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  • 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 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=TabError, autoincrement=True)
        username = db.Column(db.String(20), nullable=False)
        password = db.Column(db.String(20), nullable=False)
        # nickname = db.Column(db.String(20))
    
    class Post(db.Model):
        __tablename__='post'
        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('post'))
    
    db.create_all()
    
    
    
    # 查询删除
    # user = User.query.filter(User.username == 'lin').first()
    # db.session.delete(user)
    # db.session.commit()
    
    # 修改
    # user = User.query.filter(User.username == 'lin').first()
    # user.password = '1234'
    # print(user.username,user.password)
    # db.session.commit()
    
    # 增加
    # user = User(username = 'lin',password = 'lin')
    # db.session.add(user)
    # db.session.commit()
    
    db.create_all()
    
    
    @app.route('/')
    def jianshu():
        return render_template('jianshu.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')
            user = User.query.filter(User.username == username).first()
            if user:
                session['user'] = username
                session.permanent = True
                return redirect(url_for('jianshu'))
            else:
                return 'error username or password'
    
    
    @app.route("/enroll/", methods=['GET', 'POST'])
    def enroll():
        if request.method == 'GET':
            return render_template('enroll.html')
        else:
            username = request.form.get('username')
            password = request.form.get('password')
            user = User.query.filter(User.username == username).first()
            if user:
                return 'username exited'
            else:
                user = User(username=username, password=password)
                db.session.add(user)
                db.session.commit()
                return redirect(url_for('login'))
    
    @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('jianshu'))
    
    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("/post/",methods=['GET','POST'])
    @loginFirst
    def post():
        if request.method=='GET':
            return render_template('post.html')
        else:
            title=request.form.get('title')
            detail=request.form.get('detail')
            author_id=User.query.filter(User.username==session.get('user')).first().id
            post=Post(title=title,detail=detail,author_id=author_id)
            db.session.add(post)
            db.session.commit()
            return redirect(url_for('jianshu'))
    
    
    
    if __name__ == '__main__':
        app.run(debug=True)

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  • 原文地址:https://www.cnblogs.com/lintingting/p/7909288.html
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