Json复制到数据库，而不覆盖数据库sqlalchemy中的先前数据

pip install sqlalchemy

import json
from sqlalchemy import create_engine, MetaData, Table, Column, JSON
from sqlalchemy.orm import sessionmaker

engine = create_engine('数据库连接字符串')
Session = sessionmaker(bind=engine)
session = Session()

metadata = MetaData()
my_table = Table('表名', metadata,
                 Column('id', Integer, primary_key=True),
                 Column('data', JSON)
                 )

json_data = {
    'key1': 'value1',
    'key2': 'value2',
    ...
}

insert_statement = my_table.insert().values(data=json.dumps(json_data))
session.execute(insert_statement)
session.commit()

select_statement = my_table.select()
result_set = session.execute(select_statement)
for row in result_set:
    print(row)