python3 mysql has gone away 解决办法

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报错信息

_mysql_exceptions.OperationalError: (2006, 'MySQL server has gone away')
_mysql_exceptions.OperationalError: (2013, 'Lost connection to MySQL server during query')

脚本可能需要跑几天才可以将数据收集完全，这样的情况出现是会非常多

解决办法

# -*- coding: utf-8 -*
import os, re
import MySQLdb

conn = cursor = None
dbname = 'test'
retry = 0


def cursor_execute(sql, param=()):
    global retry
    try:
        return cursor.execute(sql, param)
    except (AttributeError, MySQLdb.OperationalError) as e:
        retry += 1
        if retry > 7:
            raise e
        else:
            print('Try Connect %s ' % retry)
            re_connect()
            return cursor_execute(sql, param)

def re_connect():
    global conn, cursor
    DB_CONNECT = {
        'user': 'root',
        'passwd': '123456',
        'host': '127.0.0.1',
        'charset': 'utf8',
        'port': 3306,
        'use_unicode': True,
    }
    conn = MySQLdb.connect(**DB_CONNECT)
    conn.autocommit(True)
    cursor = conn.cursor(cursorclass=MySQLdb.cursors.DictCursor)
    if not cursor_execute("SHOW DATABASES LIKE '%s' " % (dbname,)):
        cursor_execute("CREATE DATABASE IF NOT EXISTS " + dbname)

    cursor_execute("USE " + dbname)

测试

def now():
    cursor_execute("select now() as now")
    return cursor.fetchone()['now']
    
while True:
    print(now())
    time.sleep(5)

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