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我有一個桶文件夾，其中包含形式爲yy-mm-dd.CSV的csv文件，其中包含幾行標題，我可以忽略第二行末尾的日期，然後是151行timestamp：power（千瓦）。這裏有一個片段：Python，MySQL迴歸，SQL錯誤或錯誤的條件？
sep=;
Version CSV|Tool SunnyBeam11|Linebreaks CR/LF|Delimiter semicolon|Decimalpoint point|Precision 3|Language en-UK|TZO=0|DST|2012.06.21
;SN: removed
;SB removed
;2120138796
Time;Power
HH:mm;kW
00:10;0.000
00:20;0.000
00:30;0.000
00:40;0.000
00:50;0.000
01:00;0.000
01:10;0.000
01:20;0.000
01:30;0.000
01:40;0.000
01:50;0.000
02:00;0.000
02:10;0.000
02:20;0.000
02:30;0.000
02:40;0.000
02:50;0.000
03:00;0.000
03:10;0.000
03:20;0.000
03:30;0.000
03:40;0.000
03:50;0.000
04:00;0.000
04:10;0.000
04:20;0.000
04:30;0.000
04:40;0.000
04:50;0.006
05:00;0.024
05:10;0.006
05:20;0.000
05:30;0.030
05:40;0.036
05:50;0.042
06:00;0.042
06:10;0.042
06:20;0.048
06:30;0.060
06:40;0.114
06:50;0.132
07:00;0.150
我解析這些文件的檢查，他們有這種格式的文件名，因爲有其他的文件，我不想分析桶文件夾，和我搶日期從每兩排文件並存儲它。我連接到數據庫，然後處理剩下的行，將存儲的日期與第9行（或其附近）後面的每行上的時間戳連接起來。我也抓住每條線上的第二個值（功率，單位爲千瓦）。目的是將連接的日期時間值和關聯的功率值插入連接的mysql數據庫中。讀取最後一行時，文件將被移至名爲'parsed'的子文件夾。所有這些都按預期進行，但每行讀取都會經過「不能附加到Db」的try/except循環（第107行）的除外分支。我已經通過登錄到MySQL（實際上是MariaDB on OpenSuse LEAP 4.2）來檢查存儲的數據庫credentails的工作情況，並且該工作和我已經打印了連接變量，這兩個都導致我相信我實際上已經正確連接每個文件。我會剪掉了我的Python腳本的部分，使其短，但我不是一個particuarly高級Python編碼器和我不想冒險缺少關鍵部分：
#!/usr/bin/python
from os import listdir
from datetime import datetime
import MySQLdb
import shutil
import syslog
#from sys import argv
def is_dated_csv(filename):
"""
Return True if filename matches format YY-MM-DD.csv, otherwise False.
"""
date_format = '%y-%m-%d.csv'
try:
date = datetime.strptime(filename, date_format)
return True
except ValueError:
# filename did not match pattern
syslog.syslog('SunnyData file ' + filename + ' did NOT match')
#print filename + ' did NOT match'
pass
#'return' terminates a function
return False
def parse_for_date(filename):
"""
Read file for the date - from line 2 field 10
"""
currentFile = open(filename,'r')
l1 = currentFile.readline() #ignore first line read
date_line = currentFile.readline() #read second line
dateLineArray = date_line.split("|")
day_in_question = dateLineArray[-1]#save the last element (date)
currentFile.close()
return day_in_question
def normalise_date_to_UTF(day_in_question):
"""
Rather wierdly, some days use YYYY.MM.DD format & others use DD/MM/YYYY
This function normalises either to UTC with a blank time (midnight)
"""
if '.' in day_in_question: #it's YYYY.MM.DD
dateArray = day_in_question.split(".")
