怎么在数据库里找到后台密码

from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import bcrypt

Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    username = Column(String)
    password_hash = Column(String)

    def set_password(self, password):
        self.password_hash = bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')

    def check_password(self, password):
        return bcrypt.checkpw(password.encode('utf-8'), self.password_hash.encode('utf-8'))

# 创建数据库连接
engine = create_engine('sqlite:///example.db')
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()

# 添加用户
user = User(username='admin')
user.set_password('password123')
session.add(user)
session.commit()

# 验证密码
user = session.query(User).filter_by(username='admin').first()
if user and user.check_password('password123'):
    print("Password is correct")
else:
    print("Password is incorrect")