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Self-study IT network Linux load balancing video tutorial

Course Intermediate 11273

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Shangxuetang MySQL video tutorial

Course Advanced 17597

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Band of Brothers front-end example display video tutorial

Course Advanced 11309

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

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Ways to fix issue 2003 (HY000): Unable to connect to MySQL server 'db_mysql:3306' (111)

I recently tried to containerize my FastAPIPython server (also for replication/doubling purposes). Before, I had just a MySQL server in a Docker container and everything was fine, but when I also made my web server a service, it couldn't connect to the MySQL server, so now the application doesn't work. Below is the code snippet of the server database initialization connector in the application fromfastapiimportFastAPIimportmysql.connectorapp

2023-09-05 11:18:47

Experiment with sorting after query limit

So this is my first question here, please forgive me if something is wrong. I'm trying to make a sort query based on constraints. So there is a Customers table with 90 records. I want to first perform a query limited to 3 records, and then sort the results of this query by a column called ContactName. I think this might be a nested query. Nested queries run fine in SQLServer, but don't know how to implement it in MySQL. Limit query: Select*fromcustomerslimit

2023-09-05 14:46:42

CSS Grid: Create new row when child content overflows column width

I have a two column layout based on CSS grid. When the content of the second column exceeds 1fr I want to create a new row. As it currently stands, the content simply overflows the column. One requirement of this layout is that the items in the right menu column are in one row. I achieve this with: .right-menu{...grid-auto-flow:columndense;...} If I remove the grid-auto-flow attribute, the overflow stops. However, the items are now stacked into multiple rows, which is not what I want. I also tried converting .ri

2023-09-05 15:18:28

PHP full text search functionality using AND, OR and NOT operators

Newbie question: I'm trying to implement a full text search on a search string using php and eloquent. $searchstring="+(victimsuspect)+crime-covid";$searchresult=RssItem::whereRaw("MATCH(description)AGAINST('$searchstring'INBOOLEANMODE)")->ge

2023-09-05 15:06:32

Shortest way to convert all PHP types to string

I'm writing a general system that I hope can one day be applied to fields like medicine (i.e. it's "scientific"). I think the best way is to represent all the data in php with strings (true will be "true", false will be "false" and so on). The reason for this is that in php any value has a unique string representation (such as the php code itself). I post this question to speed up the design process of this program. Some values are easily converted to strings: numbers, booleans, etc. Some are not easy: objects, arrays, resources. I think the transfer object and

2023-09-05 15:34:44

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How to jump to 404 in laravel

Course Introduction：Laravel is a popular PHP development framework that makes it easy to build efficient web applications. While creating your application, you may encounter many HTTP errors such as 404 errors. This article will focus on how to redirect traffic in your Laravel application to a custom 404 error page. By default, Laravel provides a simple 404 error page that contains just a simple message: "Not Found". While this is sufficient for simple websites,

2023-04-23 comment 0 1214

What software is cdr What is cdr

Course Introduction：cdr is the source file storage format of the software CorelDraw. Tutorial Applicable Model: Lenovo AIO520C System: Windows 10 Professional Edition: CorelDraw2021 Analysis 1cdr is the source file storage format of the software CorelDraw. It is a vector file. Similarly, we can use CorelDraw software to open cdr files. This software provides various functions such as vector animation materials, interface design, website construction, bitmap writing, and web page animation. It is a design and typesetting software for designers and printers. Supplement: What is cdr software for? 1CDR’s full name is CorelDraw. It is a vector drawing software. It is a common design and drawing software and is widely used.

2024-02-22 comment 0 1510

HTML images cannot be displayed

Course Introduction：HTML is a commonly used language for web page production, and pictures, as one of the important elements in web design, can increase the visual effect of the page and make the web page more vivid. However, in the actual process of making web pages, we will encounter the problem that pictures cannot be displayed. This article will focus on this problem to analyze the reasons and solutions for this problem. 1. Reason 1. Wrong image path In web page production, the code linking to the image usually starts with the img element, in which the src attribute specifies the path of the image. If the path is not specified correctly, the image will not be displayed. 2. Figure

2023-05-21 comment 0 11613

Reasons and solutions for why HTML does not display images

Course Introduction：Reasons why HTML does not display images and solutions HTML (Hypertext Markup Language) is a markup language used to create websites. It can add various elements to realize various functions of the web page. Among them, pictures are one of the indispensable elements in web design. However, in actual use, it often happens that HTML images cannot be displayed, which may cause some trouble. This article will introduce relevant knowledge about HTML not displaying images from two aspects: reasons and solutions. 1. Reason 1.1 The path is wrong or the image cannot be found when in <img>

2023-04-21 comment 0 14803

How to analyze data link protocols HDLC and PPP

Course Introduction：1. Commonly used data link protocols (HDLC, PPP) (1) The idea of analyzing the protocol Step 1: Understand the overview of the protocol, know the purpose and basic characteristics of this protocol design Step 2: Use the protocol data unit (for the data link layer The format of the frame) is the main clue to study the specific implementation of the protocol. Step 3: How does the protocol solve practical problems? (2) HDLC protocol (Advanced Data Link Control Protocol) (bit-oriented protocol) HDLC protocol is a bit-oriented protocol, which mainly solves data link layer link management, addressing, frame synchronization, error control, and flow control , which has two characteristics: equilibrium system and non-equilibrium system. 1. Composition of HDLC: frame structure (syntax) procedure elements (syntax) rule type (semantics) usage

2023-05-12 comment 0 2541

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