Education/Python
3
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

flask readme

Browse Source
This commit is contained in:
威勝 張 2024-04-20 15:55:56 +08:00
parent bed6e764c5
commit 32f015a6c9
1 changed files with 229 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

229
Flask/README.md
View File

@ -0,0 +1,229 @@
# Flask
## 介紹
### Flask 是一個使用 Python 語言開發的輕量級 Web 應用框架。近年來因為Python簡單易學的語法以及強大的生態系統，所以在Web開發領域也逐漸受到青睞。其中Flask的哲學是保持核心簡單但擴充性強，它只提供了路由、模板、靜態檔案等最基本的功能，其他大多數功能則是通過擴展提供，這樣可以讓我們按需求選擇。
### Flask強調概念明確、低耦合度和可擴充性。和Django等全能框架不同，
##
## 程式碼說明
### 首先先以Python切入
### Python
```
# 匯入會用到的庫
from flask import Flask
from flask import render_template
from flask import Flask, request, jsonify
import threading
import requests, socket
import pymysql
# from flask_cors import CORS # 若有跨域需求再開，練習通常用不到
```
### 接著我這邊與網路上的寫法有些不同，我直接寫成物件導向的方式，實測下來沒太大問體
#### 先設定多線呈方式，及設定好資料庫連線位置
```
class Website(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.db = pymysql.connect(host='140.125.21.65', port=3307, user='VIP125', passwd='@VIPvip125', db='VIP125', charset='utf8')
self.app = Flask(__name__)
# CORS(self.app)
```
### 路由設定
#### 這邊統一教學，我設定成前後端分離的方式，將頁面與API做個區分，之後若是要單獨架設頁面或是API都可以直接修改
```
#前端顯示
self.app.add_url_rule('/', 'Index', self.Index)
self.app.add_url_rule('/next/<id>', 'Next', self.Next)
# API
self.app.add_url_rule('/api/get_data', 'get_data', self.get_data,methods=['get'])
self.app.add_url_rule('/api/get_one_data/<id>', 'get_one_data', self.get_one_data, methods=['get'])
```
### 前端頁面導向
#### 這邊提供純頁面及需要攜帶部分參數的簡單方式
```
# 前端
def Index(self):
return render_template('Index.html')
def Next(self,id): # 攜帶參數
return render_template('Next.html',id = id)
```
### 後端資料
#### 建議先看過一部份的資料庫語法後再來接觸
```
# 後端API
def get_data(self):
cursor = self.db.cursor()
sql = "select * from teaching_sql_1"
cursor.execute(sql)
data = cursor.fetchall()
print(f'ALL_data = {data}')
return jsonify(data)
def get_one_data(self,id):
cursor = self.db.cursor()
sql = f"SELECT * FROM teaching_sql_1 WHERE student_id='{id}';"
print(sql)
cursor.execute(sql)
data = cursor.fetchall()
print(f'user_id = {data}')
return jsonify(data)
```
### 完整程式
```
from flask import Flask
from flask import render_template
from flask import Flask, request, jsonify
import threading
import requests, socket
import pymysql
# from flask_cors import CORS
class Website(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.db = pymysql.connect(host='140.125.21.65', port=3307, user='VIP125', passwd='@VIPvip125', db='VIP125',
charset='utf8')
self.app = Flask(__name__)
# CORS(self.app)
#前端顯示
self.app.add_url_rule('/', 'Index', self.Index)
self.app.add_url_rule('/next/<id>', 'Next', self.Next)
# API
self.app.add_url_rule('/api/get_data', 'get_data', self.get_data,methods=['get'])
self.app.add_url_rule('/api/get_one_data/<id>', 'get_one_data', self.get_one_data, methods=['get'])
def run(self):
#self.app.run()
self.app.run(host="0.0.0.0", port="5500")
# 前端
def Index(self):
return render_template('Index.html')
def Next(self,id): # 攜帶參數
return render_template('Next.html',id = id)
# 後端API
def get_data(self):
cursor = self.db.cursor()
sql = "select * from teaching_sql_1"
cursor.execute(sql)
data = cursor.fetchall()
print(f'ALL_data = {data}')
# 返回 JSON 响应
return jsonify(data)
def get_one_data(self,id):
cursor = self.db.cursor()
sql = f"SELECT * FROM teaching_sql_1 WHERE student_id='{id}';"
print(sql)
cursor.execute(sql)
data = cursor.fetchall()
print(f'user_id = {data}')
return jsonify(data)
if __name__ == '__main__':
website = Website()
website.run()
```
### 前端(HTML)
#### 這邊就以基礎的HTML與JS進行
#### 有簡單的利用AJAX去撈資料、頁面跳轉
#### Index.html
```
<!DOCTYPE html>
<html lang="en">
<head>
<title>Flask HTML CSS Example</title>
<link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
<link rel="stylesheet" href="{{ url_for('static', filename='lib/bootstrap/dist/css/bootstrap.min.css') }}"/>
<link rel="stylesheet" href="{{ url_for('static', filename='css/site.css') }}" asp-append-version="true"/>
<script src="{{ url_for('static', filename='js/script.js') }}"></script>
<script src="{{ url_for('static', filename='js/site.js') }}"></script>
<script src="{{ url_for('static', filename='lib/bootstrap/dist/js/bootstrap.bundle.min.js') }}"></script>
<script src="{{ url_for('static', filename='lib/jquery/dist/jquery.min.js') }}" asp-append-version="true"></script>
</head>
<body>
<h1>Flask</h1>
<div class="size2">
<div>
Hello World!
</div>
<input type="text" id="value_id" />
<button onclick="next_clicked()">下一頁</button>
<button onclick="get_data()">獲取資料</button>
</div>
</body>
</html>
<script>
function next_clicked(){
var id = document.getElementById("value_id").value
window.location = "/next/" + id;
}
function get_data(){
$.ajax({
type: "GET",
url: "/api/get_data",
data: {},
contentType: "application/json",
success: function (Model) {
console.log(Model)
//set_data(Model)
}
});
}
</script>
```
#### Next.html
```
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<input id="value_id" value='{{ id }}' />
<br>
<button onclick="Index_clicked()">首頁</button>
</body>
</html>
<script>
function Index_clicked(){
window.location = "/";
}
</script>
```