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Self-study IT network Linux load balancing video tutorial

Course Intermediate 11328

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 17632

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 11339

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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Python Blockchain Development Tips: Make Your Blockchain Project Stand Out

Course Introduction：Python is an easy-to-learn, powerful programming language that is ideal for blockchain development. Python has a wealth of libraries and tools that can help you quickly build blockchain projects. In this article, we will share some Python blockchain development tips to help you create outstanding blockchain projects. 1. Use the right tools Python has a wealth of blockchain development libraries and tools that can help you quickly build blockchain projects. These libraries and tools can help you manage blockchain transactions, create smart contracts, develop dApps, and more. When choosing a blockchain development tool, you need to consider the following factors: Ease of use: Is the tool easy to use? Performance: How does the tool perform? Security: Is the tool safe? Community Support: The

2024-02-24 comment 0 1329

What is the organization that operates the blockchain node? How to manage blockchain nodes?

Course Introduction：Blockchain node operators refer to nodes that provide consensus services in the blockchain network, also known as validators (Validator) or bookkeepers (Bookkeeper). Operators maintain the security and stability of the entire blockchain network by participating in the calculation process of the consensus algorithm to verify transactions and package blocks. In some blockchains, operators also play the role of management nodes, such as allocating resources, supervising network upgrades, etc. A simple introduction can’t let everyone understand what a blockchain node operator is? Next, I will introduce it to you in detail. What is a blockchain node operator? A blockchain node operator is an entity or individual responsible for managing and maintaining blockchain network nodes. A blockchain network consists of multiple nodes, each of which contains

2024-01-19 comment 0 1615

What is a blockchain oracle? What are the functions of blockchain oracles?

Course Introduction：The indispensable thing to connect the digital world of blockchain with the real world is blockchain oracles. They are like the eyes and ears of blockchain, ensuring the ability to interact with the outside world. Blockchain technology is not only a A static ledger, but a dynamic system that affects and reacts to the real world. So what exactly does this blockchain oracle mean? Simply put, it is a mechanism that connects the blockchain and external data, allowing smart contracts to obtain and use information that occurs outside the blockchain. The editor below will tell you in detail. What does blockchain oracle mean? A blockchain oracle is a third-party service that provides external data to the blockchain. They act as a bridge between on-chain and off-chain systems. Although the closed nature of blockchain ensures security and trustworthiness, many applications

2024-01-27 comment 0 1227

What is blockchain technology? What knowledge is required for blockchain technology?

Course Introduction：Blockchain technology is a distributed ledger technology used to record transactions and maintain secure, transparent, and immutable data. To understand and apply blockchain technology, the following knowledge is required: cryptography, data structures, computer networks, software development, blockchain concepts and application areas.

2024-07-18 comment 0 980

Blockchain in PHP

Course Introduction：With the continuous development and application of blockchain technology, it has become a hot topic and received widespread attention. Blockchain technology is not only used in digital currency transactions, but also in finance, medical, logistics and other industries. In terms of programming, blockchain technology also has many applications, among which blockchain in PHP is a very interesting field. PHP is a scripting language widely used in Web development. It is easy to learn, easy to use, and flexible, so it is widely used in Web development. Blockchain technology is a cryptographic

2023-05-26 comment 0 2177

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