Log function and database validation:

Import the render django.shortcuts from, the HttpResponse, the redirect 
Import pymysql 

# here Wallpaper the Create your views. 

DEF index (Request): 
    Print (request.path_info) 
    return the HttpResponse ( '<h1 of> index </ h1 of>') 
    # return the render (Request, 'index.html') 

DEF Modal (request): 
    return the render (request, 'modal.html') 

DEF the Login (request): 
    # determine if a get request to return the login page: 
    IF request.method == "GET": 
        return the render (request, "login.html") 
    # otherwise handle post requests, submit the data acquisition: 
    the else: 
        Print (request.POST) 
        # obtain a user name: 
        username = request.POST.get ( "the user") 
        password = request.POST .get ( "password") 
        # Username and password verification:
        conn = pymysql.connect ( user="root", password="123", db="alex", charset="utf8" )
        cursor = conn.cursor ()
        ret = cursor.execute ( "select * from user where username = %s and password = %s",(username,password))
        if ret:
            #登录成功：
            return redirect("/index/")
        else:
            return render(request,"login.html",{"error":"用户名或密码错误"})