发布功能完成。

1.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

2.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():

3.建立发布内容的对象关系映射。

class Question(db.Model):

4.完成发布函数。

保存到数据库。

重定向到首页。

 

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config
from functools import wraps
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)
    # nickname = db.Column(db.String(50))

class Question(db.Model):
    __tablename__='wd'
    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('wd'))
db.create_all()

# 增加
# user = User(username='mis1114',password = 'mis1114',nickname='mis1114')
# db.session.add(user)
# db.session.commit()
# # 查询
# User.query.filter(User.username == 'mis1114').first()
# #修改
# user =User.query.filter(User.username =='mis1114').first()
# user.password='23456'
# print(user.username,user.password)
# db.session.commit()
# # 删除
# user =User.query.filter(User.username =='mis1114').first()
# db.session.delete(user)
# db.session.commit()


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

@app.route('/ll/',methods=['GET','POST'])
def ll():
    if request.method=='GET':
        return render_template('ll.html')
    else:
        username=request.form.get('username')
        password=request.form.get('password')
        user=User.query.filter(User.username==username,User.password==password).first()
        if user:
            session['user']=username
            session.permanent=True
            return redirect(url_for('base'))
        else:
            return u'error username or password'


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


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

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


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


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

@app.route('/wd/', methods=['GET','POST'])
@loginFirst
def wd():
    if request.method == 'GET':
        return render_template('wd.html')
    else:
        title = request.form.get('title')
        detail = request.form.get('detail')
        author_id = User.query.filter(User.username == session.get('user')).first().id
        wd = Question(title=title,detail=detail,author_id=author_id)
        db.session.add(wd)  # 数据库，添加操作
        db.session.commit()
    return redirect(url_for('base'))


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

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

{% block main %}
<form action="{{ url_for('wd') }}" method="post">
<div class="label">
    <h1 >发布问答</h1>
        <div class="form-group">
            <label for="question">标题</label>
            <textarea id="question" cols="40" rows="1" placeholder="请输入标题" name='title'></textarea>
        </div>
        <div class="form-group">
            <label for="questionDetail">内容</label>
            <textarea class="form-control" id="questionDetail" cols="50" rows="5" placeholder="请输入内容" name='detail'></textarea>
        </div>
       <br>
        <div class="input-area">
            <button onclick="fnQuestion">发布问答</button>
        </div>
    </div>


</body>
</html>
</form>
{% endblock %}