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Self-study IT network Linux load balancing video tutorial

Course Intermediate 11245

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 17581

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 11291

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 connect the wall-hung boiler to the thermostat (how to achieve wireless connection between the wall-hung boiler and the thermostat)

Course Introduction：With the development of smart homes, wireless connection between wall-mounted boilers and thermostats has become a trend. This article will introduce the connection method between the wall-mounted boiler and the thermostat to help readers understand how to achieve wireless connection. Choose a thermostat suitable for a wall-hung boiler. Choose a thermostat suitable for a wall-hung boiler based on the model and brand of the wall-hung boiler. The thermostat needs to have the function of communicating with the wall-mounted boiler. Understand the communication methods of wall-hung boilers. Different models of wall-hung boilers may use different communication methods, such as Wi-Fi, ZigBee, etc. Before choosing a thermostat, you need to understand the communication methods supported by the wall-hung boiler to ensure that the thermostat and wall-hung boiler communicate properly. 1. Connect the power supply of the thermostat and the wall-hung boiler. Both the thermostat and the wall-hung boiler need power to work properly, so they need to be connected to

2024-07-16 comment 0 543

How does a thermostat work?

Course Introduction：The working principle of the thermostat is to sample and monitor the ambient temperature through a temperature sensor, and then start or stop the heating or cooling equipment through the control circuit based on the difference between the set temperature value and the actual detected temperature value, thereby To achieve the purpose of keeping the temperature within the set value range. Detailed introduction: 1. Sampling and monitoring of temperature sensor. The temperature sensor is a key component of the thermostat. Its function is to detect the ambient temperature and convert the detected temperature value into an electrical signal, and then pass it to the control circuit for processing. The temperature sensor Generally, thermistors, thermocouples, etc. are used.

2023-09-18 comment 0 3499

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