发布功能完成。

• 编写要求登录的装饰器

from functools import wraps

def loginFirst(func): #参数是函数

@wraps(func)

      def wrapper(*args, ** kwargs): #定义个函数将其返回

          #要求登录

          return func(*args, ** kwargs)

      return wrapper #返回一个函数

• 应用装饰器，要求在发布前进行登录，登录后可发布。

@app.route('/question/',methods=['GET','POST']) @loginFirst def question():

 

• 建立发布内容的对象关系映射。

class Question(db.Model):

• 完成发布函数。

保存到数据库。

重定向到首页。

{% extends 'base.html' %}
{% block title %}
发布问答
{% endblock %}
{% block head %}
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/base.css') }}">
{% endblock %}

{% block main %}
<div class="box">
     <h2>发布问题</h2>
    <div class="question">
       <label for="questionTitle">标题</label>
    <textarea id="questionTitle" rows="1"  clos="30"></textarea>
    </div>
    <div class="form-group">
       <label for="questionDetail">详情</label>
    <textarea class="form-group" id="questionDetail" rows="5"  cols="30" ></textarea>
    </div>
    <input type="radio" name="role" value="stu">Check me out<br>
    <input type="button" value="发布">
</div>
{% endblock %}

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
from functools import wraps
import config
from datetime import datetime






app = Flask(__name__)
app.config.from_object(config)
db = SQLAlchemy(app)


class User(db.Model):
    __tablename__ = 'user'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)



class Question(db.Model):
    __tablename__='question'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    title = db.Column(db.String(100),nullable=False)
    detail = db.Column(db.Text,nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    author_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    author = db.relationship('User', backref=db.backref('question'))

#db.create_all()





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

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

@app.route('/denglu/',methods=['GET','POST'])
def denglu():
    if request.method == 'GET':
        return render_template('denglu.html')
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            if user.password == passw:
                session['user'] = usern
                return redirect(url_for('index'))
            else:
                return u'password error'
        else:
            return u'username is not existed.'


@app.context_processor
def mycontext():
    usern=session.get('user')
    if usern:
        return {'username':usern}
    else:
        return {}


@app.route('/logout')
def logout():
    session.clear()
    return redirect(url_for('index'))


@app.route('/zhuce/',methods=['GET','POST'])
def zhuce():
    if request.method == 'GET':
        return render_template('zhuce.html')
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            return u'username existed'
        else:
            user1 = User(username=usern, password=passw)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('denglu'))

def loginFirst(func):
    @wraps(func)
    def wrapper(*args,**kwargs):
        if session.get('user'):
            return func(*args,**kwargs)
        else:
            return redirect(url_for('denglu'))
        return wrapper

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



if __name__ == '__main__':
    app.run(debug=True)