python 通过ssh访问数据库

通常，为了安全性，数据库只允许通过ssh来访问。例如：mysql数据库放在服务器A上，只允许数据库B来访问，这时，我们需要用机器C去访问数据库，就需要用C通过ssh连接B，再访问A。
通过pymysql连接mysql：

import pymysql
from sshtunnel import SSHTunnelForwarder

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

    db_connect = pymysql.connect(host='127.0.0.1',  # 此处必须是是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()

以下是自己进行事务管理，并使用peewee框架：

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

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