# 根据现有的表结构构建模型类
class Users(db.Model):
    __tablename__ = "users"
    id = db.Column(db.Integer,primary_key=True)
    username = db.Column(db.String(80),unique=True)
    age = db.Column(db.Integer)
    email = db.Column(db.String(120),unique=True)

    def __init__(self,username,age,email):
        self.username = username
        self.age = age
        self.emai