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Am I able to use the mysql built-in function get_lock?

There is a batch job out there. And there are multiple servers that can handle the job. I only want the job to be picked up and processed by one of the many servers during a specific time. In order to achieve this purpose, when investigating the global lock mechanism, I discovered the get_lock funct...

P粉875565683 2023-09-15 21:20:11

javascript - Ask a question about WeChat built-in page sharing

http://ww4.sinaimg.cn/large/a... Please click on the picture and take a look at it yourself (the company network is too difficult...) Question: I would like to ask if there is any way to avoid calling WeChat jssdk The introduction of the red piece has been changed. The picture was shared by WeChat’s...

PHP中文网 2017-05-19 10:12:40

The built-in reference type of C# video tutorial cannot be viewed

The built-in reference type of C# video tutorial cannot be viewed

柏里晗 2018-05-13 21:29:44

phpstudy linux version How to open and query the built-in mysql running log?

phpstudy linux version How to open and query the built-in mysql running log? phpstudy linux version How to open and query the built-in mysql running log? phpstudy linux version How to open and query the built-in mysql running log? phpstudy linux version How to open and query the built-in mysql runni...

Ivan 2018-12-01 08:54:56

Why can't WeChat's built-in browser use $_COOKIE to get the value?

Mobile browsers work, but the built-in QQ and WeChat browsers can’t get the COOKIE data? What is the situation? ? Do I need to use other commands for QQ and WeChat cookies? ? ?

LLX 2020-08-08 13:34:42

Which built-in file is getExtention() in? Why can't I use it?

Which built-in file is getExtention() in? Why can’t I use it? initial;">hash_file(): Unknown hashing algorithm: getExtention Unknown hashing algorithm

whxn 2020-01-03 10:53:47

android - When the network loading data is filled into the control, the size of the control is the default size, and it will change to the size I set only after I click it.

After loading the network data, use the handler to pass the data to the main thread, and then populate the control. But when the data is loaded for the first time, the size of the control that loads the data is not set by me. It seems to be the default size. Only when I click once will the control b...

某草草 2017-05-16 13:31:14

js gives all combinations

How to find out how many combinations there are? Do you have any good ideas for using js?

过去多啦不再A梦 2017-05-19 10:15:45

Restriction Java Spring Boot only accepts unique month-year combinations

How to allow input of only month-year combinations in JavaSpringBoot. I need to ensure that the user (Postman client) can enter a record (randomly generated value) for each month of the current year. For example: Month: February->Year: 2020->generatedValue=random. When the user enters February...

P粉676588738 2023-09-03 10:11:31

How the "Use Client" directive works in Next.js 13

I'm trying to learn about server side rendering using Next.js13.4 and the new app/ directory. As far as I understand, by default every component is a server component (i.e. rendered server side). However, we can use the 'useclient' directive to force the component to become a client component. Below...

P粉044526217 2023-08-26 21:55:31

The rewrite mode of the php toolbox fails under the combination of php7+apache

The rewrite mode of the php toolbox fails in the combination of php7+apache, and index.php (entry file) must be added for correct access. What's going on?

冷笑浅兮 2017-10-22 02:58:49

javascript - QQ browser and uc browser do not support css3 animation, but the built-in browsers of qq and WeChat support it

A very simple effect, the drop-down list arrow rotates. The code has no problem opening in the built-in browsers of QQ and WeChat, and the native browser of the mobile phone (Xiaomi 5splus) has no problem, but the QQ browser and UC will not open.

ringa_lee 2017-06-12 09:32:38

python - all possible permutations and combinations problem

For the time being, it can be understood as all the combination methods of letters in a string, as follows, a violent and ugly exhaustive method. . . I would like to ask if there is any better method. I have tried several methods in itertools, but none of them meet what I want. Thank you! {code...}

漂亮男人 2017-05-18 10:49:14

I don't understand how the menu page is sent to an iframe.

I don’t understand the format and method of setting the height. I don’t understand how the menu page is sent to an iframe.

梦神 2018-12-13 23:53:59

How nginx speeds up foreign websites

I recently considered starting my own business. When building a website, due to the special domestic conditions, I decided to put the website abroad. However, the latency of foreign hosts is relatively high and not very stable. After consulting domestic cloud hosts, I learned that as long as the clo...

漂亮男人 2017-05-16 17:26:35

gvim - Where can I find out which shortcut key combinations in vim are used by default and which ones are not used yet?

Where can I find out which shortcut key combinations in vim are used by default and which ones are not used yet? I wish there was a complete list, but I looked in the official manual and couldn't find it. It is best to use the gVim version under Windows environment. Thanks!

过去多啦不再A梦 2017-05-16 16:36:32

php - How to design a database similar to the top three levels of navigation on Apple's official website?

Mac/iPad/iPhone...First-level navigation iPad Pro/ipad/iOS 10...Second-level navigation Overview/Technical specifications/Buy button...Third-level navigation How should the database be designed? How are the PHP code layers assembled?

習慣沉默 2017-05-27 17:39:14

Cache - What is the significance of the serial number added before the name of the redis key set with django cache?

When using the module that comes with Django to handle the redis cache, the set key is, for example, "banners". When you see the name in the redis cli, it becomes ":1:banners". Is this the mechanism of Django or redis? The {code...}

给我你的怀抱 2017-06-10 09:48:11

Title rewritten to: Error: Invalid element type: Expected string (for built-in components) or class/function (for composite components) but got undefined element type

How can I solve this problem in my ReactNative code? The error reads "Error: Invalid element type: expected string (for built-in components) or class/function (for composite components), but got undefined. You may have forgotten to export the component from the file in which it was defined, or ...

P粉701491897 2023-09-01 13:23:24

javascript - js mechanism problem, should we wait for the main thread to finish executing before executing asynchronously? If the main thread has tens of thousands of lines, or is it context-related?

1. Like the question, I want to ask a question about the js mechanism. Is it necessary to wait for the main thread to finish executing before executing asynchronous operations? 2. Detailed explanation of JavaScript running mechanism: Let’s talk about Event Loop again. Most people have read this arti...

为情所困 2017-07-05 11:07:37