緣起:

       公司很多的資料庫的連結都是本地連線或者指定ip地址可以訪問, 如果你沒有該ip許可權, 但是你可以登入該資料庫所在的伺服器, 這個時候就可以使用ssh連結上這個伺服器,以此為跳板進行資料庫的連結.同樣Navicat也是支援這種操作的.但是開發中也要這種處理方式就需要sshtunnel包的輔助

github: https://github.com/pahaz/sshtunnel

安裝:

pip install sshtunnel

使用:

import pymysql
import traceback
from loguru import logger
from
 
 sshtunnel import SSHTunnelForwarder

        with SSHTunnelForwarder(
            ssh_address_or_host=ssh_config['ssh'],
            ssh_username=ssh_config['username'],
            ssh_password=ssh_config['password'],
            remote_bind_address=mysql_config['mysql']
        ) as server:
            conn_config 
 
= dict(
                host='127.0.0.1',
                port=server.local_bind_port,
                user=mysql_config['user'],
                passwd=mysql_config['passwd'],
            )
            try:
                conn = pymysql.connect(**conn_config)
                with conn.cursor(pymysql.cursors.DictCursor) 
 
as cursor:
                    sql = 'SELECT VERSION()'
                    cursor.execute(sql)
                    res = cursor.fetchone()
                    logger.info('Connect Success. result: {}'.format(res))
            except Exception:
                logger.error('Connect Error. msg: {}'.format(traceback.format_exc()))