当我运行大型查询(查询返回多行)时,我得到了 Lost connection to MySQL server during query
错误,我看不出我做错了什么。我使用mysql.com的“新”mysql驱动程序(不是“旧的”MySQLdb),以及与MAMP捆绑在一起的mysql版本。 Python 2.7。表没有损坏, analyze table nrk2013b_tbl;
返回状态确定。这是一个打破的例子:
#!/usr/bin/python2.7
# coding: utf-8
import sys
import mysql.connector # version 2.0.1
connection = mysql.connector.connect(
unix_socket="/Applications/MAMP/tmp/mysql/mysql.sock",
user="dbUsernam",
passwd="dbUserPassword",
db="nrk",
charset = "utf8",
use_unicode = True)
cur = connection.cursor()
cur.execute("USE nrk;")
sql = """SELECT id FROM nrk2013b_tbl WHERE main_news_category = 'Sport'"""
cur.execute(sql)
rows = cur.fetchall()
print rows
sys.exit(0)
这导致我大部分时间都会遇到错误:
Traceback (most recent call last):
File "train_trainer_test.py", line 20, in <module>
remaining_rows = cur.fetchall()
File "/Library/Python/2.7/site-packages/mysql/connector/cursor.py", line 823, in fetchall
(rows, eof) = self._connection.get_rows()
File "/Library/Python/2.7/site-packages/mysql/connector/connection.py", line 669, in get_rows
rows = self._protocol.read_text_result(self._socket, count)
File "/Library/Python/2.7/site-packages/mysql/connector/protocol.py", line 309, in read_text_result
packet = sock.recv()
File "/Library/Python/2.7/site-packages/mysql/connector/network.py", line 226, in recv_plain
raise errors.InterfaceError(errno=2013)
mysql.connector.errors.InterfaceError: 2013: Lost connection to MySQL server during query
第20行是 rows = cur.fetchall()
如果我将查询限制为结果较少 SELECT id FROM nrk2013b_tbl WHERE main_news_category = 'Sport' LIMIT 10
一切都很好。但我确实希望使用更大的结果集。对于一些特殊的问题解决方案,我已经移动了限制并将我想要的数据分解为较小的批次,但这仍然是一个问题。
为了考虑connect-timeout和max_allowed_packet等,我有这个my.cnf文件: File: /Applications/MAMP/conf/my.cnf
[mysqld]
max_allowed_packet = 64M
wait_timeout = 28800
interactive_timeout = 28800
connect-timeout=31536000
这似乎没有任何区别(我甚至不确定mysql是否识别这些设置)。当我从终端或Sequel Pro运行查询时,它工作正常。它只是通过python mysql.connector我得到这些错误。
有任何想法吗?
PS:我暂时放弃了,改为PyMySQL而不是Oracle mysql.connector。通过改变这一点,问题似乎消失了(我自己总结出问题是在oracle mysql连接器中)。
import pymysql
conn = pymysql.connect(
unix_socket="/Applications/MAMP/tmp/mysql/mysql.sock",
user="dbUsernam",
passwd="dbUserPassword",
db="nrk",
charset = "utf8",
use_unicode = True)
conn.autocommit(True) # this I
cur = conn.cursor()