model M
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import time
# 以下都是套路
app = Flask(__name__)
app.secret_key = 'secret key'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
# 指定数据库的路径
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///todos.db'
db = SQLAlchemy(app)
# 定义一个 Model，继承自 db.Model
class Todo(db.Model):
__tablename__ = 'todos'
# 下面是字段定义
id = db.Column(db.Integer, primary_key=True)
task = db.Column(db.String())
created_time = db.Column(db.Integer, default=0)
def __repr__(self):
return u'<ToDo {} {}>'.format(self.id, self.task)
def save(self):
db.session.add(self)
db.session.commit()
def delete(self):
db.session.delete(self)
db.session.commit()
def __init__(self, form):
self.task = form.get('task', '')
self.created_time = int(time.time())
def valid(self):
return len(self.task) > 0
class User(db.Model):
__tablename__ = 'users'
# 下面是字段定义
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String())
password = db.Column(db.String())
created_time = db.Column(db.Integer, default=0)
def __repr__(self):
return u'<User {} {}>'.format(self.id, self.username)
def save(self):
db.session.add(self)
db.session.commit()
def delete(self):
db.session.delete(self)
db.session.commit()
def __init__(self, form):
self.username = form.get('username', '')
self.password = form.get('password', '')
self.created_time = int(time.time())
def valid(self):
return len(self.username) > 2 and len(self.password) > 2
def validate_login(self, u):
return u.username == self.username and u.password == self.password
def change_password(self, password):
if len(password) > 2:
self.password = password
self.save()
return True
else:
return False
if __name__ == '__main__':
# 先 drop_all 删除所有数据库中的表
# 再 create_all 创建所有的表
db.drop_all()
db.create_all()
print('rebuild database')
C CONTROLER
from flask import render_template
from flask import request
from flask import redirect
from flask import url_for
from flask import Blueprint
from flask import abort
from flask import session
from models import User
# 创建一个 蓝图对象 并且路由定义在蓝图对象中
# 然后在 flask 主代码中「注册蓝图」来使用
# 第一个参数是蓝图的名字，第二个参数是套路
main = Blueprint('user', __name__)
def current_user():
uid = session.get('user_id')
if uid is not None:
u = User.query.get(uid)
print('query 速度嫩三', User.query)
# User.quert就是 user 所有参数,hahah,懂了
return u
@main.route('/')
def login_view():
u = current_user()
if u is not None:
return redirect('/todo')
return render_template('user_login.html')
@main.route('/user/register', methods=['POST'])
def register():
form = request.form
u = User(form)
if u.valid():
u.save()
else:
abort(400)
# 蓝图中的 url_for 需要加上蓝图的名字，这里是 user
return redirect(url_for('.login_view'))
@main.route('/user/login', methods=['POST'])
def login():
form = request.form
u = User(form)
# 检查 u 是否存在于数据库中并且 密码用户 都验证合格
user = User.query.filter_by(username=u.username).first()
if user is not None and user.validate_login(u):
print('登录成功')
session['user_id'] = user.id
else:
print('登录失败')
# 蓝图中的 url_for 需要加上蓝图的名字，这里是 user
return redirect(url_for('.login_view'))
@main.route('/user/update', methods=['POST'])
def update():
u = current_user()
password = request.form.get('password', '123')
if u.change_password(password):
print('修改成功')
else:
print('用户密码修改失败')
return redirect('/user/profile')
@main.route('/user/profile', methods=['GET'])
def profile():
u = current_user()
if u is not None:
print('profile', u.id, u.username, u.password)
return render_template('profile.html', user=u)
else:
abort(401)
V 可视化
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册与登录</title>
</head>
<body>
<form action="/user/register" method="post">
<input name="username">
<br>
<input name="password">
<button>注册</button>
</form>
<form action="/user/login" method="post">
<input name="username">
<br>
<input name="password">
<button>登录</button>
</form>
</body>
</html>
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