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我有两个数据库,我正在使用SQLAlchemy使用Python,数据库共享表名,因此我在运行代码时收到错误消息.

错误消息是:

sqlalchemy.exc.InvalidRequestError: Table 'wo' is already defined for this MetaData instance.  Specify 'extend_existing=True' to redefine options and columns on an existing Table object.

简化的代码如下:

from sqlalchemy import create_engine, Column, Integer, String, DateTime, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship, backref
from mysql.connector.connection import MySQLConnection

Base = declarative_base()



def get_characterset_info(self):
    return self.get_charset()

MySQLConnection.get_characterset_info = MySQLConnection.get_charset


mysqlengine = create_engine('mysql+mysqlconnector://......../mp2', echo=True)
MYSQLSession = sessionmaker(bind=mysqlengine)     
mysqlsession= MYSQLSession()                      


MP2engine = create_engine('mssql+pyodbc://......../mp2', echo=True)
MP2Session = sessionmaker(bind=MP2engine)     
mp2session= MP2Session()                      


class MYSQLWo(Base):
    __tablename__= 'wo' …