我有一个数据库连接方法,它创建连接并将游标设置为init进程的一部分。
然后我有以下使用光标的方法:
def calculatePercentile(self):
user_edits = ur'''SELECT /* SLOW_OK_LIMIT: 1800 */ user_id, user_editcount from user'''
num_user_per_percentile = ur'''SELECT /* SLOW_OK_LIMIT: 1800 */ count(user_id) from user where user_editcount = %(count)s'''
lang_edit_count_dictionary = {}
lang_edit_count_dictionary[self.language] = []
edit_count_list = []
p = [10, 20, 30, 40, 50, 60, 70, 80, 90, 95]
bot_users = self._getBotUsers()
success = False
attempts = 0
while attempts < 3 and not success:
try:
self.dbCursor.execute(user_edits)
for user in self.dbCursor.fetchall():
user_id = user['user_id']
user_editcount = user['user_editcount']
if user_id not in bot_users:
edit_count_list.append(user_editcount)
edit_count_list.sort()
for i in p:
lang_edit_count_dictionary[self.language].append(np.percentile(edit_count_list, i))
success = True
except MySQLdb.OperationalError, sqlEx:
attempts += 1
if sqlEx[0] == 2006:
logging.info("Caught the MySQL server gone away exception")
logging.error(sqlEx)
time.sleep(10)
self.connectServer()
except Exception, e:
traceback.print_exc()
logging.exception(e)
for key, values in lang_edit_count_dictionary.iteritems():
print key
for value in values:
self.dbCursor.execute(num_user_per_percentile, {"count":value})
uEditCount = self.dbCursor.fetchone()
print uEditCount
此方法的作用是,它执行一个查询获取其数据并将该数据转储到其中,然后使用相同的游标在其中执行另一个查询:
for key, values in lang_edit_count_dictionary.iteritems():
print key
for value in values:
self.dbCursor.execute(num_user_per_percentile, {"count":value})
uEditCount = self.dbCursor.fetchone()
print uEditCount
发生的事情是我收到以下错误:
self.dbCursor.execute(num_user_per_percentile, {"count":value})
File "/home/auduwage/code/vInterLang/local/lib/python2.7/site-packages/MySQLdb/cursors.py", line 201, in execute
self.errorhandler(self, exc, value)
File "/home/auduwage/code/vInterLang/local/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
_mysql_exceptions.ProgrammingError: (2014, "Commands out of sync; you can't run this command now")
Exception _mysql_exceptions.ProgrammingError: (2014, "Commands out of sync; you can't run this command now") in <bound method SSDictCursor.__del__ of <MySQLdb.cursors.SSDictCursor object at 0x2716ed0>> ignored
在此之前,我在不同的方法中使用了相同的游标,我认为这与 MySql 不允许我使用相同的游标一个接一个地运行多个查询无关?或者是吗?解决方案是什么?