php - In a production environment, how can we add indexes to MySQL and modify the table structure so that our online business is not affected?

In a production environment, how can we add indexes to MySQL and modify the table structure so that our online business is not affected? Because there are writing and reading operations to the library at any time online.

某草草 2017-05-27 17:38:57 0  1  726

javascript - js requirements ideas

The html structure is as shown above. Please give me some ideas~~ Now there are several a with click events. The following is the same ul. How can I make the input data in the ul not affect each other when clicking on different categories and save the selected one after switching? quantity?

漂亮男人 2017-05-19 10:16:57 0  3  425

SSL encryption parameters for nginx specific URL cannot be passed

In the environment, there is nginx at the front end and tomcat at the back end. Now it is necessary to encrypt SSL requests from the client to nginx. Considering the impact of speed, only dynamic requests are encrypted (that is, all requests ending with .do), other js/png, etc. The file is not encry...

漂亮男人 2017-05-16 17:24:01 0  2  610

Recursive call - javascript recursive array recursion problem

Now there is a need to assemble a tree node based on the data requested by the server, that is, the parent-child node. The data structure after the server request is as shown below. Topology is an object, and the key under the object is a parent and value. is the child array. For example, 1 in the p...

阿神 2017-06-26 10:50:17 0  3  958

Register additional hooks in NuxtJs project using Vue class components

I'm building my first NuxtJs project and I'm also using Vue class components to write my components as classes. After applying a Vue class component, I have issues accessing the beforeRouteEnter component hook (it is no longer called). So I found documentation on registering additional hooks when us...

P粉904450959 2024-03-27 08:38:00 0  1  436

Extend PHP classes used internally without changing dependencies

I want to override a PHP class in Laravel, but it is being extended by several other classes that I don't want to bother with. The overall structure is as follows classAextendsR{}classBextendsR{}classCextendsR{}classDextendsR{}where A/B/C/D/R are all classes in the external package. I want to extend...

P粉278379495 2024-01-10 17:24:16 0  1  390

How performant is Vue 3's provision/injection?

The project I'm working on relies on application-level providers for global state management. At first, the provided object is small, but it grows as the project grows. How much impact will injecting this object where the data is required have on application performance? Without implementing a globa...

P粉946336138 2023-08-26 09:46:02 0  1  566

How to insert specific string into page meta tag using JavaScript

I need this for SEO optimization. The website I'm working on has a small set of pages that are generated dynamically, but their metadata is very generic - even though these 5 (different) pages have relatively different content, their titles and descriptions are the same, and I want Avoid this situat...

P粉904191507 2023-09-16 20:17:07 0  1  714

SQL - How to get the latest entry between two different tables? (The timestamp is not stored)

I'm working on an ongoing project in which I'm dealing with quotes and the database structure is not well organized and I can't make much changes to the database schema to fix it. In the database: two types of quotes and saved in two different tables. Assume regular_quotes and premium_quotes are two...

P粉244155277 2023-09-07 00:14:25 0  1  611

What does external link resources mean?

External link resources are also called incoming links, external links, friendly links, etc. To do SEO, you must know how to use external link resources. External links are links from other websites to your website. The other website can be the homepage or internal page, and the link pointing to you...

dasein58 2021-09-20 00:25:25 0  1  1559

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 wo...

P粉178132828 2023-09-05 11:18:47 0  1  830

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 ContactNam...

P粉237125700 2023-09-05 14:46:42 0  1  730

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: ...

P粉212114661 2023-09-05 15:18:28 0  1  619

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

P粉076987386 2023-09-05 15:06:32 0  1  581

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...

P粉369196603 2023-09-05 15:34:44 0  1  1009

How to get average of DATETIME column in MySQL while grouping by other columns

I'm creating and populating a MySQL table using the following query: SETtime_zone='+00:00';CREATETABLEtimestamp_n_datetime(idINT,timeDATETIME,avg_timeDATETIME);INSERTINTOtimestamp_n_datetime(id,time,avg_time)VALUES("1","2023-01-0310:

P粉460377540 2023-09-05 11:46:21 0  1  508

Multi-device (mobile phone) synchronization - React Native

I'm trying to create a Lightshow that will launch on all users' mobile devices at the same time (can have up to 2000-3000 users). All users will use the Internet (Wi-Fi or mobile data). In our FE we use Apollo for subscriptions and it works like a charm. But the problem is, user A can get subscribed...

P粉151466081 2023-09-05 11:58:38 0  1  701

Spades, Diamonds, Hearts, Clubs => styles do not change font color in Chrome for Android

In Google Chrome on Windows, the card suit symbols (spades, hearts, diamonds, clubs) are colored correctly using the "style" attribute. Unfortunately, the same page displayed in Google Chrome on Android does not display the colors I defined but uses the default black and red. (See the atta...

P粉896751037 2023-09-05 15:25:13 0  1  762