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Case demonstration: 1, In the linux environment, create three nodes on one machine, and create a replica set for the purpose of testing 1. First create three different data storage folders [root@wugenqiang db]# cd /usr/local/mongodb/data/db [root@wugenqiang db]# mkdir rs0-0 [root@wugenqiang db]# mkdir rs0-1 [root@wugenqiang db] ...

Graylog build configuration (centos7) 1, Basic environment 1. jdk environment required: [root@iz2zee3zwuvnmai605c99vz ~]# java -version openjdk version "1.8.0_171" OpenJDK Runtime Environment (build 1.8.0_171-b10) OpenJDK 64-Bit Server VM (build 25.171-b10, mixed mode) //If not, you need to install it. He ...

MongoDB pipeline definition The aggregation pipeline of MongoDB will pass the results of MongoDB documents to the next pipeline after one pipeline is processed. Pipeline operations are repeatable. Common Aggregate pipeline operators of Aggregate in SpringBoot Customize the collection userCollection and initialize the data structure Store bean u ...

1. summary Pseudo code can be referred to "Twenty climbing URL and initial assumption of participle sentiment analysis" , only to find that this can be done for a whole day, but most of the time is used to deploy the server. Code placed in Large same-sex dating websites In fact, it's very si ...

mongodb reference mongoose official website mongoose is more convenient to use Using mongodb data driver to write an error log For more information on the official data-driven mongodb of node asset assertion is not used here import mongodb from 'mongodb' const MongoClient = mongodb.MongoClient const url = 'mongodb://localhost:27017/edu' expor ...

How to execute the equivalent SQL Join in MongoDB? For example, say you have two sets (users and comments), and I want to extract all comments with pid = 444 and user information for each user. comments { uid:12345, pid:444, comment="blah" } { uid:12345, pid:888, comment="asdf" } { uid:99999, pid:444, comment="qwer" } users { uid ...

0. Effect demonstration It's annoying to plug in a video.You can go out and turn right to Youku. Click on me!).   1. Preparations 1.1 Front End Framework The front end uses nuxt.js based on vue.js.Why use nuxt.js？ The first thing I did was a blog project, so SSR is important.Although it has nothing to do with the login registration described i ...

1. Course release1.1 demand analysisAfter the course is published, a formal course details page will be generated. After the course is published, users can browse the course details page and start the course learning.  The process of generating course details page by course publishing is the sam ...

I have a MongoDB set. The file format is as follows: { "_id" : ObjectId("4e8ae86d08101908e1000001"), "name" : ["Name"], "zipcode" : ["2223"] } { "_id" : ObjectId("4e8ae86d08101908e1000002"), "name" : ["Another ", "Name"], "zipcode" : ["2224"] } I can now get documents that match a specific array size: db.accommodations.find( ...

  1, query parameters in git form For git path parameters, click a link to get / lydetail?id in the URL bar, and then you can receive this id in the index.js file. The route name is / lydetail <a href="/lydetail?id=<%-item._id %>"><%-item.title %></a> <table class="table"> <tr>< ...