dt = (dateArray[0] +dateArray[1] + dateArray[2].rstrip() + '000000')
elif '/' in day_in_question: #it's DD/MM/YYYY
dateArray = day_in_question.split("/")
dt = (dateArray[2].rstrip() + dateArray[1] + dateArray[0] + '000000')
theDate = datetime.strptime(dt,'%Y%m%d%H%M%S')
return theDate #A datetime object
def parse_power_values(filename, theDate):
currentFile = open(filename,'r')
for i, line in enumerate(currentFile):
if i <= 7:
doingSomething = True
print 'header' + str(i) + '/ ' + line.rstrip()
elif ((i > 7) and (i <= 151)):
lineParts = line.split(';')
theTime = lineParts[0].split(':')
theHour = theTime[0]
theMin = theTime[1]
timestamp = theDate.replace(hour=int(theHour),minute=int(theMin))
power = lineParts[1].rstrip()
if power == '-.---':
power = 0.000
if (float(power) > 0):
print str(i) + '/ ' + str(timestamp) + ' power = ' + power + 'kWh'
append_to_database(timestamp,power)
else:
print str(i) + '/ '
elif i > 151:
print str(timestamp) + ' DONE!'
print '----------------------'
break
currentFile.close()
def append_to_database(timestampval,powerval):
host="localhost", # host
user="removed", # username
#passwd="******"
passwd="removed"
database_name = 'SunnyData'
table_name = 'DTP'
timestamp_column = 'DT'
power_column = 'PWR'
#sqlInsert = ("INSERT INTO %s (%s,%s) VALUES('%s','%s')" % (table_name, timestamp_column, power_column, timestampval.strftime('%Y-%m-%d %H:%M:%S'), powerval))
#sqlCheck = ("SELECT TOP 1 %s.%s FROM %s WHERE %s.%s = %s;" % (table_name, timestamp_column, table_name, table_name, timestamp_column, timestampval.strftime('%Y-%m-%d %H:%M:%S')))
sqlInsert = ("INSERT INTO %s (%s,%s) VALUES('%s','%s')", (table_name, timestamp_column, power_column, timestampval.strftime('%Y-%m-%d %H:%M:%S'), powerval))
sqlCheck = ("SELECT TOP 1 %s.%s FROM %s WHERE %s.%s = %s;", (table_name, timestamp_column, table_name, table_name, timestamp_column, timestampval.strftime('%Y-%m-%d %H:%M:%S')))
cur = SD.cursor()
try:
#cur.execute(sqlCheck)
# Aim here is to see if the datetime for the file has an existing entry in the database_name
#If it does, do nothing, otherwise add the values to the datbase
cur.execute(sqlCheck)
if cur.fetchone() == "None":
cur.execute(sqlInsert)
print ""
SD.commit()
except:
print 'DB append failed!'
syslog.syslog('SunnyData DB append failed')
SD.rollback()
# Main start of program
path = '/home/greg/currentGenerated/SBEAM/'
destination = path + '/parsed'
syslog.syslog('parsing SunnyData CSVs started')
for filename in listdir(path):
print filename
if is_dated_csv(filename):
#connect and disconnect once per CSV file - wasteful to reconnect for every line in def append_to_database(...)
SD = MySQLdb.connect(host="localhost", user="root",passwd="removed", db = 'SunnyData')
print SD
print filename + ' matched'
day_in_question = parse_for_date(filename)
print 'the date is ' + day_in_question
theDate = normalise_date_to_UTF(day_in_question)
parse_power_values(filename, theDate)
SD.close()
shutil.move(path + '/' + filename, destination)
syslog.syslog('SunnyData file' + path + '/' + filename + 'parsed & moved to ' + destination)
它用於工作，但它一直很長一段時間，自從我上次檢查以來有很多更新。我擔心迴歸可能會改變我的代碼下的東西。只是不知道如何全力以赴。
道歉，這不是一個非常明確和具體的問題，但如果你能幫我分揀，它可能仍然是一個很好的例子，爲其他人？
感謝
格雷格
考慮捕獲異常：'除了'例外作爲e：print（e）'而不是'print'DB append失敗或者除了''print append failed！''，因爲你會得到實際的MySQL/Mariadb或Python錯誤消息。 – Parfait
我加了你的建議，現在有更好的見解。原來這是一個類型錯誤 '參數1必須是字符串或只讀緩衝區，而不是元組' 現在只需要閱讀如何處理它：o） – Greg