From 9bd89e6708836ca4efe51abfe86f156a8e696e02 Mon Sep 17 00:00:00 2001
From: leo <leo890808678@gmail.com>
Date: Sat, 20 Apr 2024 15:54:18 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=20Flask?=
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-歡迎使用 Wiki！
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+# 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>
+```
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