将Including array as a dependency in useEffect

There is some data coming in from the long poll every 5 seconds and I want my component to dispatch an operation every time an item of the array (or the array length itself) changes. How can I prevent useEffect from going into an infinite loop when passing an array as a dependency, but still manage ...

P粉748218846 2023-10-17 18:50:23 0 2 207

How to display output in % using this case condition in clickhouse database

How can I use this case condition in clickhouse database to display the output in % form. ROUND(count(distinctcasewhenbt.status='approved'thenbt.idelsenullend)/count(distinctp.id)*100)as"SR-txns"

P粉237125700 2023-09-15 00:07:20 0 1 360

MySQL method to extract all keys in nested JSON string

In addition to this answer, is it possible to extract the nested keys in a simple way? Example: {"a":value,"b":{"c":value,"d":{"e":value}}} Expected output: ['a','b.c','b.d. e'] What I've tried: SELECTf.`id`AS`field_name`FROMtablet,JSON_TA

P粉257342166 2023-08-28 14:17:16 0 1 296

The title is rewritten as: Use Sequelize to count the number of rows in related tables

Using sequelize and mySQL, I have two tables: User and Post. The relationship between the two tables is M: Ndb.User.belongsToMany(db.Post,{through:"Likes",as:"Liked"});db.Post.belongsToMany(db.User,{through:"Likes ",as:"Likers&q

P粉792026467 2023-08-27 22:35:45 0 1 183

The title is rewritten as: The module appears to be a WebAssembly module, but it is not flagged as such for webpack.

I'm trying to import a WebAssembly module in my Vue project (written in Rust and compiled with wasm-pack). What I did was create a project: vue-clicreatemy-vue-webasm-proj I chose Vue2. After that I modified my main.js like this (added asyncbeforeCreate()): /*main.js*/importVuefrom'vue'importAppfrom...

P粉176980522 2023-08-25 23:56:27 0 1 221

Trying to access a null type value using array offset

I have a php bot (on IRC) and since I updated php and mysql to the latest versions of CentOS I'm getting this error unset($ops_activos);unset($voices_activos);if($on_pthelp==1) {if($ops["#pthelp"]['count']>0){foreach($ops["#pthelp"]as$valu

P粉334721359 2023-08-25 09:40:08 0 1 236

Ranking function in MySQL

I need to find out the ranking of customers. Here I add the corresponding ANSI standard SQL query according to my requirements. Please help me convert this to MySQL. SELECTRANK()OVER(PARTITIONBYGenderORDERBYAge)AS[PartitionbyGender],FirstName,Age,GenderFROMPerson Is there a function to query ranking...

P粉310754094 2023-08-24 00:03:12 0 2 213

"Similarities and differences between import * as React from 'react'; and import React from 'react';"

I noticed that React can be imported like this: import*asReactfrom'react';...or imported like this: importReactfrom'react'; The first way imports all the contents of the react module (see: importing the contents of the entire module) The second way The method only imports the default module exports ...

P粉596161915 2023-08-22 19:59:28 0 2 181

Rewrite the title as: Translate "Array as session variable" into Chinese as "Use array as session variable"

In PHP, is it possible to set an array as a session variable? The situation is that I have a table (first page) in which some cells have links to specific pages. The next page will have a list of names (the second page, which I want to save in a session array) with corresponding checkboxes. After su...

P粉833546953 2023-08-21 18:07:56 0 2 246

How to properly handle expected parameter errors encountered

functioncalculate(){echo"Number of parameters:".func_get_args();echo"The third parameter is:".func_get_arg(3);print_r(func_get_arg());$result=0;foreach(func_get_arg()as$ arg):$result+=$arg;endforeach;echo$result;c

P粉976737101 2023-08-16 17:36:54 0 1 281

Binding a PHP array for SQL insert

Try binding an array (1starraybind) to prevent SQL injection. This is the code that works: if(isset($_POST['checkbox_selected'])){$valuesArr=array();foreach($_POST['checkbox_selected']as$key=>$value){//Retrieve array ID To find the row number of the CSV option column $findrow=array_search

P粉928591383 2023-08-08 15:51:43 0 1 292

GROUP_CONCAT using the CASE statement can produce multiple outputs.

I have a SQL query that contains the following line of code: GROUP_CONCAT(CASE WHEN t3.ship=1 AND t4.item=0 THEN t2.item_name END ORDER BY item_id SEPARATOR '') AS `MyItemList`. The current output is: Lamp. It's working fine, but I want the item number stored in the item_no column to be displayed in...

P粉652495194 2023-07-25 08:17:06 0 1 310

Find users who visit only one city instead of multiple cities in MySQL [duplicate]

I have a table with user ID, city and booking date. I need to find out which users visited only one city within a date range, not multiple cities. SELECT user_id, city, COUNT(*) as result FROM visits WHERE start_ts >= 1675209600 -- 1675209600=01.02.2023 00:00 AND end_ts <= 1675295999 -

P粉764785924 2023-07-24 22:47:07 0 1 300

Please tell me about PHP encryption reverse operation and how to modify it.

Currently: The current encryption result is random 0-9 items that are not encrypted and the rest are all encrypted. The desired result is: 0-9 items are randomly encrypted and the rest are not encrypted. $fileNameArr = scandir($dir2);foreach ($fileNameArr as $fileName) { if ($fileName != '.' &&a...

P粉268709102 2022-08-13 23:18:14 0 0 534

Using the from method to find the latest products under each column, why are the results incorrect?

Use the from method to find the latest products under each column, why are the results incorrect? select goods_id,cat_id,goods_name from (select * from goods where 1 order by cat_id asc,goods_id desc)as tep group by cat_id;

P粉441358353 2022-08-09 13:50:58 0 2 485

I would like to ask someone about the problem of thinkphp operating database. How to keep the latest 20 entries and clear the redundant ones if they are larger than 20?

if($logNums >= 20) {$logList = $tableLog->limit(20)->order("id", "asc")->select();foreach($logList as $k => $v){$condition[] = $v['id'];}$tableLog->where(

P粉448732323 2022-04-24 12:05:55 0 1 769

How to write third-level menu

foreach ($menus as $menus_v){ if ($menus_v['parent_id'] == 0) { $a[$menus_v['smi

御疆干果 2022-01-10 12:55:23 0 1 702

Error report of sql concat

Choose from the options below and concatenate the "city" and "state" columns, separated by commas, into a new custom column called "new_address". SELECT ___()____ new_address FROM customers; This is how I filled it in SELECT concat( city,',',state) as

Ping 2021-11-03 19:22:19 0 6 842

Why are the column names and comments of the query table displayed like this in mysql?

I want to query the column names and comments of the table. The language names are as follows, SELECT column_name AS 'field name', data_type AS 'field type', column_comment AS 'field description' FROM information_schema.COLUMNSW

文韬 2021-05-30 22:08:49 0 0 833

Brother, please help me to display the content associated with the table in php.

{foreach $users as $u } {$u.role.id} {switch name='$u.role'} &

ōóǒò 2021-05-08 15:06:27 0 0 524