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Summary A database is used to store data.As long as it's not a toy project, a database is needed for each project.MySQL is still the most used. PostgreSQL Use is also growing rapidly. In Web development, databases are also required.This article describes how to operate a database in Go Language based on MySQL.This article assumes that you alrea ...

Why use database If you want to ask where the data comes from, it may be that no matter where Xiaobai has been working for many years, he will say in unison, of course, database. So why use database? Extract: database is a "record keeping system" (the definition emphasizes that database is a ...

Recently, I practiced the springboot project, and found that the implementation of mapper.xml and DaoMapper interface class methods of mybatis framework is too arduous. Although it improves the flexibility, when there are too many tables, it is very tiring to write this part alone, so I found out how ...

concept Workflow products use activiti a lot. They come with a set of UI, which can be used directly to design processes. Here is a brief summary of its steps: 1 design model 2 publish as process. A model can publish multiple versions of process 3. Establish a process instance and instance task. A process can establish multiple parallel ins ...

Preface MySQL master-slave can better reduce the pressure of database. Today, we have a small demo. The read-only interface allows him to query the database and implement it by annotation. Code upload to code cloud:https://gitee.com/yunup/some-examples environmental information Java version 1.8 Spri ...

I met this problem last time when I was working on a personal blog project. Now let's write down the solution steps IDE: IDEA Language: java Framework: spring boot Template engine: thymeleaf 1, See the effect1. Picture submission2. Picture display2, Design process 1.pom.xml <dependency> <g ...

@3 month concentrated essence Django and Vue joint project development Project environment construction 1. Build a virtual environment Virtual environment establishment 2. Install django Activate virtual environment, install Django, build myweb project pip installation slow reference: https://blog ...

Environment CentOS7.4 mariadb 5.5 In principle, all mariadb installed from yum can be used Because the paths of / var/lib/mysql and / etc/my.cnf are the same The reason for this operation is that zabbix's history problem log has filled the disk, so you can only add a new hard disk and change the mysql storage path ------------------------- ...

Article Directory 11.1 Subquery 11.2 Use subqueries as calculated fields 11.3 Subquery Skills Prerequisite: Reference book MySQL is sure 11.1 Subquery Subqueries, as the name implies, are queries nested in other queries. Create the following tables first: ############################### # Role ...

cp command backup is a warm, full backup, the backup process needs to maintain a global read lock, this lock is more lethal to the database, it is likely to make the database hang in production environment, so it is not recommended to use in production environment. 1. Backup 1. Add a global read lock to the backup library: fl ...