Flask快速玩框架

from flask import Flask, render_template, session, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_moment import Moment
from datetime import datetime
from flask_wtf import Form
from wtforms import StringField, SubmitField
from wtforms.validators import Required
from flask_sqlalchemy import SQLAlchemy
from flask_script import Manager
import os
basedir = os.path.abspath(os.path.dirname(__file__))
app = Flask(__name__)
#wtf表单验证
app.config[‘SECRET_KEY‘] = ‘hard to guess string‘
#数据库URL
app.config[‘SQLALCHEMY_DATABASE_URI‘] = \
    ‘sqlite:///‘ + os.path.join(basedir, ‘data.sqlite‘)
#每次请求结束后自动提交数据变动
app.config[‘SQLALCHEMY_COMMIT_ON_TEARDOWN‘] = True
bootstrap = Bootstrap(app)
moment = Moment(app)
db = SQLAlchemy(app)
manager = Manager(app)
#wtf表单类
class NameForm(Form):
    name = StringField(‘What is your name?‘, validators=[Required()])
    submit = SubmitField(‘Submit‘)
#数据库中的table类
class Role(db.Model):
    __tablename__ = ‘roles‘
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), unique=True)
    users = db.relationship(‘User‘, backref=‘role‘, lazy=‘dynamic‘)
    def __repr__(self):
        return ‘<Role %r>‘ % self.name
class User(db.Model):
    __tablename__ = ‘users‘
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, index=True)
    role_id = db.Column(db.Integer, db.ForeignKey(‘roles.id‘))
    def __repr__(self):
        return ‘<User %r>‘ % self.username
#主页
@app.route(‘/‘, methods=[‘GET‘, ‘POST‘])
def index():
    form = NameForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.name.data).first()
        if user is None:
            user = User(username=form.name.data)
            db.session.add(user)
            session[‘known‘] = False
        else:
            session[‘known‘] = True
            session[‘name‘] = form.name.data
            form.name.data = ‘‘
            return redirect(url_for(‘index‘))
    return render_template(‘user.html‘, form=form, name=session.get(‘name‘), known=session.get(‘known‘, False),
                           current_time=datetime.utcnow())
#404页
@app.errorhandler(404)
def page_not_found(e):
    return render_template(‘404.html‘), 404
#500页
@app.errorhandler(500)
def internal_server_error(e):
    return render_template(‘500.html‘), 500
#manager.run() 用于是服务器在命令行运行
if __name__ == ‘__main__‘:
    app.run(debug=True)
    # manager.run()

<!-- 基于bootstrap/base.html的基模板 默认有导航栏 page——content可重写-->
{% extends "bootstrap/base.html" %}
<!-- 导入moment.js -->
{% block scripts %}
    {{ super() }}
    {{ moment.include_moment() }}
{% endblock %}
{% block title %}Flasky{% endblock %}
{% block head %}
    {{ super() }}
    <link rel="shortcut icon" href="{{ url_for(‘static‘, filename = ‘favicon.ico‘) }}"
          type="image/x-icon">
    <link rel="icon" href="{{ url_for(‘static‘, filename = ‘favicon.ico‘) }}"
          type="image/x-icon">
{% endblock %}
{% block navbar %}
    <div class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle"
                        data-toggle="collapse" data-target=".navbar-collapse">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <a class="navbar-brand" href="/">Flasky</a>
            </div>
            <div class="navbar-collapse collapse">
                <ul class="nav navbar-nav">
                    <li><a href="/">Home</a></li>
                </ul>
            </div>
        </div>
    </div>
{% endblock %}
{% block content %}
    <!-- 弹出警告信息-->
    <div class="container">
        {% for message in get_flashed_messages() %}
            <div class="alert alert-warning">
                <button type="button" class="close" data-dismiss="alert">×</button>
                {{ message }}
            </div>
        {% endfor %}
        {% block page_content %}{% endblock %}
    </div>
{% endblock %}

<!DOCTYPE html>
{% extends "base.html" %}
{% block title %}Flasky - Page Not Found{% endblock %}
{% block page_content %}
    <div class="page-header">
        <h1>Not Found</h1>
    </div>
{% endblock %}