Tag:relationship

  • Analysis and solution of pulsar storage space not released

    Time:2021-6-11

    This article is reproduced from the official account No. StreamCloudNative, author Xue Song, who has been granted permission by the author. About Apache pulsar Apache pulsar is the top project of Apache Software Foundation. It is the next generation of cloud native distributed message flow platform. It integrates message, storage and lightweight functional computing. It […]

  • Java basic syntax. 5 basic operators

    Time:2021-5-29

    Basic operators Arithmetic operators: +, -, *, /,%, + +– Relational operators: >, =, < =, == instanceof Assignment operator:= Logical operators: & &, |,! Bitwise Operators Conditional operator Extended assignment operator Binary operator: the operator of two number operations When different operators output, if there is a long type, the output value is a […]

  • Speed up high concurrency system with NoSQL

    Time:2021-5-10

    With the advent of the Internet tide, more and more websites and application systems need the support of massive data. The requirements of high concurrency, low latency, high availability and high expansion can not be met in the traditional relational database, or the relational database has been able to cope with these requirements. After decades […]

  • The role of JDBC type in mybatis

    Time:2021-5-10

    background See colleagues using JDBC type in code, I am very confused. knowledge This is for the security of the program. In some special cases, when the passed in parameter name is empty, the program will not have problems. When the name is empty, mybatis does not know what JDBC type to convert to. In […]

  • 😎 P03 DB database constraints, table relations, modify table syntax and copy table;

    Time:2021-5-8

    Content summary constraint condition Establishing relationships (constraints) between tables Modify the complete syntax of the table Copy table constraint condition Default default “”” #Supplement: you can specify fields when inserting data create table t1 ( id int, name varchar(16) ); insert into t1 (name, id) values (‘samuel’, 1); create table t2 ( id int, name […]

  • Composer advanced command

    Time:2021-4-29

    composer dumpautoload When the project composer autoloader is updated. Instead of using composer update to load the index (update will update the entire project), use dumpautoload to do it. Two parameters are supported –optimize (-o) –no-dev composer depends Detect dependency reference https://docs.phpcomposer.com/… composer show List all available packages $ composer show doctrine/inflector 2.0.3 PHP Doctrine […]

  • Redis – Chapter 2 – Introduction

    Time:2021-4-24

    brief introduction Summary: Origin: In 2008, merzia, an Italian start-up company, launched a website statistics system lloogg based on MySQL. However, not long after, the founder of the company was disappointed with the performance of MySQL, so he decided to customize a database for lloogg himself, and completed it in 2009. It has been continuously […]

  • Webpack – HMR hot update

    Time:2021-4-8

    The article was first published inPersonal blog, welcome to pay attention~ webpack hmr webpack-dev-server In the process of using webpack dev server, if hot configuration is specified (under the premise of using inline mode), WDS will update the relevant configuration of webpack internally, that is, hotmodulereplacementplug will be added to the plugins of webpack. HotModuleReplacementPlugin […]

  • Webpack – HMR hot update

    Time:2021-4-7

    The article was first published inPersonal blog, welcome to pay attention~ webpack hmr webpack-dev-server In the process of using webpack dev server, if hot configuration is specified (under the premise of using inline mode), WDS will update the relevant configuration of webpack internally, that is, hotmodulereplacementplug will be added to the plugins of webpack. HotModuleReplacementPlugin […]

  • Description of the relationship among Swift’s date, dateformatter, datecomponents and locale

    Time:2021-4-6

    Description of the relationship among Swift’s date, dateformatter, datecomponents and locale preface It’s important for processing time to understand the relationship between these classes and what they do Class name explain be careful Date It’s just a data that represents the time. It only represents the time node, just like the timestamp DateFormatter It formats […]

  • How to delete forced from in gitlab

    Time:2021-4-4

    In gitlab, there is forced from. How to delete this? Select general in settings Then select advanced advanced options Then click the option to remove the fork relationship, and you can delete the relationship. Please note that when you delete this fork relationship, you will not be able to merge your changes into the original […]

  • Getting to know MySQL

    Time:2021-3-27

    Initial MySQL Why study database? Job skill requirements How to store data In programs and websites, a large amount of data needs to be stored for a long time Database is almost the core of software system What is a database? Database is a warehouse that organizes, stores and manages data according to data structure. […]