我正在从Chris Reeves的一系列教程中学习网络抓取技术。非常好的东西,你应该看看。
我遇到了来自tutorial no. 10的示例问题,其中Chris解释了与mySQL数据库的连接。首先我遇到的问题是没有将值提交到数据库中的表。然后在评论中我发现我遗漏了conn.commit()
视频作者未包含在他的程序中。我已经将这部分代码添加到我的程序中,这很有效,现在它看起来像这样:
from threading import Thread
import urllib
import re
import MySQLdb
conn = MySQLdb.connect(host="127.0.0.1",port=3307,user="root",passwd="root",db="stock_data")
query = "INSERT INTO tutorial (symbol) values('AAPL')"
x = conn.cursor()
x.execute(query)
conn.commit()
row = x.fetchall()
它连接到我的本地数据库,并成功地将 AAPL 添加到符号列下的表教程。
我的问题始于Chris教程的第二部分,您可以在其中添加多线程部分代码,该代码从外部.txt文件中读取4字母符号,并将所有内容添加到同一数据库中。
现在我的程序看起来像这样:
from threading import Thread
import urllib
import re
import MySQLdb
gmap = {}
def th(ur):
base = "http://finance.yahoo.com/q?s="+ur
regex = '<span id="yfs_l84_'+ur.lower()+'">(.+?)</span>'
pattern = re.compile(regex)
htmltext = urllib.urlopen(base).read()
results = re.findall(pattern,htmltext)
try:
gmap[ur] = results [0]
except:
print "got an error"
symbolslist = open("threads/symbols.txt").read()
symbolslist = symbolslist.replace(" ","").split(",")
print symbolslist
threadlist = []
for u in symbolslist:
t = Thread(target=th,args=(u,))
t.start()
threadlist.append(t)
for b in threadlist:
b.join()
conn = MySQLdb.connect(host="127.0.0.1",port=3307,user="root",passwd="root",db="stock_data")
for key in gmap.keys():
print key,gmap[key]
query = "INSERT INTO tutorial (symbol,last) values("
query = query+"'"+key+"',"+gmap[key]+")"
x = conn.cursor()
x.execute(query)
conn.commit()
row = x.fetchall()
几乎与Chris example完全一样(除了我不使用外部登录数据,但直接在代码中,但这不是问题),我收到所有线程的错误,它们看起来像这样:
Exception in thread Thread-474:
Traceback (most recent call last):
File "C:\Python27\lib\threading.py", line 810, in __bootstrap_inner
self.run()
File "C:\Python27\lib\threading.py", line 763, in run
self.__target(*self.__args, **self.__kwargs)
File "threads/threads2.py", line 12, in th
htmltext = urllib.urlopen(base).read()
File "C:\Python27\lib\urllib.py", line 87, in urlopen
return opener.open(url)
File "C:\Python27\lib\urllib.py", line 208, in open
return getattr(self, name)(url)
File "C:\Python27\lib\urllib.py", line 345, in open_http
h.endheaders(data)
File "C:\Python27\lib\httplib.py", line 969, in endheaders
self._send_output(message_body)
File "C:\Python27\lib\httplib.py", line 829, in _send_output
self.send(msg)
File "C:\Python27\lib\httplib.py", line 791, in send
self.connect()
File "C:\Python27\lib\httplib.py", line 772, in connect
self.timeout, self.source_address)
File "C:\Python27\lib\socket.py", line 571, in create_connection
raise err
IOError: [Errno socket error] [Errno 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
正如我所说,对于Thread-474,这只是一个错误,但我在IDE中为多个线程获取它,对于Thread-441,Thread-390,Thread-391等......
我错过了什么?它是在代码或我的MySql服务器设置中的东西?因为根据Chris示例中的所有内容,它应该可以正常工作
帮助任何人?
答案 0 :(得分:0)
您的主题正在尝试访问网站,并且与数据库无关;因此,您的问题不在于您的数据库的设置(并且您已经尝试并确认它可以正常工作),但是您的互联网连接。
您确定您拥有网络连接并设置了正确的代理等吗?
答案 1 :(得分:0)
似乎我遇到套接字超时问题....
我添加了
timeout = 10
socket.setdefaulttimeout(timeout)
在定义之前它按预期工作! :)