模型分离（选做）

from werkzeug.security import generate_password_hash,check_password_hash
from datetime import datetimeclass 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))

    @property
    def password(self):  # 外部使用，取值
        return self._password

    @password.setter
    def password(self, row_password):  # 外部使用，赋值
        self._password = generate_password_hash(row_password)

    def check_password(self, row_password):  # 密码验证
        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__ = ‘comment‘
    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‘))
    creat_time = db.Column(db.DateTime, default=datetime.now)
    detail = db.Column(db.Text, nullable=False)
    question = db.relationship(‘Question‘, backref=db.backref(‘comments‘))
    author = db.relationship(‘User‘, backref=db.backref(‘comments‘))

from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()

from exts import db

from model import Question,User,Comment

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