mongodb basic statement operation

Basic operation of mongo database

1、{ “authors.name” : { $type : 2} }

2、{ ‘authors.org’: { $type : 4} }

Query whether there are list objects in the org field under the author field, which should be all object types.
https://docs.mongodb.com/manual/reference/operator/query/type/

Overview
https://docs.mongodb.com/manual/reference/glossary/#std-term-BSON

3、{ ‘venue.sid’: { $exists: false } }

Query records that do not exist in this field
https://docs.mongodb.com/manual/reference/operator/query/exists/

4、{’_id’:ObjectId(‘5feee51891e0113b2659fd0e’)}

5. **Class of database connection**

#-*- encoding: utf-8 -*-
 
from calendar import day_name
import pymongo
from config import mongodb_ip,mongodb_port

"""
    使用方法如下所示：
    table_database=mongodb_connect.MongoDBUtil('web')
    #  传入你要使用的数据库名称
    table_uesrEventLog=table_database.create_database('user_event_log')
    #  传入你要使用的数据表名称

"""
class MongoDBUtil:
    """
    MongoDB工具类
    """
    def __init__(self,db_name=None):
        """构造函数"""
        self.mongo_client = pymongo.MongoClient(host=mongodb_ip, port=mongodb_port)
        self.mongo_auth_db = self.mongo_client.aminer
        self.mongo_auth_db.authenticate(name="aminer_platform_reader", password="Reader@123", mechanism="SCRAM-SHA-1")
        self.mongo_db_web = self.mongo_client[db_name]
    def __del__(self):
        """析构函数"""
        # print("__del__")
        self.mongo_client.close()
    def create_database(self, table_name):
        self.table_uesrEventLog = self.mongo_db_web[table_name]
        """创建数据库"""
        return self.table_uesrEventLog