通常，為了安全性，資料庫只允許通過ssh來訪問。例如：mysql資料庫放在伺服器A上，只允許資料庫B來訪問，這時，我們需要用機器C去訪問資料庫，就需要用C通過ssh連線B，再訪問A。
通過pymysql連線mysql：

import pymysql
from sshtunnel import SSHTunnelForwarder

with SSHTunnelForwarder(
        (sshServerB_ip, sshServerB_port),  # B機器的配置
        ssh_password=sshServerB_pwd,
        ssh_username=sshServerB_usr,
        remote_bind_address=(databaseA_ip, databaseA_port)) as
 
 server:  # A機器的配置

    db_connect = pymysql.connect(host='127.0.0.1',  # 此處必須是是127.0.0.1
                                 port=server.local_bind_port,
                                 user=databaseA_usr,
                                 passwd=databaseA_pwd,
                                 db=databaseA_db)

    cur = db_connect.cursor()
    cur.execute('call storedProcedure'
 
)
    db_connect.commit()

以下是自己進行事務管理，並使用peewee框架：

from peewee import *
from playhouse.db_url import connect
from sshtunnel import SSHTunnelForwarder

server = SSHTunnelForwarder(
        (sshServerB_ip, sshServerB_port),  # B機器的配置
        ssh_password=sshServerB_pwd,
        ssh_username=sshServerB_usr,
        remote_bind_address=(databaseA_ip, databaseA_port))  # A機器的配置
 

server.start()
destination_lib = connect('mysql://%s:%[email protected]:%d/%s' % (databaseA_usr, databaseA_pwd, server.local_bind_port, databaseA_db))
'''
your code to operate the databaseA
'''
server.close()