mariadbdb的Python插入循环不工作

Question

我尝试插入数据，但在命令更新之后，循环就完成了。 所以我删除了我的更新查询循环继续，我不明白为什么？你知道吗

#!/usr/bin/python
import mysql.connector as mariadb
from subprocess import Popen, PIPE, STDOUT
import re
import os

mariadb_connection = mariadb.connect(user='root', password='xxxx', database='xxxx');
cursor = mariadb_connection.cursor(buffered=True)
#retrieving information

cursor.execute("SELECT Domain,Id FROM classement where Domain like '%com';")

for Domain,Id in cursor:
          counter=0
          for character in Domain:
                if (character == "."):
                        counter = counter + 1
                        if (counter==1):
                            print(Domain)
                            pingresult = Popen(['ping','-c','3', Domain], stdout=PIPE, stderr=STDOUT).communicate()[0]
                            pingresult=str(pingresult)
                            ping = pingresult.find('min/avg/max/mdev')
                            ping=pingresult[ping+19:-6]
                            print(ping)
                            cursor.execute('update classement set Ping = "%s" where Domain = "%s";' % (ping,Domain))
                            mariadb_connection.commit()
mariadb_connection.close()