11.28wu

 

• 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 flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config

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

# class SQLALchemy(object):
#     pass



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(20))


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


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

        return redirect(url_for('daohang'))

    @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()
            if user:
                return 'username existed'
            else:
                user = User(username=username, password=password)
                db.session.add(user)
                db.session.commit()
                return redirect(url_for('login'))

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


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


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

from functools import araps
import config
app = Flask(_name_)
app.config.from_object(config)
db =SQLALchemy(app)
class User(db.Model)
    _table_name ='user'
    id = db Column(db.Integer.prinary_key=true,autoincrenent=true)
    username = db.Columa(db.String(20),nullable=False)
    password = db.Columa(db.String(20), nullable=False)
    nickname = db.Columa(db.String(50))

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'))

 

{% block main %}
    <p>{{ username }},welcome</p>
    <div class="label0">
        <h1>发布问答</h1>
        <form action="{{ url_for('question') }}" method="post" >
            <div class="q1">
                <label for="question" >问题</label>
                <textarea id="question" cols="50" rows="1" name="title" id="title"></textarea>
            </div>
            <div class="form-group">
                <label for="questionDetail">详情</label>
                <textarea class="form-control" id="questionDetail" cols="50" rows="5" name="detail" id="detail"></textarea>
            </div>
            <div id="error_box"><br></div>
            <div class="input-area">
                <input type="submit" value="立即发布"></input>
            </div>
        </form>
    </div>
{% endblock %}