Python Scrapy 在每个 process_item 上维护 SSH MySQL 连接

Question

我对 Scrapy 和 Python 还很陌生。

我能够使用 SSH 凭据连接到我的远程数据库对，但是...

希望防止在每个被抓取的项目上发生此错误。

Error: 2055: Lost connection to MySQL server at '127.0.0.1:3306', system error: 10053 An established connection was aborted by the software in your host machine

下面是我的 MySQL 管道对象

import mysql.connector
import sshtunnel

class MySQLStorePipeline(object):

def __init__(self):
    with sshtunnel.SSHTunnelForwarder(
        ('13.***.***.***', 22),
        ssh_username='***',
        ssh_password='***',
        remote_bind_address=('db1.prod.***.***.net.***', 3306),
        local_bind_address=('127.0.0.1', 3306)
    ) as tunnel:

        self.dbcon = mysql.connector.connect(
            host='127.0.0.1', 
            port=3306,
            user='***', 
            database='***', 
            password='***',
            charset='utf8'
        )
        self.cursor = self.dbcon.cursor() 

def process_item(self, item, spider):
    try:
        tables = self.cursor.execute('SHOW TABLES')
        print tables.fetchall()

        self.dbcon.commit()            
    except mysql.connector.Error as err:
        print('Error: {}'.format(err))

    return item

我只是不知道如何在process_item函数内维护数据库连接

Answer 1

您正在使用 with ... 这就是您出现此行为的原因 SSH tunnel from Python is closing automatically