Question

我正在尝试在表中输入浮点数据。通过多次输入，我不会出错，但是表中没有任何输入。因此，尝试仅输入1列数据，我得到“浮动对象不可迭代。

这是在raspbian linux上。尝试了多件事。温度是来自Adafruit_DHT的浮动。可以打印出值，但似乎无法将它们输入数据库。

#!/usr/bin/python
import sys
import Adafruit_DHT

import subprocess
import re
import os
import time
import MySQLdb as mdb
import datetime

databaseUsername="root"
databasePassword="jt"
databaseName="WordpressDB" #do not change unless you named the Wordpress database with some other name

sensor=Adafruit_DHT.DHT22 #if not using DHT22, replace with Adafruit_DHT.DHT11 or Adafruit_DHT.AM2302
pinNum=23 #if not using pin number 4, change here

def saveToDatabase(temperature, humidity):

        con=mdb.connect("localhost", databaseUsername, databasePassword, databaseName)
        currentDate=datetime.datetime.now().date()

        now=datetime.datetime.now()
        print (now)

        cur=con.cursor()
        #sql = "INSERT INTO temperatures (temperature, humidity, now) VALUES (%s, %s, %s)", (temperature, humidity, now)
        #dataWritten = cur.execute("INSERT INTO Temperature (temperature, humidity, datetime) VALUES (%s, %s, %s)", (temperature, humidity, now))
        dataWritten = cur.execute("INSERT INTO Temperature (temperature) VALUES (%s)", (temperature) )

        print (dataWritten)
        result = cur.fetchall()

        cur.close()
        return "true"


def readInfo():

        humidity, temperature = Adafruit_DHT.read_retry(sensor, pinNum)#read_retry - retry getting temperatures for 15 times
        temperature = temperature * 9.0 / 5.0 + 32.0
        print(("Temperature: %.2f F" % temperature))
        print(("Humidity:    %.2f %%" % humidity))

        if humidity is not None and temperature is not None:
                return saveToDatabase(temperature,humidity) #success, save the readings
        else:
                print ('Failed to get reading. Try again!')
                sys.exit(1)



status=readInfo() #get the readings
print (status)

I get float object is not iterable.
the table has only a auto increment int id and the temperature (6,3).
I am sure there is a simple fix, but it eludes me.

Error:
Temperature: 75.92 F
Humidity:    25.80 %
2019-05-19 16:01:33.198100
Traceback (most recent call last):
  File "getInfo.py", line 54, in <module>
    status=readInfo() #get the readings
  File "getInfo.py", line 47, in readInfo
    return saveToDatabase(temperature,humidity) #success, save the readings
  File "getInfo.py", line 30, in saveToDatabase
    dataWritten = cur.execute("INSERT INTO Temperature (temperature) VALUES (%s)", (temperature) )     
  File "/usr/local/lib/python3.5/dist-packages/MySQLdb/cursors.py", line 199, in execute
    args = tuple(map(db.literal, args))
TypeError: 'float' object is not iterable

python3 mariaDB Float对象不可迭代

0 个答案: