Flask项目里面，如何同时使用MySQL和MongoDB，Sqlalchemy和MongoEngine？
from mongoengine import *
import datetime
class Page(Document):
title = StringField(max_length=200, required=True)
date_modified = ateTimeField(default=datetime.datetime.now)
author = xxxx????【这里怎么关联到User呢？？ 手工？】
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from sqlalchemy import Column, Integer, String
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
name = Column(String)
fullname = Column(String)
password = Column(String)
