Question

如果之前已经提出过这个问题我很抱歉，但是我无法找到这个问题的任何记录。完全披露：我只用了几个月的Python和MySQL大约一个月。

我在Raspberry Pi（运行Raspbian Wheezy）上编写了一个简短的Python脚本，它会嗅探wifi数据包并将信号强度信息写入MySQL数据库。我还创建了一个小的PHP文件，它从数据库中获取信息并将其显示在表格中（非常基本）。这个小系统的所有组件都按照计划完成，但是......

当我在后台运行Python脚本（sudo python my_script.py＆amp;）时，似乎没有用新读数更新MySQL数据库。然而它也没有出现任何错误和输出到控制台没有问题（每次拦截wifi数据包并将其RSSI添加到数据库时，我都会打印一行）。我在使用/etc/rc.local文件启动时启动脚本时遇到了同样的问题。没有错误，但数据库中也没有更新。

Python方面的问题是什么？我需要更改的MySQL设置？还有别的东西我完全不见了吗？

编辑添加代码：

#!/usr/bin/python
# -*- coding: utf-8 -*-

import MySQLdb as mdb
import sys
from scapy.all import *

# Create connection to MySQL database called 'DATABASE' at localhost with username 'USERNAME' and password 'PASSWORD'
HOST = "localhost"
USER = "USERNAME"
PW = "PASSWORD"
DB = "DATABASE"

con = mdb.connect(HOST, USER, PW, DB)

# set interface that will be used to monitor wifi
interface = "mon0"

with con:

        cur = con.cursor()

        # This function will be called every time a packet is intercepted. Packet is passed to function as 'p'
        def sniffmgmt(p):

                # These are the 3 types of management frames that are sent exclusively by clients (allows us to weed out packets sent by APs)
                stamgmtstypes = (0, 2, 4)

                if p.haslayer(Dot11):

                        # Make sure packet is a client-only type
                        if p.subtype in stamgmtstypes:

                                # Calculate RSSI
                                sig_str = -(256-(ord(p.notdecoded[-4:-3])))

                                # Update database with most recent detection
                                cur.execute("REPLACE INTO attendance(mac_address, rssi, timestamp) VALUES('%s', %d, NOW())" % (p.addr2, sig_str))

                                # Print MAC address that was detected (debugging only)
                                print "MAC Address (%s) has been logged" % (p.addr2)

        # Tell scapy what interface to use (see above) and which function to call when a packet is intercepted. lfilter limits packets to management frames.
        sniff(iface=interface, prn=sniffmgmt, store=0, lfilter=lambda x:x.type==0)

谢谢！凯尔

P.S。对于那些想知道的人：这不是用于恶意使用，它被用于调查我们仓库的产品跟踪技术。

Answer 1

我希望你不要在db事务上调用commit。

Python后台进程没有写入MySQL db

1 个答案: