从我的 sql 检索数据并使用 python 将其发送到 Web 服务

Question

我正在尝试从 Raspberry Pi 2 中的 MySQL 检索数据并使用 python 将该数据发布到 Web 服务。我可以使用 python 脚本从 raspberry pi 中的 MySQL 检索数据。但是，当我尝试将数据值传递给它时，我无法使用单独的 python 脚本将数据发布到 Web 服务。谁能告诉我我做错了什么？还是有其他方法可以做到这一点？

Python 从 MySQL 中检索数据的代码 Raspberry Pi(fetchdata.py):

import MySQLdb
import sys
import subprocess

db = MySQLdb.connect("localhost", "root", "1234", "tempdata")
cursor = db.cursor()
sql = "SELECT * FROM webdata"

cursor.execute(sql)
results = cursor.fetchall()
for row in results:
    ID = row[0]
    ChannelID = row[1]
    TimeStamp = row[2]
    RMSVoltage = row[3]

print "ID=%s, ChannelID=%s, TimeStamp=%s, RMSVoltage=%s" % (ID, ChannelID, TimeStamp, RMSVoltage)

db.close()

我得到的输出如下：

ID=4, ChannelID=43, TimeStamp=56, RMSVoltage=78

这是我的 python 用于发布到网络服务的代码 (sendjson.py):

import sys
import json
import pprint
import requests
import subprocess
import fetchdata #name of python script that retrieves data from MySQL in RPi

url = 'http://192.168.1.101/TestWebsite/api/SecondlyReadingDatas'
query = {'ID': 'fetchdata.ID, 'ChannelID': fetchdata.ChannelID, 'TimeStamp': fetchdata.TimeStamp', 'RMSVoltage': 'fetchdata.RMSVoltage'}

headers = {'Content-Type': 'application/json'}
r = requests.post(url, headers=headers, data=json.dumps(query))
print(r.text)

这是我得到的输出：

ID=4, ChannelID=43,TimeStamp=56, RMSVoltage=78

{"Message":The request is invalid.","ModelState":{"secondlyReading.ID"["An error has occured."]", secondlyReading.ChannelID"["An error has occured."], "secondlyReading.TimeStamp"["An error has occured."], "secondlyReading.RMSVoltage"["An error has occured."]}}

谁能告诉我我做错了什么？我没有在我的网络服务上获得任何新数据。

Answer 1

Question: So I need to add the missing '?

否，删除不添加！
你的 dict 应该是这样的，我删除了 4 '!

query = {'ID': fetchdata.ID, 'ChannelID': fetchdata.ChannelID, 'TimeStamp': fetchdata.TimeStamp, 'RMSVoltage': fetchdata.RMSVoltage}

How to use dictionaries in Python
About dictionaries in Python Use {} curly brackets to construct the dictionary, and [] square brackets to index it.
Separate the key and value with colons : and with commas , between each pair.
Keys must be quoted

从我的 sql 检索数据并使用 python 将其发送到 Web 服务

Retrieving data from my sql and sending it to a web service using python

python

mysql

web-services

raspberry-pi2