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In the online shopping mall, we can often see multi-level classification, sub classification and even unlimited classification. This article will show you how to implement it gracefully through Laravel Eloquent.   We will create a micro project to show the classification of children's shops, with 5 levels in total, as follows: Database migrati ...

1, Spring's transaction mechanism All data access technologies have transaction processing mechanisms, which provide API s to enable transactions, commit transactions to complete data operations, or roll back data in case of errors. Spring's transaction mechanism is to use a unified mechanism to handle transactions of different data a ...

An article to play with TiDB disaster recovery 1, Background High availability is another major feature of TiDB. All three components of TiDB/TiKV/PD can tolerate partial instance failure without affecting the availability of the whole cluster. The following describes the availability of these three components, the consequences of a single ...

Environmental Science linux: centos7.6 The most common server system in the company prometheus: 2.13.1.linux-amd64 Container monitoring solution for numerical data based on time series: with its own data storage and monitoring, it is the official monitoring scheme designated by k8s. node_exporter: 0.18.1.linux-amd64 Used to collect opera ...

Stored procedures are an important feature of database storage. Stored procedures were not supported by MySQL prior to version 5.0. Stored procedures can greatly improve the processing speed of the database and the flexibility of database programming.1. What is a stored procedure?Stored procedures are a collection of SQL statements that are de ...

1. Description 1.1 Material This paper uses the following materials: Docker Mirror Github Link Crack Tool Gitee Link With these tools, you can theoretically crack almost all versions. 1.2 Database If you choose an external database, you can create it as follows: # Create jira database and users CREATE DATABASE jiradb CHARACTER SET utf8mb4 ...

Auth module is a standard permission management system provided by Django. It can provide user identity authentication, user group management, and can be used in combination with admin module. Add 'django.contrib.auth' in installed Apus to use the app, and the auth module is enabled by default model from django.contrib ...

My hobby is to make plans, overturn plans, make plans again, and let others supervise my study, supervise my weight loss, and supervise me to change my bad habits. So I'm going to make a little program for myself. The layout of the applet interface is almost finished. Now let's register and log in your application. 1, Applet side: 1,.wxml <v ...

1, Function introduction The user enters a character in the search box to associate hot words that begin with that character in a week.   2, Functional design: 1. Hot words list Insert a piece of data each time you search   CREATE TABLE [dbo].[SearchDetails]( [Id] [uniqueidentifier] NOT NULL,--ID [KeyWords] [nvarchar](255) NOT NULL,--S ...

Learn how to improve the reliability of RabbitMQ message consumption in human resource management system, and avoid repeated consumption of messages. 1 General stay How to improve the reliability of RabbitMQ message sending in human resource management system In this paper, we ensure the reliability of message sending. However, under such a mec ...