MongoDB download, installation and Robot 3T connection

MongoDB MongoDB is written in C + +, a non relational database (NoSQL) for document storage.Homepage: https://www.mongodb.com/2 1. Download Mode 1: Download address of official website: https://www.mongodb.com/try/download/community Mode 2: Download address of official website: http://dl.mongodb.org/dl/win32/x86_64 (the versi ...

Added by BioBob on Fri, 04 Mar 2022 02:45:05 +0200

Some of the C language deserve to be defined as the beautiful macro definition of the common C language header library

Original text connection: https://mp.weixin.qq.com/s/OICAfQgMKWfBLuZbp2gCBw Writing C language well, beautiful macro definition is very important. Using macro definition can prevent errors, improve portability, readability, convenience and so on. Here are some macro definitions commonly used in mature software. 1. Prevent a header file from b ...

Added by HuggieBear on Fri, 04 Mar 2022 02:39:18 +0200

Do you know the lexical environment? What does it have to do with closures?

Lexical Environment Official definition Official ES2020 The Lexical Environment is defined as follows: A Lexical Environment is a specification type used to define the association of Identifiers to specific variables and functions based upon the lexical nesting structure of ECMAScript code. A Lexical Environment consists of an Environment ...

Added by wilded1 on Fri, 04 Mar 2022 02:32:47 +0200

Getting started with Spring Data JPA

Overview of Spring Data JPA Overview of ORM Object Relational Mapping (ORM, or O/RM, or O/R mapping) is a program technology used to realize the conversion between data of different types of systems in object-oriented programming language. In effect, it actually creates a "virtual object database" that can be used in the programm ...

Added by SuprSpy79 on Fri, 04 Mar 2022 02:26:28 +0200

20 lines to simply implement an unstated next

preface ๐Ÿ“ ๐Ÿ‘‰ unstated-next State management based on React mental model (hook+context). ๐Ÿ‘ˆ [the external chain image transfer fails. The source station may have an anti-theft chain mechanism. It is recommended to save the image and upload it directly (IMG uhrmuffj-1618884145855)( https://raw.githubusercontent.com/blazer233/unstated-next ...

Added by raydona on Fri, 04 Mar 2022 02:23:28 +0200

Analysis of Java collection source code -- HashMap

1, Member variables in hashMap. Because there are many member variables in hashMap, they are listed here first. Can be more clear. // Default initial capacity (array default initialization size) static final int DEFAULT_INITIAL_CAPACITY = 1 << 4; // 16 // Maximum capacity static final int MAXIMUM_CAPACITY = 1 << 30; // // Default ...

Added by sarathi on Fri, 04 Mar 2022 02:07:55 +0200

Click the link in Chrome or Firefox browser to automatically open IE browser, jump to the specified page and pass parameters

Requirements: Click the link in Chrome browser, open IE browser, jump to the specified page and pass the parameters Solution: Some applications can start and perform operations by clicking the URL link (e.g. Xunlei). How does this happen? It mainly registers the URL Protocol by modifying the registry. Phase 1: click the link to op ...

Added by woozy on Fri, 04 Mar 2022 01:51:06 +0200

k8s cluster deployment and container application deployment

Because the departmental oa system is deployed in the form of multi tenancy in k8s, it usually only solves some common errors in k8s. I have always wanted to seriously study the deployment process of k8s. After all, I know that the problems can be solved faster after the deployment process, so I took the time to study it. 1, k8s common compo ...

Added by mosherben on Fri, 04 Mar 2022 01:42:14 +0200

Python learning notes

Write in front python has been studied several times in succession, and began to learn it in college. They all learned some leather and didn't stick to it. They have been in contact with basic grammar, regularity, Socket and reptiles. I do a lot of java and I don't use it at ordinary times, so I haven't had a systematic note for myself to re ...

Added by RabidKoala on Fri, 04 Mar 2022 01:40:38 +0200

HarmonyOS tripartite Component Development Guide (18)-Flexbox streaming layout component

catalog: 1. Introduction 2. VideoCache User Guide 3. VideoCache Development Guide 4. Collection of articles in the "HarmonyOS tripartite component development guide" introduction In the previous article, I introduced the component use and development guide of the bottom navigation bar. This article will bring you another impleme ...

Added by BoukeBuffel on Fri, 04 Mar 2022 01:38:10 +0200