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Aggregate function in MySQL - list (like LISTAGG in Oracle)

I need function, that returns list of strings. I have data in table like this: Id MyString -------------- ... -- First, Second, Third Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - What is the JSON.NET equivalent of XML's XPath, SelectNodes, SelectSingleNode?

At present, the structure of my code uses XmlDocument to load Xml data and then SelectNodes to iterate through a ... as it's C# integrable. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to know if a pointer points to the heap or the stack?

Example: bool isHeapPtr(void* ptr) { //... } int iStack = 35; int *ptrStack = &iStack; bool ... 'm going to avoid rubbish programming See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to use argv with Spyder

I'm running the code below in Spyder. I have typed it in a py file and simply hit the run button. When I ... "Your third variable is:", third See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Service worker registration failed. Chrome extension

I don't understand how to migrate from manifest v2 to v3 in part of Service Worker. Occurs ... runtime.onInstalled.addListener(onInstalled); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - file_get_contents receive cookies

Is it possible to receive the cookies set by the remote server when doing a file_get_contents request? I need ... using the stored cookies. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Is there any way in C# to override a class method with an extension method?

There have been occasions where I would want to override a method in a class with an extension method. Is there ... in a lot of cases. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Javascript equivalent of PHP's list()

Really like that function. $matches = array('12', 'watt'); list($value, $unit) = $matches; Is there a Javascript equivalent of that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Serialize a container of enums as strings using JSON.net

You can serialize an enum field in an WebAPI model as a string by adding an attribute: enum Size { Small, Medium, ... [ "Medium", "Large" ] } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Django/Python Beginner: Error when executing python manage.py syncdb - psycopg2 not found

I have Pythong2.6, psycopg2 and pgAdmin3 installed using Macports. My settings.py is: DATABASE_ENGINE = ' ... appreciated. Thanks, Wenbert! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Android coding with switch (String)

I'm developing an android app on eclipse, when I try some code like switch(String){ ...... } it give me the following ... else if(){} ........ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How deterministic is floating point inaccuracy?

I understand that floating point calculations have accuracy issues and there are plenty of questions explaining why. ... and see what happens. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JavaFX: "Toolkit" not initialized when trying to play an mp3 file through MediaPlayer class

I'm trying to make a simple mp3 play in the background of my program using the following: Media med = new ... per the cause of the problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Automatically implement traits of enclosed type for Rust newtypes (tuple structs with one field)

In Rust, tuple structs with only one field can be created like the following: struct Centimeters(i32); I want to do ... assert_eq!(a + a, b); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to overcome an HTMLUnit ScriptException?

I got a problem with a line of code that probably triggers some js function e couse an exception, how can i fix ... force it with a dbclick(). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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131 views

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c++ - How to write `is_complete` template?

After answering this question I was trying to find is_complete template in Boost library and I realized that there is ... which works for me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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hibernate - Does the JPA specification allow references to non-primary key columns?

Does the JPA specification allow simple references to non-primary key columns? I have a simple alternative/ ... a common scenario allowed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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268 views

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javascript - Slowdown due to non-parallel awaiting of promises in async generators

I'm writing code using generators and Bluebird and I have the following: var async = Promise.coroutine; function ... 1800ms which is a lot. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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328 views

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c# - Converting newtonsoft code to System.Text.Json in .net core 3. what's equivalent of JObject.Parse and JsonProperty

I am converting my newtonsoft implementation to new JSON library in .net core 3.0. I have the following ... the equivalent of Formating.None. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cordova - Override Android Backbutton behavior only works on the first page with PhoneGap

I am using PhoneGap 1.5.0, jQuery 1.7.1 and jQuery mobile 1.0.1 and trying to override the backbutton ... it work properly? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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663 views

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transparency - artifacts when rendering both sides of a transparent object with three.js

I try to render both sides of a transparent object with three.js. Other objects located within the transparent ... . Any help appreciated! Alex See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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581 views

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xampp - PHP script not working in HTML file

I'm new to PHP. I installed XAMPP and have Apache running. I created helloworld.php in XAMPP's htdocs and got PHP to ... "; ?> </body> </html> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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482 views

1 answer

python - Django Unique Together (with foreign keys)

I have a situation where I want to use the Meta options of unique_together to enforce a certain rule, ... models.ForeignKey(Client) Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - Is <div> inside <label> block correct?

I am using Bootstrap, it's demo of horizontal form: <form class="form-horizontal" role="form"> <div ... into display:inline element (label) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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494 views

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reactjs - How do I convert a string to jsx?

How would I take a string, and convert it to jsx? For example, if I bring in a string from a textarea, how ... on the client? Is it possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

1 answer

javascript - Thickness of lines using THREE.LineBasicMaterial

I am using the code below to create hundreds of lines in my three.js scene edgeGeometry[i] = new THREE. ... lines? Any ideas? Thanks, Dimitris See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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343 views

1 answer

java - How to find out if "debug mode" is enabled

How can a Java program find out if it is running in debug mode? The application should behave a bit ... to solve my original question. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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681 views

1 answer

wpf - inherit style from default style

In my project there is a custom style for text box. It is defined as: <Style TargetType="TextBox"/> So ... style should use the default style? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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