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iphone - Core Data's NSPrivateQueueConcurrencyType and sharing objects between threads

iOS 5 introduced a new way to quickly fetch data on a background thread by initializing the MOC using ... IDs to do 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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Echo equivalent in PowerShell for script testing

I would like to output variables and values out in a PowerShell script by setting up flags and seeing ... "filesizecounter: " . $filesizecounter See Question&Answers more detail:os...

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

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Does MySQL foreign_key_checks affect the entire database?

When I execute this command in MySQL: SET FOREIGN_KEY_CHECKS=0; Does it affect the whole engine or it is only my current transaction? See Question&Answers more detail:os...

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

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r - Select first element of nested list

Let's say I have a list like this: x = list(list(1,2), list(3,4), list(5,6)) I would like a list ... [[1]]) Is there shortcut notation for this? 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 difference between static const and const?

What is the difference between static const and const? For example: static const int a=5; const int i=5; Is ... you use one over the other? See Question&Answers more detail:os...

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

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sql order by - SQL for ordering by number - 1,2,3,4 etc instead of 1,10,11,12

I'm attempting to order by a number column in my database which has values 1-999 When I use ORDER_BY registration_no ASC I ... 1,2,3,4,5,6 etc See Question&Answers more detail:os...

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

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continuous integration - Using secret api keys on travis-ci

I'd like to use travis-ci for one of my projects. The project is an API wrapper, so many of the tests rely ... way to use those keys on Travis? See Question&Answers more detail:os...

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

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asp.net mvc - MVC 3 file upload and model binding

I have a form upload that works but I would like to pass model information for my database to save the file with a ... , how would I do this ? See Question&Answers more detail:os...

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

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coding style - What are the benefits to using anonymous functions instead of named functions for callbacks and parameters in JavaScript event code?

I'm new-ish to JavaScript. I understand many of the concepts of the language, I've been reading up on ... practice so commonplace for a reason? 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 Enums and Switch Statements - the default case?

For people suggesting throwing an exception: Throwing an exception doesn't give me a compile-time error, it gives me ... the top of the method. See Question&Answers more detail:os...

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

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macos - Sending commands and strings to Terminal.app with Applescript

I want to do something like this: tell application "Terminal" activate do script "ssh [email protected]" -- // write ... and doesn't seem to work. See Question&Answers more detail:os...

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

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controller - Angularjs: a Service that serves multiple $resource urls / data sources?

I have an Angular service/provider that serves json data to my controller which works great: angular.module('myApp ... files to my controller? See Question&Answers more detail:os...

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

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What is the difference between Asynchronous calls and Callbacks

I'm bit confused to understand the difference between Asynchronous calls and Callbacks. I read this posts which ... with plain simple English? See Question&Answers more detail:os...

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

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android - What are the semantics of withValueBackReference?

I cannot figure out the exact semantics of withValueBackReference. I've read the example code (for example ... in withValues(ContentValues) See Question&Answers more detail:os...

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

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deployment - How do I set up linkage between Docker containers so that restarting won't break it?

I have a few Docker containers running like: Nginx Web app 1 Web app 2 PostgreSQL Since Nginx needs to ... for real-life server operation. See Question&Answers more detail:os...

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

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xml - How to create a floating action button (FAB) in android, using AppCompat v21?

I would like to create a floating action button (to add items to a listview), like google calendar, maintaining ... elevation, but does not work 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# - Entity vs Model vs View Model

I just spent some time reading about this terms (I don't use them that much since we don't have any ... thanks and a nice weekend Matthias See Question&Answers more detail:os...

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

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How can I make sense of the `else` clause of Python loops?

Many Python programmers are probably unaware that the syntax of while loops and for loops includes an optional ... to this question somewhere. See Question&Answers more detail:os...

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

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720 views

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Zoom to fit all markers in Mapbox or Leaflet

How do I set view to see all markers on map in Mapbox or Leaflet? Like Google Maps API does with bounds? ... ]); } map.fitBounds(latlngbounds); 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 - What is dtype('O'), in pandas?

I have a dataframe in pandas and I'm trying to figure out what the types of its values are. I am unsure what ... ('O') What does this mean? See Question&Answers more detail:os...

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

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amazon web services - Query EC2 tags from within instance

Amazon recently added the wonderful feature of tagging EC2 instances with key-value pairs to make management of large ... to query the tags? 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++ - Do ALL virtual functions need to be implemented in derived classes?

This may seem like a simple question, but I can't find the answer anywhere else. Suppose I have the following ... that are pure virtual? 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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indexing - MySQL 5.0 indexes - Unique vs Non Unique

What is the difference between MySQL unique and non-unique index in terms of performance? Let us say I want ... primary key and unique index? See Question&Answers more detail:os...

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

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xml - How can I get started making a C# RSS Reader?

I have been wanting to make a RSS reader for a while now (just for fun), but I don't have the slightest ... reader, that would be too easy). See Question&Answers more detail:os...

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

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Set up Apache virtualhost on Windows

How can I set up virtualhost for multiple domain name on Windows? I will use it for my own test projects. ... the vhost configuration for 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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608 views

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svn - Insert Subversion revision number in Xcode

I would like to insert the current Subversion revision number (as reported by svnversion) into my Xcode project. I ... , without too much magic. See Question&Answers more detail:os...

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

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628 views

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xml - Matching a node based on a sibling's value with XPath

Having a XML document like this: <?xml version="1.0" encoding="UTF-8"?> <records type="array"> <record> ... record/record-type with the value A? See Question&Answers more detail:os...

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

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validation - maxlength attribute of a text box from the DataAnnotations StringLength in Asp.Net MVC

I am working on an MVC2 application and want to set the maxlength attributes of the text inputs. I have already ... there any way to do this? See Question&Answers more detail:os...

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

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