Node.jsConnect mongodb

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 C:\Users\admin\Desktop\fml> ...

Posted by fredi_bieging on Thu, 02 Jul 2020 07:53:41 -0700

Rent price analysis of rental housing in Shanghai

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 backup restore common commands

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

Day 29 of egg learning notes: using mongoose in eggjs

1, Mongoose in egg 1. Installing mongoose in an egg project cnpm i mongoose --save 2. Configure the eg mongoose plug-in in config > plugin.js exports.mongoose = { enable: true, package: "egg-mongoose" }; 3. Configure the database connection address in config > config.default.js config.mongoose = { client: { // url ...

Posted by abisai on Mon, 11 May 2020 10:12:07 -0700

24 days of egg learning notes: mongoose default parameters, modular

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 Mongodb to implement punch in and sign in system

Using excel file to import data and integrating mongodb to implement punch in system Environmental parameters 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 <dependency> <groupId>o ...

Posted by shinephp on Sun, 03 May 2020 07:56:41 -0700

Analysis of MongoDB Java operation syntax

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

linux builds php performance analysis tool

First on the renderings: Installation environment Centos,php7,MongoDB3,nginx php extension mongodb: http://pecl.php.net/package/mongodbtideways_xhprof: https://github.com/tideways/php-xhprof-extension Install MongoDB3 By default, MongoDB2 is installed in my environment yum. xhgui requires version 3 or above. Create a yum source for MongoDB3 vi ...

Posted by dkjariwala on Sat, 11 Apr 2020 08:17:19 -0700

Mongodb version 4.2 replica set configuration

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 Server information: 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

Mongodb backup restored to any point in time

Description: 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