模型分离（选做）

from flask import Flask,render_template,request,redirect,url_for,session
import config
from functools import wraps
from sqlalchemy import or_,and_
from database import Question,User,Comment
from decorate import db

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

db.init_app(app)
# db.create_all()

from flask_sqlalchemy import SQLAlchemy
db=SQLAlchemy()

from datetime import datetime
from werkzeug.security import generate_password_hash,check_password_hash
from decorate import db

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(200), nullable=False)
    nickname = db.Column(db.String(20), nullable=True)

    @property
    def password(self):
        return self._password

    @password.setter
    def password(self, row_password):
        self._password = generate_password_hash(row_password)

    def check_password(self, row_password):
        result = check_password_hash(self._password, row_password)
        return result

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‘))

class Comment(db.Model):
    __tablename__ = ‘commment‘
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    author_id = db.Column(db.Integer, db.ForeignKey(‘User.id‘))
    question_id=db.Column(db.Integer,db.ForeignKey(‘question.id‘))
    detail=db.Column(db.Text,nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    question=db.relationship(‘Question‘,backref=db.backref(‘comments‘))
    author=db.relationship(‘User‘,backref=db.backref(‘comments‘))