python的单例模式 连接mongo数据库

数据库的增删改查都先要链接数据库,不然到处都在链接数据库,很烂费资源和性能,今天就把mongo的连接池的单例模式封装了一下,希望大家多多指教:

# -*- coding: utf-8 -*-
"""
 @Time   : 2020/11/23 16:36 
 @Athor   : LinXiao
 @功能   :
"""
import os
import sys

from pymongo import MongoClient

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))


class MongoDBClient(object):
    # 饿汉式 单例模式
    def __new__(cls):
        if not hasattr(cls, 'instance'):
            cls.instance=super(MongoDBClient, cls).__new__(cls)
        return cls.instance

    # 代理ip Redis 连接池
    def __init__(self):
        # uri='mongodb://账号:密码@128.777.244.19:27017/admin'
        # self.mgdb=MongoClient(uri, connect=False, maxPoolSize=2000)
        local_host='localhost'
        local_port=27017
        self.local_client=MongoClient(local_host, local_port, connect=False, maxPoolSize=2000)

        # 线上mongo验证
        online_host="145455.12.122线上mongo地址"
        online_port=27017
        client=MongoClient(online_host, online_port,connect=False, maxPoolSize=2000)
        db_user='dbwd'
        password='fpy#线上mongo密码'
        db=client.test                 # 注意:# 先连接系统默认数据库admin
        db.authenticate(db_user, password, mechanism='SCRAM-SHA-1')
        self.online_client=client

    def getMongo_Local_Client(self):
        return self.local_client

    def getMongo_Online_Client(self):
        return self.online_client


# if __name__ == '__main__':
#     mongo=MongoDBClient().getMongo_Online_Client()
#     mongo_insert=mongo['test']["test111111"]
#     data={"linxiao": "handsome"}
#     mongo_insert.insert_one(data)
#
# 类方法继承
class AA(MongoDBClient):
    def __init__(self):
        super().__init__()

    # def get_data(self):



if __name__ == '__main__':
    a1=AA()
    a2=AA()
    print(id(a1), id(a2))

运行结果:

说明是同一个对象,单利完成!