問題描述

在寫爬蟲中,我要把爬取到的數據存到數據庫中.每一個頁面里邊有很多條目,比如一個人的訪客可能有很多個,于是插入卸載循環中,

try: sql_visitor=’INSERT INTO visitor (ownername,owneruid,visitorname,visitoruid,visittime) VALUE ('%s',%d,'%s',%d,'%s')’%(ownername,owneruid,visitorname,visitoruid,visitortime) print sql_visitor self.cursor.execute(sql_visitor) self.connect.commit()except Exception as e: print e

一個頁面一個線程,嫌棄慢的我開了5個

max_threads=5while uid < 8000000 or threadlist: for thread1 in threadlist:if not thread1.is_alive(): threadlist.remove(thread1) while len(threadlist) < max_threads and uid < 8000000:uid+=1thread2=threading.Thread(target=run,args=(uid,))thread2.setDaemon(True)thread2.start()threadlist.append(thread2) time.sleep(5)

運行很順利:

INSERT INTO visitor (ownername,owneruid,visitorname,visitoruid,visittime) VALUE ('huosai7',4893,'Liang2017',7252799,'2017-5-22 21:06')INSERT INTO personalinfo (ownername,owneruid,jifen,huajiao,xiaomijiao,jinbi,haoyou,zhuti,rizhi,xiangce,fenxiang,kongjianfangwenliang,youxiangyanzheng,shipinrenzheng,juzhudi,chushengdi,shangcifabiaoshijian,shangcihuodongshijian,zuihoufangwen,zhuceshijian,zaixianshijian,shengri,xingbie) VALUE('huosai7',4893,0,0,0,0,0,0,0,0,0,0,0,0,'','','2100-01-01 12:00','2100-01-01 12:00','2100-01-01 12:00','2004-1-3 19:28',0,'2100-01-01 12:00',0)INSERT INTO visitor (ownername,owneruid,visitorname,visitoruid,visittime) VALUE ('龍樂',4894,'Liang2017',7252799,'2017-5-22 21:06')(1062, 'Duplicate entry ’4894-7252799-2017-05-22 21:06:00’ for key ’PRIMARY’')INSERT INTO personalinfo (ownername,owneruid,jifen,huajiao,xiaomijiao,jinbi,haoyou,zhuti,rizhi,xiangce,fenxiang,kongjianfangwenliang,youxiangyanzheng,shipinrenzheng,juzhudi,chushengdi,shangcifabiaoshijian,shangcihuodongshijian,zuihoufangwen,zhuceshijian,zaixianshijian,shengri,xingbie) VALUE('龍樂',4894,0,0,0,0,0,0,0,0,0,0,0,0,'','','2100-01-01 12:00','2100-01-01 12:00','2100-01-01 12:00','2004-1-3 20:21',0,'2100-01-01 12:00',0).......

于是我將max_thread設置成10,于是結果如下:

INSERT INTO visitor (ownername,owneruid,visitorname,visitoruid,visittime) VALUE ('xiao61',4889,'Liang2017',7252799,'2017-5-22 21:06')

(2006, ’MySQL server has gone away’)

INSERT INTO personalinfo (ownername,owneruid,jifen,huajiao,xiaomijiao,jinbi,haoyou,zhuti,rizhi,xiangce,fenxiang,kongjianfangwenliang,youxiangyanzheng,shipinrenzheng,juzhudi,chushengdi,shangcifabiaoshijian,shangcihuodongshijian,zuihoufangwen,zhuceshijian,zaixianshijian,shengri,xingbie) VALUE('xiao61',4889,0,0,0,0,0,0,0,0,0,0,0,0,'','','2100-01-01 12:00','2100-01-01 12:00','2100-01-01 12:00','2004-1-3 15:56',0,'2100-01-01 12:00',0)

(2006, ’MySQL server has gone away’)

INSERT INTO visitor (ownername,owneruid,visitorname,visitoruid,visittime) VALUE ('糊涂酷酷熊',4897,'Liang2017',7252799,'2017-5-22 21:06')

(2006, ’MySQL server has gone away’)

INSERT INTO personalinfo (ownername,owneruid,jifen,huajiao,xiaomijiao,jinbi,haoyou,zhuti,rizhi,xiangce,fenxiang,kongjianfangwenliang,youxiangyanzheng,shipinrenzheng,juzhudi,chushengdi,shangcifabiaoshijian,shangcihuodongshijian,zuihoufangwen,zhuceshijian,zaixianshijian,shengri,xingbie) VALUE('糊涂酷酷熊',4897,611,0,1655,0,0,2,0,0,0,34,0,0,'','','2007-3-27 00:37','2007-3-27 00:37','2007-3-27 00:37','2004-1-3 21:08',0,'2100-01-01 12:00',1)

(2006, ’MySQL server has gone away’).......

可以看出2006出來了,然后我將max_thread設置成30,然后結果如下:

就將,夠詳細嗎?不夠詳細還需要什么只管說!

問題解答

看這里，我猜你是用的是pymysql，它的線程安全描述為1，對應的pep249里面做了詳細的描述:

Threads may share the module, but not connections.

線程可以共享模塊但不能共享連接。這也就是說你可能得在每個線程中創建一個連接。

吶～為什么不用orm來做呢？