如何利用MySQL和Python開(kāi)發(fā)一個(gè)簡(jiǎn)單的在線(xiàn)訂餐系統(tǒng)
隨著互聯(lián)網(wǎng)的快速發(fā)展,越來(lái)越多的人選擇在線(xiàn)訂餐來(lái)解決日常的飲食需求。為了滿(mǎn)足用戶(hù)的需求,許多公司開(kāi)發(fā)了各式各樣的在線(xiàn)訂餐系統(tǒng)。本文將介紹如何使用MySQL和Python來(lái)開(kāi)發(fā)一個(gè)簡(jiǎn)單的在線(xiàn)訂餐系統(tǒng),并提供具體的代碼示例。
首先,我們需要?jiǎng)?chuàng)建一個(gè)MySQL數(shù)據(jù)庫(kù)來(lái)存儲(chǔ)菜單信息、用戶(hù)信息以及訂單信息。可以使用以下SQL語(yǔ)句創(chuàng)建相應(yīng)的表:
CREATE TABLE IF NOT EXISTS `menu` ( `id` INT AUTO_INCREMENT PRIMARY KEY, `name` VARCHAR(100) NOT NULL, `price` DECIMAL(10,2) NOT NULL ); CREATE TABLE IF NOT EXISTS `users` ( `id` INT AUTO_INCREMENT PRIMARY KEY, `username` VARCHAR(100) NOT NULL, `password` VARCHAR(100) NOT NULL ); CREATE TABLE IF NOT EXISTS `orders` ( `id` INT AUTO_INCREMENT PRIMARY KEY, `user_id` INT NOT NULL, `menu_id` INT NOT NULL, `quantity` INT NOT NULL, `date` DATE NOT NULL );
登錄后復(fù)制
接下來(lái),我們使用Python和MySQL連接庫(kù)來(lái)實(shí)現(xiàn)數(shù)據(jù)庫(kù)的連接和操作。以下是MySQL連接的代碼示例:
import mysql.connector
# 連接MySQL數(shù)據(jù)庫(kù)
def connect_db():
conn = mysql.connector.connect(
host="localhost",
user="your_username",
password="your_password",
database="your_database"
)
return conn
# 查詢(xún)菜單
def get_menu():
conn = connect_db()
cursor = conn.cursor()
cursor.execute("SELECT * FROM menu")
menu = cursor.fetchall()
cursor.close()
conn.close()
return menu
# 用戶(hù)注冊(cè)
def register(username, password):
conn = connect_db()
cursor = conn.cursor()
cursor.execute("INSERT INTO users (username, password) VALUES (%s, %s)", (username, password))
conn.commit()
cursor.close()
conn.close()
# 用戶(hù)登錄
def login(username, password):
conn = connect_db()
cursor = conn.cursor()
cursor.execute("SELECT * FROM users WHERE username = %s AND password = %s", (username, password))
user = cursor.fetchone()
cursor.close()
conn.close()
return user
# 下訂單
def place_order(user_id, menu_id, quantity, date):
conn = connect_db()
cursor = conn.cursor()
cursor.execute("INSERT INTO orders (user_id, menu_id, quantity, date) VALUES (%s, %s, %s, %s)", (user_id, menu_id, quantity, date))
conn.commit()
cursor.close()
conn.close()
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現(xiàn)在我們已經(jīng)可以從數(shù)據(jù)庫(kù)中查詢(xún)菜單、實(shí)現(xiàn)用戶(hù)注冊(cè)和登錄以及下訂單了。
為了讓用戶(hù)能夠使用在線(xiàn)訂餐系統(tǒng),我們需要一個(gè)簡(jiǎn)單的用戶(hù)界面。以下是使用Python的Flask庫(kù)來(lái)實(shí)現(xiàn)一個(gè)簡(jiǎn)單的網(wǎng)頁(yè)界面的代碼示例:
from flask import Flask, render_template, request
app = Flask(__name__)
# 用戶(hù)界面
@app.route("/")
def index():
menu = get_menu()
return render_template("index.html", menu=menu)
# 用戶(hù)注冊(cè)
@app.route("/register", methods=["GET", "POST"])
def register_page():
if request.method == "POST":
username = request.form["username"]
password = request.form["password"]
register(username, password)
return render_template("success.html")
return render_template("register.html")
# 用戶(hù)登錄
@app.route("/login", methods=["GET", "POST"])
def login_page():
if request.method == "POST":
username = request.form["username"]
password = request.form["password"]
user = login(username, password)
if user:
return render_template("success.html")
else:
return render_template("login.html", error="Invalid username or password.")
return render_template("login.html")
# 下訂單
@app.route("/place_order", methods=["POST"])
def place_order_page():
user_id = request.form["user_id"]
menu_id = request.form["menu_id"]
quantity = request.form["quantity"]
date = request.form["date"]
place_order(user_id, menu_id, quantity, date)
return render_template("success.html")
if __name__ == "__main__":
app.run()
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上述代碼創(chuàng)建了一個(gè)基于Flask的簡(jiǎn)易網(wǎng)頁(yè)界面,包括主頁(yè)、用戶(hù)注冊(cè)頁(yè)、用戶(hù)登錄頁(yè)和下訂單頁(yè)。
最后,我們需要?jiǎng)?chuàng)建相應(yīng)的html模板文件來(lái)呈現(xiàn)網(wǎng)頁(yè)界面。以下是一個(gè)簡(jiǎn)單的示例:
index.html:
<!DOCTYPE html>
<html>
<head>
<title>Online Ordering System</title>
</head>
<body>
{% for item in menu %}
<h3>{{ item[1] }}</h3>
<p>Price: {{ item[2] }}</p>
<form action="/place_order" method="post">
<input type="hidden" name="user_id" value="1">
<input type="hidden" name="menu_id" value="{{ item[0] }}">
<input type="number" name="quantity" min="1" max="10" placeholder="Quantity" required>
<input type="date" name="date" required>
<button type="submit">Order</button>
</form>
<hr>
{% endfor %}
</body>
</html>
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register.html:
<!DOCTYPE html>
<html>
<head>
<title>User Registration</title>
</head>
<body>
<h2>User Registration</h2>
<form action="/register" method="post">
<input type="text" name="username" placeholder="Username" required>
<input type="password" name="password" placeholder="Password" required>
<button type="submit">Register</button>
</form>
</body>
</html>
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login.html:
<!DOCTYPE html>
<html>
<head>
<title>User Login</title>
</head>
<body>
<h2>User Login</h2>
{% if error %}
<p style="color:red;">{{ error }}</p>
{% end %}
<form action="/login" method="post">
<input type="text" name="username" placeholder="Username" required>
<input type="password" name="password" placeholder="Password" required>
<button type="submit">Login</button>
</form>
</body>
</html>
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success.html:
<!DOCTYPE html>
<html>
<head>
<title>Success</title>
</head>
<body>
<h2>Success</h2>
<p>Your order has been placed successfully.</p>
</body>
</html>
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以上就是如何利用MySQL和Python開(kāi)發(fā)一個(gè)簡(jiǎn)單的在線(xiàn)訂餐系統(tǒng)的詳細(xì)代碼示例。通過(guò)參考該示例,您可以進(jìn)一步擴(kuò)展和優(yōu)化您的在線(xiàn)訂餐系統(tǒng),以適應(yīng)實(shí)際需求。
以上就是如何利用MySQL和Python開(kāi)發(fā)一個(gè)簡(jiǎn)單的在線(xiàn)訂餐系統(tǒng)的詳細(xì)內(nèi)容,更多請(qǐng)關(guān)注www.92cms.cn其它相關(guān)文章!






