Python psycopg2-'；非类型'；对象没有属性'；回滚'；

我正在尝试使用pyspark代码中的psycopg2从postgresql表中删除记录。但是我犯了一个错误。不知道怎么了。提前谢谢

def delete_records(table,city_list,key):
    connection = None
    try: 
        connection = psycopg2.connect(host=host,
                                             database=db,
                                             user=user,
                                             password=password)
        cursor = connection.cursor()
        delete_query = "Delete from " +table+ " where "+key+" in "+ str(tuple(city_list))
        cursor.execute(delete_query)
        connection.commit()
        logger.debug("Record deleted successfully")
    except (Exception, psycopg2.DatabaseError) as error :
        logger.error("%s transction error Reverting all other operations of a transction ", error)
        connection.rollback()
    finally:
        if connection is not None:
            cursor.close()
            connection.close()
            logger.debug("PostgreSQL connection is closed")

delete_records(table_name,city_list,"id")

错误

---

请帮忙。提前感谢

在您尝试的第一行中可能出现错误，因此当您到达except时，连接仍然没有

def delete_records(table,city_list,key):
    connection = None
    try: 
        connection = psycopg2.connect(host=host,
                                             database=db,
                                             user=user,
                                             password=password)
        cursor = connection.cursor()
        delete_query = "Delete from " +table+ " where "+key+" in "+ str(tuple(city_list))
        cursor.execute(delete_query)
        connection.commit()
        logger.debug("Record deleted successfully")
    except (Exception, psycopg2.DatabaseError) as error :
        logger.error("%s transction error Reverting all other operations of a transction ", error)
        connection.rollback()
    finally:
        if connection is not None:
            cursor.close()
            connection.close()
            logger.debug("PostgreSQL connection is closed")

delete_records(table_name,city_list,"id")

正如您在评论中提到的，将

如果连接不是None:

添加到except块听起来是个好主意

您可能需要了解记录器对错误的看法，以便进行故障排除，因此您可能需要以下内容：

except (Exception, psycopg2.DatabaseError) as error :
        logger.error("%s transction error Reverting all other operations of a transction ", error)
        if connection is not None:
            connection.rollback()

---

你的连接没有。您已经在

finally

语句中选中了None，那么为什么不选中

except

语句呢？这意味着没有执行查询？它将要离开街区吗？所以，如果连接不是None，我应该加上：除了block之外，还有什么？