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。

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

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__='fabu'
    id=db.Column(db.Integer,primary_key=TabError,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('fabu'))

#创建表格
#db.create_all()

#数据的添加方法
#user=User(username='kobe24',password='666666')
#db.session.add(user)
#db.session.commit()

#数据的查询方法
#user=User.query.filter(User.username =='kobe24').first()
#print(user.username,user.password)

# 数据的修改方法
#user = User.query.filter(User.username=='kobe24').first
#user.password='123456'
#db.session.commit()

# 数据的删除方法
#user = User.query.filter(User.username=='kobe24').first()
#db.session.delete(user)
#db.session.commit()

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

@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        username = request.form.get('username')  # 获取form中的数据
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            if user.password == password:
                session['user'] = username
                session.permanent = True
                return redirect(url_for('base'))  # 返回到首页
        else:
            return u'error username or password'  # 输出错误

@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method == 'GET':
        return render_template('regist.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        # 判断用户名是否存在
        if user:
            return u'username existed'
        else:
            user = User(username=username, password=password)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))

@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'))

# 进入问答界面先登录功能
def loginFirst(func):
    @wraps(func)
    def wrapper(*args,**kwargs):
        if session.get('user'):
            return func(*args,**kwargs)
        else:
            return redirect(url_for('login'))
    return wrapper


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

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

{% extends'base.html' %}

{% block fabutitle %}{% endblock %}

{% block fabuhead %}{% endblock %}

{% block fabumain %}
    <div class="form-group">
    <h1>发布问答</h1>
    <form action="{{ url_for('fabu') }}" method="post">
        <label for="questionDetail">问题</label><br>
        <textarea class="form-control" rows="1" cols="50" id="questionDetail"></textarea><br>
    <label for="questionDetail">详情</label><br>
  <textarea class="form-control" rows="5" cols="50" id="questionDetail"></textarea><br>
     <button type="button">发布问答</button>
        </form>
    </div>
{% endblock %}