图函数:
1. 函数至少一个参数
2. request
request.method
request.GET
request.POST (请求头:Content-Type:application/x-www-form-urlencoded; charset=UTF-8)
request.body
request.FILES
...
3.
return HttpResponse(..)
return render()
return redirect()

模板引擎:

1. 基本语法

return renderI(request, ‘xxx.html‘, {‘v‘: [1,2,3,4],‘d‘:{‘k1‘:‘v1‘,‘k2‘:‘v2‘} })

xxx.html
{{v.2}}

{% for i in d %}
{{i}} --> key
{% endfor %}


{% for k,v in d.items %}
{{k}}--{{v}}
{% endfor %}

2. 函数

Django提供函数
simple_tag
filter

ORM操作:
1. 创建表

class UserInfo(models.Model):
# nid = models.AutoField(primary_key=True) int
# nid = models.BigAutoField(primary_key=True) long
name = models.CharField(max_length=32)
pwd = models.CharField(max_length=32)




2. 操作表

q = models.UserInfo.objects.all()
Queryset = [obj(id,name,pwd),obj(id,name,pwd),obj(id,name,pwd),]


q = models.UserInfo.objects.values(‘name‘,‘pwd‘)
Queryset = [{"name":‘alex‘,‘pwd‘:123},{"name":‘alex1‘,‘pwd‘:123sfd},{"name":‘alex1‘,‘pwd‘:123sfd},]


q = models.UserInfo.objects.values_list(‘name‘,‘pwd‘)
Queryset = [(‘alex‘,123),(‘alex‘,123),(‘alex‘,123),(‘alex‘,123),]



q = models.UserInfo.objects.filter(name=‘alex‘)
[obj,]


q = models.UserInfo.objects.get(name=‘alex‘)
q = models.UserInfo.objects.filter(name=‘alex‘).first()


...




今日内容:

1. FBV和CBV

FBV:

url(r‘^index/‘, views.index),

def index(request):
print(‘.....‘)
if request.method == ‘GET‘:
pass
elif request.method == ‘POST‘:
pass
return HttpResponse(‘....‘)


CBV:
url(r‘^user/‘, views.User.as_view()),


class User(View):
def dispatch(self, request, *args, **kwargs):
print(‘before‘)
obj = super(User,self).dispatch(request, *args, **kwargs)
print(‘after‘)
return obj

def get(self,request):
print("get...")
return HttpResponse(‘...‘)

def post(self,request):
print("post...")
return HttpResponse(‘...‘)

2. ORM操作

a. 创建表
一对多
多对多
- 创建第三表:
- 自己定义第三张表 :列无限制
- ManyToManyField字段: 列限制(三)
- 无法直接,只能通过ManyToManyField字段进行间接操作

b. 操作
正向
dp
反向
userinfo
userinfo_set

3. Cookie
在浏览器上保存的简直对
应用:
可做用户登录
做投票
4. session
服务器端保存的简直对
{
asdfasdfasdf: {‘user‘:‘asdf‘,‘pws‘:‘asdf‘}

}


5. Ajax操作
#

$.ajax({
url: ‘/aj/‘, # 提交地址
type: "POST", # 提交方式
data: {uuu: u, ppp:p}, # 提交数据
dataType: "JSON",
success:function (data) { # 回调函数,登录成功后自动执行
# 将字典形式的字符串,发序列化成为字典对象(json对象)
# var data_dict = JSON.parse(data);

if(data_dict.status){
location.href = "http://www.mamicode.com/home/"
}else{
alert(data_dict.error);
}
}
})

djange表操作和ajax