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PHP+Jquery+Mysql realizes three-level linkage of provinces, cities and counties

Course Elementary 40235

Course Introduction：Functional realization of three-level linkage between provinces, cities and counties

Self-study IT network Linux load balancing video tutorial

Course Intermediate 11340

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 17646

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.

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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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Implementing nationwide provincial and municipal second-level linkage drop-down selection menus based on javascript_javascript skills

Course Introduction：This article mainly introduces the realization of the second-level linkage drop-down selection menu of provinces and cities across the country based on JavaScript. It analyzes in detail the implementation skills of the second-level linkage drop-down menu of provinces and cities in js in the form of a complete example. It is very simple and practical. Friends who need it can For reference

2016-05-16 comment 0 1339

Java implements dynamic loading and updating of multi-level linkage forms

Course Introduction：Dynamic loading and updating of multi-level linkage forms in Java Background: When developing web applications, you often encounter scenarios where multi-level linkage forms need to be implemented, such as the selection of three-level linkage between provinces, cities and counties. In such a form, when the user selects the upper-level option, the lower-level options are automatically loaded and updated based on the user's selection. This function can effectively reduce the user's input workload and improve the user experience. This article will use Java language to demonstrate how to implement multi-level linkage forms through dynamic loading and updating. Implementation idea: Define the data model: first need

2023-08-07 comment 0 984

13 provinces piloted the national early warning information mandatory reminder contact platform, with an average contact time of 0.23 seconds to 3.17 seconds

Course Introduction：News from this site on August 14. According to official news from the China Meteorological Administration today, as of now, the "National Early Warning Information Mandatory Reminder Reaching Platform" with mandatory reminder functions such as "flash messages" has been connected to Tianjin, Jilin, Shanghai, and Fujian 266 city and county meteorological bureaus in 13 provinces (autonomous regions and municipalities) including Sichuan and Sichuan (this site’s note: the official list has not been announced) have carried out pilot application work, and the average reach time of mandatory reminders is 0.23 seconds to 3.17 seconds. According to reports, for special emergencies and major disasters, it is crucial for grassroots emergency responders to receive early warning information as soon as possible. Since this year, the Public Meteorological Service Center of the China Meteorological Administration (hereinafter referred to as the "Public Service Center") has teamed up with China Mobile Migu Company to explore integrated screen "flash messages", intelligent voice outbound calls and many other

2024-08-14 comment 0 915

my country's fifth anniversary of 5G commercial use: user penetration rate exceeds 60% and the world's largest 5G network has been built

Course Introduction：According to news on June 7, on June 6, 2019, the Ministry of Industry and Information Technology issued 5G commercial licenses to China Telecom, China Mobile, China Unicom and China Radio and Television, marking the official launch of 5G commercial use in my country. As of today, it has been the fifth anniversary of 5G commercial use in my country. In the past five years, 5G has not only been popularized on mobile phones, but has also penetrated into various aspects such as industry, agriculture, transportation, and education. It is understood that in the past five years, my country has built a total of 3.748 million 5G base stations, 5G mobile phone users have reached 889 million, and the user penetration rate has exceeded 60%, building the world's largest 5G network. Today, from Mount Everest, the roof of the world, to 10,000-meter deep wells in Tarim, Xinjiang; from Yongxing Island in Sansha, Hainan, to the source of the Sanjiang River on the Qinghai-Tibet Plateau, our country has completed all prefecture-level cities in the country.

2024-06-07 comment 0 707

Formula Leopard 5 is about to be delivered, debuting Yunnan-P air suspension to enhance off-road performance

Course Introduction：According to news on November 22, the official poster of BYD Fang Leopard revealed that its first model Leopard 5 will be delivered nationwide starting on November 24. Customers who previously signed a contract before November 20th will gradually complete the pickup of the car in accordance with the previously announced delivery rules. For non-Cloud version orders placed on November 21st and later, the delivery time will be postponed accordingly, and the overall delivery cycle is expected Around 4 to 6 weeks. According to the editor's understanding, Fangbaobao 5 was officially launched on November 9, covering three models, priced at 289,800 yuan, 309,800 yuan and 352,800 yuan respectively. This car uses BYD's latest DMO super hybrid assembly for the first time. The body structure innovation adopts a new hybrid non-load-bearing design, and the Yunnan-P air suspension makes the Leopard 5

2023-11-22 comment 0 1349

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