如何处理“finally”块中的异常？

uubf1zoe 于 2021-06-26 发布在 Impala

关注(0)|答案(1)|浏览(231)

给定以下python代码：


# Use impyla package to access Impala

from impala.dbapi import connect
import logging

def process():
    conn = connect(host=host, port=port)  # Mocking host and port
    try:
        cursor = conn.cursor()
        # Execute query and fetch result
    except:
        loggin.error("Task failed with some exception")
    finally:
        cursor.close()  # Exception here!
        conn.close()

与 Impala 的连接已创建。但在这方面有一个例外 cursor.close() 由于 Impala 超时。
什么是正确的方法来关闭 cursor 以及 conn 考虑到潜在的例外？

impala python impyla

来源：https://stackoverflow.com/questions/37383466/how-to-handle-exception-in-the-finally-block

1条答案

按热度按时间

ggazkfy81#

必须嵌套try块：

def process():
    conn = connect(host=host, port=port)  # Mocking host and port
    try:
        cursor = conn.cursor()
        try:
            # Execute query and fetch result
        finally:
            # here cursor may fail
            cursor.close()
    except:
        loggin.error("Task failed with some exception")
    finally:
        conn.close()

为了避免这种try finally块，可以使用 with -声明：

def process():
    conn = connect(host=host, port=port)  # Mocking host and port
    try:
        with conn.cursor() as cursor:
            # Execute query and fetch result
            # cursor is automatically closed
    except:
        loggin.error("Task failed with some exception")
    finally:
        conn.close()

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如何处理“finally”块中的异常？

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