原生sql

 https://stackoverflow.com/questions/17972020/how-to-execute-raw-sql-in-flask-sqlalchemy-app

 配置参数

def fetchall(sql, args=None):
    if args is None:
        dataObj = db.session.execute(sql)
    else:
        dataObj = db.session.execute(sql, args)
    data = [dict(zip(result.keys(), result)) for result in dataObj.fetchall()]

    return data


def fetchone(sql, args=None):
    if args is None:
        dataObj = db.session.execute(sql)
    else:
        dataObj = db.session.execute(sql, args)

    data = dataObj.fetchone()
    if data is None:
        return None
    data = dict(zip(dataObj.keys(), dataObj.fetchone()))
    return data