python mini-web框架-从mysql中查询数据

准备数据

1. 创建数据库

create database stock_db charset=utf8;

2. 选择数据库

use stock_db;

3. 导入数据

stock_db.sql在课件中

source stock_db.sql

4. 表结构如下

mysql> desc focus;
+-----------+------------------+------+-----+---------+----------------+
| Field     | Type             | Null | Key | Default | Extra          |
+-----------+------------------+------+-----+---------+----------------+
| id        | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| note_info | varchar(200)     | YES  |     |         |                |
| info_id   | int(10) unsigned | YES  | MUL | NULL    |                |
+-----------+------------------+------+-----+---------+----------------+
mysql> desc info;
+----------+------------------+------+-----+---------+----------------+
| Field    | Type             | Null | Key | Default | Extra          |
+----------+------------------+------+-----+---------+----------------+
| id       | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| code     | varchar(6)       | NO   |     | NULL    |                |
| short    | varchar(10)      | NO   |     | NULL    |                |
| chg      | varchar(10)      | NO   |     | NULL    |                |
| turnover | varchar(255)     | NO   |     | NULL    |                |
| price    | decimal(10,2)    | NO   |     | NULL    |                |
| highs    | decimal(10,2)    | NO   |     | NULL    |                |
| time     | date             | YES  |     | NULL    |                |
+----------+------------------+------+-----+---------+----------------+

my_web.py(更新)

import pymysql
import time
import os
import re

template_root = "./templates"

# 用来存放url路由映射
# url_route = {
#   "/index.py":index_func,
#   "/center.py":center_func
# }
g_url_route = dict()


def route(url):
    def func1(func):
        # 添加键值对，key是需要访问的url，value是当这个url需要访问的时候，需要调用的函数引用
        g_url_route[url]=func
        def func2(file_name):
            return func(file_name)
        return func2
    return func1


@route("/index.html")
def index(file_name):
    """返回index.html需要的页面内容"""
    # return "hahha" + os.getcwd()  # for test 路径问题
    try:
        file_name = file_name.replace(".py", ".html")
        f = open(template_root + file_name)
    except Exception as ret:
        return "%s" % ret
    else:
        content = f.read()
        f.close()

        # --------添加---------
        # data_from_mysql = "暂时没有数据，请等待学习mysql吧，学习完mysql之后，这里就可以放入mysql查询到的数据了"
        db = pymysql.connect(host='localhost',port=3306,user='root',password='mysql',database='stock_db',charset='utf8')
        cursor = db.cursor()
        sql = """select * from info;"""
        cursor.execute(sql)
        data_from_mysql = cursor.fetchall()
        cursor.close()
        db.close()

        content = re.sub(r"\{%content%\}", str(data_from_mysql), content)

        return content


@route("/center.html")
def center(file_name):
    """返回center.html需要的页面内容"""
    # return "hahha" + os.getcwd()  # for test 路径问题
    try:
        file_name = file_name.replace(".py", ".html")
        f = open(template_root + file_name)
    except Exception as ret:
        return "%s" % ret
    else:
        content = f.read()
        f.close()

        data_from_mysql = "暂时没有数据,,,,~~~~(>_<)~~~~ "
        content = re.sub(r"\{%content%\}", data_from_mysql, content)

        return content


def application(environ, start_response):
    status = '200 OK'
    response_headers = [('Content-Type', 'text/html')]
    start_response(status, response_headers)

    file_name = environ['PATH_INFO']
    try:
        return g_url_route[file_name](file_name)
    except Exception as ret:
        return "%s" % ret
    else:
        return str(environ) + '-----404--->%s\n'