OStack Q&A-Knowledge Sharing Community

0 votes

463 views

1 answer

MySQL, Check if a column exists in a table with SQL

I am trying to write a query that will check if a specific table in MySQL has a specific column, and if not -? ... work, but it fails badly. Is there a way? Question&Answers:os...

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

0 votes

293 views

1 answer

shell - Identifying and removing null characters in UNIX

I have a text file containing unwanted null characters (ASCII NUL, ). When I try to view it in vi I see ^@ ... I'm just wondering if this is the best way? Question&Answers:os...

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

0 votes

417 views

1 answer

r - Combining paste() and expression() functions in plot labels

Consider this simple example: labNames <- c('xLab','yLabl') plot(c(1:10),xlab=expression(paste( ... joined to the superscripted expression. Any thoughts? Question&Answers:os...

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

0 votes

223 views

1 answer

Custom Facebook Login Button - Android

I''m following this Tutorial but so far I can't make it work, though this is from a year ago or so ... maybe there is something more updated? Thanks in advance! Question&Answers:os...

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

0 votes

459 views

1 answer

c# - Is using a Mutex to prevent multiple instances of the same program from running safe?

I'm using this code to prevent a second instance of my program from running at the same time, is it safe? Mutex ... the Mutex will still be held. Is that true? Question&Answers:os...

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

0 votes

194 views

1 answer

c++ - Is calling destructor manually always a sign of bad design?

I was thinking: they say if you're calling destructor manually - you're doing something wrong. But is it ... it is hard/impossible/impractical to avoid it? Question&Answers:os...

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

0 votes

99 views

1 answer

c++ - How to Compile for OS X in Linux or Windows?

I would like to port my C/C++ apps to OS X. I don't have a Mac, but I have Linux and Windows. Is there any tool for this? Question&Answers:os...

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

0 votes

1.2k views

1 answer

java - JAXB: How to ignore namespace during unmarshalling XML document?

My schema specifies a namespace, but the documents don't. What's the simplest way to ignore namespace during JAXB ... tempuri.org/"><bar></bar></foo> Question&Answers:os...

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

0 votes

541 views

1 answer

stdout - C++ alignment when printing cout <<

Is there a way to align text when printing using std::cout? I'm using tabs, but when the words are too big they won' ... Shut 8.49 Classical 8% 7.81 0.72 8.49 Question&Answers:os...

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

0 votes

206 views

1 answer

c# - How do I sort strings alphabetically while accounting for value when a string is numeric?

I'm trying to sort an array of numbers that are strings and I'd like them to sort numerically. The catch is that ... and by number: 007, 90, bob, lauren, paul Question&Answers:os...

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

0 votes

162 views

1 answer

Can I use library that used android support with Androidx projects.

I know, androidx and support dependency causing multidex error We can not use androidx and android support at ... "com.airbnb.android:lottie:$lottieVersion" } Question&Answers:os...

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

0 votes

442 views

1 answer

Can we import XML file into another XML file?

Can we import an XML file into another XML file? I mean is there any import tag in XML that takes XML path ... and imports XML (for which path is provided). Question&Answers:os...

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

0 votes

117 views

1 answer

java - How can I create table using ASCII in a console?

I would like to organize information like this: The information is organized with cells, whereas with System ... the information would be very disorganized. Question&Answers:os...

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

0 votes

194 views

1 answer

performance - Faster way to find the first empty row in a Google Sheet column

I've made a script that every few hours adds a new row to a Google Apps spreadsheet. This is the function I've ... in timeout or worse. Is there a better way? Question&Answers:os...

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

0 votes

366 views

1 answer

Javascript : Send JSON Object with Ajax?

Is this possible? xmlHttp.send({ "test" : "1", "test2" : "2", }); Maybe with: a header with content type : ... be cool to send it in this way if it's possible. Question&Answers:os...

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

0 votes

487 views

1 answer

apache spark - DataFrame join optimization - Broadcast Hash Join

I am trying to effectively join two DataFrames, one of which is large and the second is a bit smaller. Is ... a way to force broadcast ignoring this variable? Question&Answers:os...

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

0 votes

96 views

1 answer

AngularJS - pass function to directive

I have a example angularJS <div ng-controller="testCtrl"> <test color1="color1" updateFn="updateFn()"></test> ... appear, but nothing show. Can anyone help me? Question&Answers:os...

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

0 votes

190 views

1 answer

java - Lambda expression vs method reference

IntelliJ keeps proposing me to replace my lambda expressions with method references. Is there any objective difference between both of them? Question&Answers:os...

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

0 votes

98 views

1 answer

ios - How to encode a URL in Swift

This question already has answers here: Question&Answers:os...

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

0 votes

394 views

1 answer

sorting - How to sort alpha numeric set in python

I have a set set(['booklet', '4 sheets', '48 sheets', '12 sheets']) After sorting I want it to look like 4 sheets, 12 sheets, 48 sheets, booklet Any idea please Question&Answers:os...

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

0 votes

247 views

1 answer

c++ - Why can't I have a non-integral static const member in a class?

I noticed C++ will not compile the following: class No_Good { static double const d = 1.0; }; However ... members can be initialized inside a class or struct Question&Answers:os...

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

0 votes

141 views

1 answer

javascript - Changing the selected option of an HTML Select element

In my HTML, I have a <select> with three <option> elements. I want to use jQuery to check each option's ... attribute of that option. How would I do that? Question&Answers:os...

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

0 votes

96 views

1 answer

java - How can I get an HTTP response body as a string?

I know there used to be a way to get it with Apache Commons as documented here: http://hc.apache.org/httpclient ... response body as a string and not a stream? Question&Answers:os...

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

0 votes

458 views

1 answer

ios - Print: Entry, ":CFBundleIdentifier", Does Not Exist

When I run react-native run-ios the build succeeds but I get the error below. I've checked all over the ... /lib/node_modules/react-native-cli/index.js:88:7) Question&Answers:os...

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

0 votes

117 views

1 answer

java - How to start two threads at "exactly" the same time

The threads should start at same split second. I understand, if you do thread1.start(), it will take some ... .start(). Is it even possible or impossible? Question&Answers:os...

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

0 votes

531 views

1 answer

macos - XAMPP permissions on Mac OS X?

I installed XAMPP 1.7.3 on Mac OS X 10.6.8 without changing any defaults. The webserver seems to work ... ? Running NetBeans as root seems a bit extreme. Question&Answers:os...

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

0 votes

429 views

1 answer

python - How does perspective transformation work in PIL?

PIL's Image.transform has a perspective-mode which requires an 8-tuple of data but I can't figure out how to ... degrees to that tuple. Can anyone explain it? Question&Answers:os...

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

0 votes

156 views

1 answer

php - How to find out where a function is defined?

How can I find out in which file and line a given function was defined? Question&Answers:os...

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

Categories

Recent questions

Just Browsing Browsing

Most popular tags