python flask框架（表单挂库综合实现）

1.静态显示

from flask import Flask

app=Flask(__name__)

@app.route('/')

def index():
     return <h1>Hello World! </h1>

@app.route('/user/<name>')
def user(name):
    return '<h1>Hello, %s!</h1>' % name

if __name__=='__main__':

    app.run(debug=True)//如果想让别人访问则把debug=True改成host=‘0.0.0.0’

2.动态显示

3.渲染成网页利用模板base.html文件美化

from flask import Flask, render_template
from flask_script import Manager

app = Flask(__name__)

manager = Manager(app)


@app.route('/')
def index():
    return render_template('index.html')

 

@app.route('/user/<name>')
def user(name):
    return render_template('user.html', name=name)


if __name__ == '__main__':
    manager.run()

 

4.创建表单

5.挂库＋表单

from flask import Flask, render_template, session, redirect, url_for, flash
from flask_script import Manager
from flask_bootstrap import Bootstrap
from flask_moment import Moment
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import Required
from flask_sqlalchemy import SQLAlchemy



app = Flask(__name__)

#令牌加密
app.config['SECRET_KEY'] = 'hard to guess'
#挂库
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://root:viz2015@localhost:3306/datanews'
app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN'] = True

manager = Manager(app)
bootstrap = Bootstrap(app)
moment = Moment(app)
db = SQLAlchemy(app)


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

#a表单
class NameForm(FlaskForm):
    name = StringField('What is your name?', validators=[Required()])
    submit = SubmitField('Submit')


@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'), 404


@app.errorhandler(500)
def internal_server_error(e):
    return render_template('500.html'), 500


@app.route('/', methods=['GET', 'POST'])
def index():
    form = NameForm()
    if form.validate_on_submit():
        old_name = session.get('name')
        if old_name is not None and old_name != form.name.data:
            flash('Looks like you have changed your name!')
        session['name'] = form.name.data
        return redirect(url_for('index'))
    return render_template('index.html', form=form, name=session.get('name'))


if __name__ == '__main__':
    db.create_all()
    manager.run()