flask数据库操作（flask_sqlalchemy）
Posted 月疯
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from flask import Flask,request,render_template
from flask_sqlalchemy import SQLAlchemy
import os
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)
class User(db.Model):
id = db.Column(db.Integer,primary_key=True,autoincrement=True)
username = db.Column(db.String(32),unique=True,nullable=False)
password = db.Column(db.String(32),nullable=False)
if os.path.exists(os.path.join(os.path.dirname(__file__),'test.db')):
db.create_all()
@app.route('/')
def hello_word():
users = User.query.all()
return render_template('index.html',users = users)
@app.route('/add_user',methods=['GET','POST'])
def add_user():
if request.method == 'GET':
return render_template('add_user.html')
elif request.method == 'POST':
username = request.form.get('username')
password = request.form.get('password')
user = User()
user.username = username
user.password = password
try:
db.session.add(user)
db.session.commit()
return '添加成功'
except Exception:
return '添加失败'
@app.route('/delete_user/<int:userid>')
def delete_user(userid):
user = User.query.get(userid)
try:
db.session.delete(user)
db.session.commit()
return '删除成功'
except Exception:
return '删除失败'
if __name__ == '__main__':
app.run()
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用户展示</title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<table class="table table-striped">
<tr>
<th>用户名</th>
<th>密码</th>
<th>删除操作</th>
</tr>
% for user in users %
<tr>
<td>
user.username
</td>
<td>
user.password
</td>
<td><a href=" url_for('delete_user',userid = user.id) ">删除</a></td>
</tr>
% endfor %
</table>
</body>
</html>add_user.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>添加用户</title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<form action="add_user" method="post">
<div class="form-group">
<label for="username">用户名</label>
<input type="text" name="username" id="username" class="form-control">
</div>
<div class="form-group">
<label for="password">密码</label>
<input type="password" name="password" id="password" class="form-control">
</div>
<input type="submit" name="提交" class="btn btn-default">
</form>
</body>
</html>
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