4 将数据库的表数据利用模板语法展示到前端页面

wsgiref

from wsgiref.simple_server import make_server
from urls import urls
from views import error

def run(request, response):
    """
    :param request:跟请求相关的数据
    :param response: 跟响应相关的数据
    :return: 返回值就是要给前端浏览器的数据
    """
    response(\'200 OK\',[])
    # print(request)  # 自动帮我们处理了所有http协议相关的数据并组织成了一个大字典
    target_url = request.get(\'PATH_INFO\')  # /login
    # if target_url == \'/index\':
    #     return [b\'from index\']
    # elif target_url == \'/login\':
    #     return [b\'from login\']
    # 提前定义一个存储函数名的变量
    func = None
    for url_tuple in urls:  #  (\'/index\',index)
        if target_url == url_tuple[0]:
            func = url_tuple[1]  # func = index
            break
    # 需要注意可能会出现func找不到对应项
    if func:
        res = func(request)
    else:
        res = error(request)
    return [res.encode(\'utf8\')]


if __name__ == \'__main__\':
    # 监听127.0.0.1:8080 一旦有请求 立刻将第三个参数加括号调用
    server = make_server(\'127.0.0.1\', 8080, run)
    # 启动服务端
    server.serve_forever()

urls

from views import *

urls = [
    (\'/index\', index),
    (\'/login\', login),
    (\'/reg\', register),
    (\'/func\',func),
    (\'/get_time\',get_time),
    (\'/get_dict\',get_dict),
    (\'/get_user\',get_user)
]

views

def index(request):
    # return \'index页面\'
    with open(r\'templates/index.html\', \'r\', encoding=\'utf8\') as f:
        return f.read()


def login(request):
    return \'login页面\'


def error(request):
    return \'404 error\'


def register(request):
    return \'register页面\'


def func(request):
    return \'func页面\'


from datetime import datetime


def get_time(request):
    # 先获取当前时间
    ctime = datetime.now().strftime(\'%Y-%m-%d %X\')
    # 读取一个html文件
    with open(r\'templates/get_time.html\', \'r\', encoding=\'utf8\') as f:
        data = f.read()  # 字符串
    data = data.replace(\'sdjksajdkjsdjk\', ctime)
    return data


from jinja2 import Template

user = {\'username\': \'jason\', \'pwd\': 123, \'hobby\': [\'read\', \'study\']}


def get_dict(request):
    with open(r\'templates/get_dict.html\', \'r\', encoding=\'utf8\') as f:
        data = f.read()
    res = Template(data)
    temp = res.render({\'user_dict\': user})
    return temp

import pymysql
def get_user(request):
    # 1.先获取数据库表数据
    conn = pymysql.connect(
        host=\'127.0.0.1\',
        port=3306,
        user=\'root\',
        password=\'123\',
        database=\'db8\',
        charset=\'utf8\',
        autocommit=True
    )
    cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
    sql = \'select * from user\'
    cursor.execute(sql)
    data_list = cursor.fetchall()  # [{},{},{},{}]
    # 2.文件操作读取文件内容
    with open(r\'templates/get_user.html\',\'r\',encoding=\'utf8\') as f:
        data = f.read()
    # 3.jinja2模块
    res = Template(data)
    tmp = res.render({\'data_list\':data_list})
    return tmp

get_user

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">">
</head>
<body>
     <div class="container">
         <div class="row">
             <h1 class="text-center">用户数据</h1>
             <div class="col-md-8 col-md-offset-2">
                 <table class="table table-hover table-striped">
                     <thead>
                         <tr>
                             <th>编号</th>
                             <th>姓名</th>
                             <th>密码</th>
                         </tr>
                     </thead>
                     <tbody>
                     {% for user_dict in data_list %}
                          <tr>
                              <td>{{user_dict.id}}</td>
                              <td>{{user_dict.name}}</td>
                              <td>{{user_dict.pwd}}</td>
                          </tr>
                     {% endfor %}
                     </tbody>
                 </table>


             </div>
         </div>
     </div>

</body>
</html>

此时cmd增加数据，刷新也会同步增加