What are the practical uses of MySQL's union query [union]?

What are the practical uses of MySQL's union query [union]? {code...}

曾经蜡笔没有小新 2017-06-10 09:49:42 0  3  1046

PHP implements replacement of placeholders in CSV files with actual values

I have a template CSV file which contains placeholders like {$NAME} now I want to replace all these placeholders with actual values. I'm using Laravel, but that doesn't matter. The current approach is as follows: $templateCSV=Storage::get('quote.intake.form.template.csv');//Read file content $vars=[...

P粉520204081 2023-09-16 11:51:32 0  1  992

After listening to a few lectures, I don't understand the practical use of VUE in the project.

I have never seen VUE in actual project practice. I have never seen VUE used in any project. What practical effect does it have? ? ? ?

拼搏奋斗 2019-08-17 21:56:04 0  1  1344

javascript - What are the practical and specific uses of JsDoc?

If you want to understand the actual phenomenon and the functions brought by JSDoc, for example, this file: https://github.com/showdownjs... The expected phenomenon is what I thought of myself: make the js interface static (actually mainly 3) to facilitate document generation It is convenient for ID...

代言 2017-07-05 10:56:16 0  1  769

django internationalization, changing .po file has no effect

I would like to ask everyone for advice. Since I have been learning Django recently and learned about the internationalization of Django, a small problem has arisen: no matter how I change the django.po file, delete it and regenerate it, restart the server, the page displayed every time is still the...

高洛峰 2017-05-18 10:58:02 0  2  702

python - scrapy crawls many more pages than actually enters items?

{Code...} Why do I visit more pages than actually enter items when I use scrapy to crawl? Is there any way to solve the problem that after crawling for a long time, there are not many pieces of data in the items?

PHP中文网 2017-05-18 10:47:40 0  1  643

javascript - Is it practical to ajax the collected access information to the server when the web page is closed? ?

I want to ajax the collected access information to the server when the web page is closed. Is it practical? ? The approximate code structure is as follows: {code...} The question is, is it practical to use window.onbeforeunload to trigger ajax? What if the user's phone is stuck or there is something...

天蓬老师 2017-05-19 10:25:34 0  1  726

php - Post upload file, content-length does not match the actual obtained size

The form uploads a file, {code...} but the body contains encoded data {code...} and the Content-Length does not match the actual body length. So if I upload a large file, such as 5M, I will The client wants to read 1M in a loop, what should we do?

天蓬老师 2017-05-18 10:45:25 0  1  807

laravel - configuration issues about Homestead

The evil Ruijie will prompt a multiple network card error when starting homestead. Under win, you can use tools such as Cheetah WiFi to solve the problem. Under mac, the old solution is no longer supported. Before using Vagrant, I only used port forwarding, so Ruijie would not detect multiple networ...

某草草 2017-05-16 16:52:45 0  1  618

How to use gulp compiled es6 files in real projects?

I am a newbie. I have seen a lot of masters using gulp to build a compilation es6 environment, and I have tried it myself, but I still don’t quite understand how to use it in actual projects. I saw an example written by a master, which is to compile multiple es6 files into The js files are finally m...

PHP中文网 2017-05-19 10:34:53 0  2  547

I have never seen VUE's project in action.

I have never seen VUE in actual project practice. I have never seen VUE used in any project. I have never seen VUE in actual project practice. I have never seen VUE used in any project. What practical effect does it have? ? ? ? I have never seen VUE in actual project practice. I have never seen VUE ...

手机用户094955811 2019-08-21 15:49:34 0  1  1415

There is a problem with the logic of the previous page in paging

After calculation, the actual value of $page is 2, and the content displayed in the actual list is also the content of the second page, but the value of Pd in ​​the url is 1. I hope the teacher can check it out, thank you!

-- 2019-05-29 21:01:55 0  0  1026

Want to know the actual usage of Math.max

Math.max(1,2,3,4,5) What I want to know is how can I get and use this (1,2,3,4,5). For example: var a = [1,2,3,4,5]var b = Math.max(a)NaN I want to use Math.max to get

小朋友 2018-05-13 18:37:36 0  1  1779

Understand the inner workings of the Nuxtjs auth module

I'm actually trying to integrate the Nuxtjsauth module into my project but I can't understand how the auth module actually works. It would be very helpful to me if someone help me understand this concept. Thanks!

P粉807471604 2024-04-06 15:38:16 0  1  478

mysql - Update problem of related data table

UPDATE a,b SET a.v_publishyear = b.v_publishyear WHERE a.v_id = b.v_e I want to update the data in table a. There should actually be more than 9,000 pieces of data, but in fact only 120 pieces of data can be updated. How is this going. Update the publishyear field in table b to the corresponding tab...

天蓬老师 2017-05-27 17:39:06 0  2  674

where is the problem? This simple html/PHP form works fine when tested locally but fails on the live server

I want to add a "Send Message" form to an existing website. I found this tutorial: PHP Contact Form I reviewed the code from the tutorial, learned how it works, and then programmed it. I got it running and tested it all on my PC and it works perfectly. I then put it on the server as part o...

P粉060528326 2023-09-05 17:03:39 0  1  520

PHP operates mongodb to query two tables

The official commands can be queried, but who knows the actual PHP operation?

Sinker 2018-07-31 15:14:20 0  1  1122

php PDO replace anonymous parameter ('?') in query with editable value

I'd like a way to show what a SQL query looks like when replacing anonymous parameters (?) with actual parameters. This is for readability purposes and debugging only and will not be used as an actual query. I found this function works in most cases: returnarray_reduce($this->bindValues,function(...

P粉654894952 2023-09-02 11:38:14 0  1  504

API encounters 400 error in 1 Kubernetes Pod and responds with "Unrecognized configuration"

I used the proxy-middleware package to rewrite the path of the actual APIURL in the Nodejs file to /api/events/restservices/api/disaster/v1/events> To hide the actual url, instead of calling the api using lgw with different environment, we Make the call using CDPGRM edge URL, like we call actual-...

P粉976488015 2024-01-10 18:22:17 0  1  576

There is a bug in the modification function

Modifying functionality is actually adding functionality. But why do I get an error when I change add to save?

Gread 2019-05-29 19:40:20 0  2  1218