If you don't know this before reading this article, you won't simply use mongodb. Stamp here
1. Install mongodb dependency, here we install v2.2.33, if we've encountered it beforeDb.collectionIs not function is really just a mongodb library version issue (desktop creation of fml files)
My project file name is fml
Posted by fredi_bieging on Thu, 02 Jul 2020 07:53:41 -0700
Rent price analysis of rental housing in Shanghai
In this paper, we use crawler to crawl the housing rental data of Shanghai, and use python to clean, analyze and display the data, and carry out data mining modeling and prediction for housing rent.
# Import related packages
import pandas as pd
import numpy as np
import seaborn as sns
import ma ...
Posted by Calamity-Clare on Mon, 29 Jun 2020 19:46:08 -0700
Mongodb's export mongodump is used in combination with mongorestore import tool. Can be used for database backup and restore.
mongodump is a utility for creating binary exports of database content. mongodump can export data from mongod or mongos instances; that is, it can export data from independent, replica set and shard cluster deployment.I ...
Posted by rmbarnes82 on Wed, 27 May 2020 06:10:35 -0700
1. mongoose default parameter: when adding data, if no data is passed in, the data configured by default will be used.
Connect to the database, a warning is reported below, useNewUrlParser:true
This attribute will identify the db needed to verify the user in the url. You do not need to specify it before upgrading. You must specify it before u ...
Posted by grungefreak on Sun, 03 May 2020 08:26:24 -0700
Using excel file to import data and integrating mongodb to implement punch in system
Development tools: IDEA
Basic environment: Maven+JDK8
Main technologies: SpringBoot, Mongodb
Spring boot version: 2.2.6
The implementation steps are as follows:
1. Add dependency
Posted by shinephp on Sun, 03 May 2020 07:56:41 -0700
The connection between Java and mongodb
1. Single mongodb
Mongo mg = new Mongo();//The default connection port of 127.0.0.1 is 27017
Mongo mg = new Mongo(ip);//You can specify that the ip port defaults to 27017
Mongo mg = new Mongo(ip,port);//ip and port can also be specified
2. Connect two mongodb s
//ip is the host ip address, port is the ...
Posted by aliahmad on Sat, 02 May 2020 22:55:28 -0700
First on the renderings:
mongodb: http://pecl.php.net/package/mongodbtideways_xhprof: https://github.com/tideways/php-xhprof-extension
By default, MongoDB2 is installed in my environment yum. xhgui requires version 3 or above.
Create a yum source for MongoDB3
Posted by dkjariwala on Sat, 11 Apr 2020 08:17:19 -0700
Common replication sets
The common architecture of online environment is replica set, which can be understood as one master and many slaves.
Below: 1 master and 2 slave
Below: one master one slave one arbitration
Three machines are configured with 2-core 16G memory storage disk 100G
"host" : "10.1.1.159:27020""host" : "1 ...
Posted by mojodojo on Thu, 09 Apr 2020 09:13:50 -0700
According to the technical feedback, some people mistakenly deleted the online mongodb table data in the morning, the user has feedback to the customer service, now it is necessary to restore the data to the user.
The first step is to determine the schema of the database for deleted data
1.1, Single point:If there is a backup, sta ...
Posted by eva21 on Thu, 09 Apr 2020 01:13:27 -0700