java operates native mongoDB to query conditions

In recent project development, the company used the native mongo for data operation, and found the following native operation methods for a long time 1. Encapsulate ip and port as ServerAddress object              ServerAddress address = new ServerAddress(ip, port);   2. Next, encapsulate the user name, databas ...

Posted on Sun, 26 Jan 2020 10:54:02 -0800 by salmon

Spring Boot Integration - MongoDB Integration 2 (MongoDB Entity Creation and Simple CRUD)

Front of Article About Versions rely on Edition springboot 2.0.8.RELEASE mongodb 4.0.14 This content is just to introduce the most basic use and configuration of mongodb. As a well-known database, it has quite a lot of advanced usage. It will expand to introduce a lot of content. Of cours ...

Posted on Thu, 23 Jan 2020 21:06:36 -0800 by rusty1001

mongodb master-slave configuration

The current test environment is on the same server, and the primary and secondary servers are distinguished by ports *Main service port: 27027 *From service port: 27028 Configuration validation file openssl rand -base64 741 > mongo.key chmod 700 mongo.key # The file needs to be copied to the primary service and the secondary service respe ...

Posted on Fri, 10 Jan 2020 09:20:29 -0800 by cityboy101

Introduction to mongoexport and mongoimport of mongodb

Environment: mongodb3.6.16 binary installation 1. Introduction to mongoexport parameters and syntax: The mongoexport tool in Mongodb can export a collection to a JSON or CSV file.Exported data items can be specified by parameters, or data can be exported according to specified conditions. Mongoexport-h IP--port port port-u username-p password- ...

Posted on Sun, 05 Jan 2020 11:27:37 -0800 by matthewc

Install MongoDB and realize remote connection under CentOS. Use of Robomongo,MongoDB Compass, a visualizer of MongoDB

1.MongoDB MongoDB is written in C + +, which is an open source database system based on distributed file storage. In the case of high load, adding more nodes can guarantee the server performance. MongoDB aims to provide scalable high-performance data storage solutions for WEB applications. MongoDB stores the data as a document ...

Posted on Mon, 30 Dec 2019 22:04:26 -0800 by matthewd

About using Eric 6 and pyqt5 to write a three-level linkage demo

New project Select the drop-down box, label and button, and a table view to display the data Click save, then select compile form to compile the code, then select form code generator, and select the following functions Click forms code generator and select To generate a function, you will have the following fi ...

Posted on Sun, 29 Dec 2019 12:52:47 -0800 by duncanmaclean

MongoDB basic installation

MongoDB overview (1) MongoDB is a database based on distributed file storage. Written in C + +. It aims to provide scalable high-performance data storage solutions for WEB applications. (2) MongoDB is a product between relational database and non relational database. It has the most abundant functions and is the most like relational database. ...

Posted on Fri, 27 Dec 2019 00:35:37 -0800 by anser316

MongoDB: select fields, limit the number of records, and sort records

1. Select field In MongoDB, the selection field is also called projection, which means that only the data of the required field is selected, rather than the data of the whole document field. If a document has five fields, but only three fields are displayed, then it is very beneficial to select only three fields. The second optional parameter t ...

Posted on Thu, 19 Dec 2019 03:44:17 -0800 by taha

Mongo 4.0.0 plus user authentication

I. database version mongo 4.0.0 II. Add user authentication for mongo 1. Create super user mongo #Note the version here (confirm that mongo is the same as the mongo of the added user) MongoDB shell version: 4.0.0 db.createUser({user:"root",pwd:"root",roles:[{role:"userAdminAnyDatabase",db:"admin"}]}) Prompt error: 20 ...

Posted on Tue, 17 Dec 2019 14:44:44 -0800 by Waldir

Using multithreading to crawl recruitment website

Use Multithread to get the information of a recruitment website, use environment py3, and directly code without saying much You can't do without the guide bag import threadingimport requestsfrom pyquery import PyQuery as pqimport jsonfrom pymongo import MongoClientfrom fake_useragent import UserAgentimport timefrom config import * I'm using Mo ...

Posted on Mon, 09 Dec 2019 21:32:47 -0800 by YOUAREtehSCENE