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string - Difference between text and varchar (character varying)

What's the difference between the text data type and the character varying (varchar) data types? According to the ... it as well. So what's the difference? Question&Answers:os...

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

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multithreading - Volatile vs Static in Java

Is it correct to say that static means one copy of the value for all objects and volatile means one copy of ... threads, then why should we go for volatile? Question&Answers:os...

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

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embedded - Understanding Linux /proc/pid/maps or /proc/self/maps

I am trying to understand my embedded Linux application's memory use. The /proc/pid/maps utility/file seems to be ... to be some of the larger memory segments. Question&Answers:os...

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

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c# - Setting WPF image source in code

I'm trying to set a WPF image's source in code. The image is embedded as a resource in the project. By looking at ... x:Name="_icon" Width="16" Height="16" /> Question&Answers:os...

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

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How to add a new audio (not mixing) into a video using ffmpeg?

I used a command like: ffmpeg -i video.avi -i audio.mp3 -vcodec codec -acodec codec output_video.avi -newaudio in ... audio to my video (not mix) using ffmpeg. Question&Answers:os...

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

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cmd - Is there a command to refresh environment variables from the command prompt in Windows?

If I modify or add an environment variable I have to restart the command prompt. Is there a command I could execute that would do this without restarting CMD? Question&Answers:os...

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

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c++ - How do I erase an element from std::vector<> by index?

I have a std::vector<int>, and I want to delete the n'th element. How do I do that? std::vector<int> vec; ... push_back(-17); vec.push_back(12); vec.erase(???); Question&Answers:os...

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

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get and set in TypeScript

I'm trying to create get and set method for a property: private _name: string; Name() { get: { return this._name; } ... ; } } What's the keyword to set a value? Question&Answers:os...

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

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swift - Get the length of a String

How do you get the length of a String? For example, I have a variable defined like: var test1: String = "Scott ... t seem to find a length method on the string. Question&Answers:os...

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

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c# - How can I make a .NET Windows Forms application that only runs in the System Tray?

What do I need to do to make a Windows Forms application to be able to run in the System Tray? Not an application ... a tool tip, and a "right click" menu. Question&Answers:os...

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

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html - Is there an equivalent to background-size: cover and contain for image elements?

I have a site with many pages and different background pictures, and I display them from CSS like: body.page- ... the same way that background-size: cover does? Question&Answers:os...

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

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objective c - Why is @autoreleasepool still needed with ARC?

For the most part with ARC (Automatic Reference Counting), we don't need to think about memory management at ... , as @mattjgalloway has shown in his answer. Question&Answers:os...

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

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python - Count unique values per groups with Pandas

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

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Method Syntax in Objective-C

Can someone explain this method declaration syntax for me? In this function, the number of rows of a UIPickerView ( ... count]; return[self.zips count]; } Question&Answers:os...

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

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gradle - Include .so library in apk in android studio

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

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1.7k views

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dockerfile - Add a volume to Docker, but exclude a sub-folder

Supposed I have a Docker container and a folder on my host /hostFolder. Now if I want to add this folder to the ... as well. Is this possible? If so, how? Question&Answers:os...

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

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asp.net mvc - Why does Html.ActionLink render "?Length=4"

I'm VERY confused as to why this code Html.ActionLink("About", "About", "Home", new { hidefocus = "hidefocus ... , but where does the ?Length=4 come from? Question&Answers:os...

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

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c++ - Is there a replacement for unistd.h for Windows (Visual C)?

I'm porting a relatively simple console program written for Unix to the Windows platform (Visual C++ 8.0). All the ... at work - I'm stuck with Visual Studio. Question&Answers:os...

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

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315 views

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rake - Why does Ruby 1.9.2 remove "." from LOAD_PATH, and what's the alternative?

The latest changesets to Ruby 1.9.2 no longer make the current directory . part of your LOAD_PATH. I have a non- ... way to make my Rakefiles 1.9.2+ compatible? Question&Answers:os...

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

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javascript - How to add conditional attribute in Angular 2?

How can I conditionally add an element attribute e.g. the checked of a checkbox? Previous versions of Angular ... no other way of providing this functionality. Question&Answers:os...

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

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822 views

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linux - How can I link to a specific glibc version?

When I compile something on my Ubuntu Lucid 10.04 PC it gets linked against glibc. Lucid uses 2.11 of glibc. ... try to compile a gcc cross toolchain for ARM. Question&Answers:os...

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

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213 views

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jquery - Show div on scrollDown after 800px

I want to show a hidden div when scrolling down after 800px from the top of the page. By now I have this example, ... }); Here is a Fiddle of my current code. Question&Answers:os...

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

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276 views

1 answer

sql - Convert Datetime column from UTC to local time in select statement

I'm doing a few SQL select queries and would like to convert my UTC datetime column into local time to ... manual and random SQL queries against my databases. Question&Answers:os...

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

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r - Combine Multiple Columns Into Tidy Data

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

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198 views

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Sass - Manipulate inherited property?

Is it possible, in Sass, to manipulate a value a given element already inherits? I am aiming for something like ... color: red strong color: darken(inherit,20) Question&Answers:os...

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

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137 views

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c++ - Why does a large local array crash my program, but a global one doesn't?

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

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223 views

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javascript - How can I display a modal dialog in Redux that performs asynchronous actions?

I'm building an app that needs to show a confirm dialog in some situations. Let's say I want to remove ... action that starts the flow in the left side. Question&Answers:os...

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

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123 views

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REST API Best practice: How to accept list of parameter values as input

Closed. This question is opinion-based. It is not currently accepting answers. Question&Answers:os...

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

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