每隔一段时间（可能每隔几个小时），我的程序就会出现错误
'08S01', '[08S01] [Microsoft][ODBC SQL Server Driver]Communication link failure
我只是希望能够捕获此错误并重新连接。我怎么做一个听众？
这是我的代码......
#!C:/Python/python.exe -u
import pyodbc, requests, re, time, random, sys,pickle,smtplib,os
from datetime import datetime
from multiprocessing import Lock, Process, Queue, current_process
from azure.storage.blob import BlobService
auth = requests.auth.HTTPProxyAuth('user', 'pwd')
proxies = {'http': 'proxies'}
user_agent = {'user-agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36'}
blob_service = BlobService(account_name='user', account_key='pwd')
update = ("""UPDATE DocumentList
SET Downloaded=?, DownLoadedAs=?,DownLoadedWhen=?,DownLoadedSizeKB=?
WHERE DocNumberSequence=?""")
def Downloader(linkQueue,fileQueue,uniqueIDQueue):
for url in iter(linkQueue.get, 'STOP'):
name = current_process().name
link = url
fileName = fileQueue.get();
uniqueID=uniqueIDQueue.get();
cnxn2 = pyodbc.connect('DRIVER={SQL Server};SERVER=.windows.net;DATABASE=db;UID=userPWD=pwd', autocommit=True);
cursor2 = cnxn2.cursor()
#if 'LAS' or '.db' in str(fileName):
#continue
print 'BEFORE REQUEST'
try:
r = requests.get(link, proxies=proxies,headers=user_agent,auth=auth,allow_redirects=False)
except requests.exceptions.RequestException as e: # This is the correct syntax
print e
content = {}; content = r.headers
if 'location' in content:
link = content['location'];
if 'content-type' in content:
extType= content['content-type'];
ext = re.search(r'/(\w+)',extType).group(1);
if 'content-length' in content:
size = float(content['content-length'])*.001
if ext=='pdf':
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
elif ext=='html':
print 'YOU ARE GETTING REDIRECT PAGE!!!!!'
break
elif ext=='vnd':
ext = 'xlsx'
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
elif ext=='msword':
ext = 'doc'
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
else:
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
else:
if 'content-type' in content:
extType= content['content-type'];
ext = re.search(r'/(\w+)',extType).group(1);
if 'content-length' in content:
size = float(content['content-length'])*.001
if ext=='pdf':
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
elif ext=='html':
server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login("user", "pwd")
msg = "Get back to headquaters!"
server.sendmail("email", "email", msg)
server.quit()
print 'YOU ARE GETTING REDIRECT PAGE!!!!!'
continue
elif ext=='vnd':
ext = 'xlsx'
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
elif ext=='msword':
ext = 'doc'
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
else:
with open(fileName+'.'+ext, "wb") as datum:
datum.write(r.content)
datum.close()
print 'here'
dt = datetime.now()
meta=[];meta1=[];meta1=[fileName,ext,link,dt,size]
meta.append(meta1)
#num = random.uniform(0,)
#time.sleep(num)
while True:
try:
blob_service.put_block_blob_from_path(
'container',
fileName+'.'+ext,
fileName+'.'+ext
)
break
except:
print sys.exc_info()[1]
while True:
try:
updated = cursor2.execute(update,'Yes', fileName+'.'+ext, dt, size,uniqueID )
break
except:
print sys.exc_info()[1]
cnxn2.close()
print fileName+'.'+ext
print 'done'+(current_process().name)
output = open(fileName+'.pkl', 'wb')
pickle.dump(meta, output)
output.close()
try:
os.remove(fileName+'.'+ext)
except OSError:
pass
if __name__ == '__main__':
numFiles = int(sys.argv[2])
cnxn = pyodbc.connect('DRIVER={SQL Server};SERVER=windows.net;DATABASE=;UID=;PWD=', autocommit=True);
cursor1 = cnxn.cursor()
cursor1.execute("""SELECT DocumentLink,DownLoadedAs,API,DocNumberSequence,StateAbbr
FROM DocumentList
WHERE StateAbbr='CA' AND DocNumberSequence>'1253750'""")
rows = cursor1.fetchmany(numFiles)
linkQueue=Queue();fileQueue=Queue();uniqueIDQueue=Queue();processes =[];
for row in rows:
url = str(row.DocumentLink)
linkQueue.put(url)
uniqueID = str(row.DocNumberSequence)
uniqueIDQueue.put(uniqueID)
#tracking = str(row.API)
#docType = str(row.DocumentClass)
abbr = str(row.StateAbbr)
fileName = row.DownLoadedAs
fileName = fileName.split('.')[0]
fileName = abbr+'_'+fileName+'_'+uniqueID; fileName=fileName.replace(' ','');
fileQueue.put(fileName)
cnxn.close()
print "BEFORE WORKERS"
workers = int(sys.argv[1]);
for x in xrange(workers):
p = Process(target=Downloader, args=(linkQueue, fileQueue, uniqueIDQueue))
p.start()
processes.append(p)
linkQueue.put('STOP')
fileQueue.put('STOP')
for p in processes:
p.join()
我认为错误已被捕获，因为它一直在继续但我不会重新连接，直到我突破该过程。我之前从未处理过这样的错误。我是否必须将整个代码块放入try connect中，或者我可以添加一个监听器吗？
答案 0 :(得分：1)
看起来这个错误是由`sys.exc_info（）[0]'打印的：
while True:
try:
updated = cursor2.execute(update,'Yes', fileName+'.'+ext, dt, size,uniqueID )
break
except:
print sys.exc_info()[1]
这是一个猜测工作，但它是你在try / except块中包含的唯一.execute()。要进行验证，您可以删除try / except，然后执行您已有的.execute()语句。
如果是这种情况，您可以将try / except重新放回原位，并在except中尝试重新连接？这是一个解决方法，但是在你正在使用的机器和数据库服务器之间建立一个故障保护（一级）来防止网络闪烁。祝你好运！