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How to efficiently synchronize data in python multi-process or multi-thread?

In multi-threads/multi-processes, tasks can be easily obtained through queues and the like. But when the task is completed, in order to count the number of completed tasks, a value needs to be accumulated. In the current multi-thread/multi-process situation. I use thread lock/process manager + proce...

怪我咯 2017-06-12 09:24:09

How to implement multi-level menu in mini program

How to implement multi-level menu in mini program

简单 2019-09-19 19:29:45

How to do multi-condition filtering in PHP mall?

How to do multi-condition filtering in PHP mall?

tianya 2018-03-06 13:46:15

Does field order matter in multi-column index in MySQL?

I know the importance of indexes and how join order changes performance. I've read a lot related to multi-column indexes but didn't find an answer to my question. I'm curious if the order in which they are specified matters if I do a multi-column index. My guess is no, and the engine will treat them...

P粉002023326 2023-10-21 22:05:44

Web crawler - how to cooperate with requests in python's multi-process

This is the code for sequential execution of a single process: {code...} This is the code for multiple processes: {code...} However, there is almost no difference in the time spent by single process and multi-process. The problem is probably that requests block IO. Please understand. Is this correct...

阿神 2017-06-22 11:52:30

javascript - Is there a plug-in for multi-select drop-down grouping based on vue?

Then the UI framework I used was element-ui1.2.9 and found that it did not provide such a component. Let's see if there is such a multi-select drop-down grouping plug-in based on vue!

PHP中文网 2017-05-19 10:20:09

java - The set(int index, E element) method in ArrayList does not need to be synchronized in the case of multi-threading

I know that ArrayList is a thread-unsafe class. In multi-threaded situations, add() and remove() cannot be performed directly, but can I use the set(int index, E element) method, {code...}

为情所困 2017-05-27 17:40:40

How to handle multi-select drop-down forms for each row when implementing dynamic form saving in Laravel

In my form, I have a dynamic table with multi-select dropdowns color_id[] and size_id[] with the same name in each row. I don't know how to save multiple selected values as comma separated values in each row stored in the database. I tried saving to database here but it didn't work. HTML code: &...

P粉301523298 2023-08-31 10:43:09

java - In a simple multi-threading example, how to analyze the execution process of multiple threads based on the printed results?

A simple multi-threading example, how should I analyze the execution process of multiple threads? In this example, I want to know the execution process of these 5 threads, and then this result will appear on the console?

滿天的星座 2017-05-27 17:40:53

In a multi-user environment, how does tp5 verify whether the data has been modified by others before it is submitted and saved? Is there any built-in verification method?

In a multi-user environment, multiple users view and modify the same piece of data. How to verify that the data has not been modified by other users before the user submits and saves it? I want to add a timestamp field to the database table design to save the data modification time. time, and then p...

phpcn_u16587 2018-01-05 02:05:53

Multi-line comment problem in php

What is the shortcut key for multi-line comments? CTRL+shift+/ No, it’s not a shortcut key conflict.

P粉899023144 2022-04-17 18:28:45

python3.x - How can python3 use multiple processes to write logs to the same log more safely?

I am doing a schedule and need to use multi-threading to call up the stored procedure or SQL in the program and record the log, and record the execution information in the log. However, according to the information, logging is multi-process safe and multi-thread unsafe. I would like to ask you if th...

某草草 2017-05-27 17:39:32

javascript - webpack There was a problem when using babel to convert to es6, but webpack did not report an error! ! Urgently urgently

File structure: / 2017-04-13 webpack_Demo / {code...} json {code...} Problem description: The project is a multi-entry and multi-output application. It independently merges jquery, avalon and other plug-ins into common.js, and other Separate output, now you need babel: es6--convert to es5, but after...

怪我咯 2017-05-16 13:45:06

ESLint Vue multi-word component

Is there a way to prevent single word view names in Vue3 from getting errors from ESLint? Every time I run ESLint I get the following message: 1:1 errorComponentname "About" should always be multi-wordvue/multi-word-component-names I currently have this setup: File structure: ├──index.html...

P粉349222772 2024-03-25 17:26:59

Please tell me how to write this multi-level linkage code?

I am a novice and couldn't find the code for this kind of multi-level linkage on the Internet, so I had to come to the program for help. The program is zblog and the imperial cms page needs to have this kind of multi-level linkage from Taobao. Multi-level linkage needs to have 1, 2, and 3 in the pic...

赵泽鑫 2022-01-25 22:54:25

How to traverse multi-dimensional array in tp5.

There is an array. Array( [ids] => Array ( [0] => 1 [1] => 2

SoGun 2021-01-03 23:24:34

Whether to cd to the specified directory when composer require

For example: composer require topthink/think-multi-app Do you want to go to the topthink directory first, and then composer require

P粉433286447 2022-07-30 10:12:14

Problem with nginx reverse proxy binding independent domain name?

Scenario: A multi-user system binds an independent domain name to a user. Primary domain name: www.xxx.com/username Independent domain name: www.username.com (any) Problem: Since the multi-user system server is in China, the user's independent domain name cannot be directly resolved Come over so the...

过去多啦不再A梦 2017-05-16 17:26:37