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sql - Mysql Convert Column to row (Pivot table )

I have a table like this +---+-----+----+----+----+----+ |id |month|col1|col2|col3|col4| +---+----- ... ----+---+---+ Can anyone help with 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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http - Python 'requests' library - define specific DNS?

In my project I'm handling all HTTP requests with python requests library. Now, I need to query the http ... -dns-server-for-urllib-requests See Question&Answers more detail:os...

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

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.net - How do I implement a progress bar in C#?

How do I implement a progress bar and backgroundworker for database calls in C#? I do have some methods that ... m looking for better examples. 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 - Spring Boot with AngularJS html5Mode

I start my web application with spring boot. It use a simple main class to start an embedded tomcat server: ... and I get a 404 error 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 - Min/Max of dates in an array?

How can I find out the min and the max date from an array of dates? Currently, I am creating an array like this: ... or am I to write my own? See Question&Answers more detail:os...

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

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JSON integers: limit on size

Is it specified anywhere how big JSON integers can be? I'm guessing that they're limited to normal (32 bit) ... so as not to risk overflow. 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 - Plotting grouped data in same plot using Pandas

In Pandas, I am doing: bp = p_df.groupby('class').plot(kind='kde') p_df is a dataframe object. However, ... with both classes in the same plot? 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 casting and using "as" in C#?

If there is a difference, what is the difference between the two ways of doing the following cast? In this case ... ) as GridView; //second way 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 - checkSelfPermission method is not working in targetSdkVersion 22

CheckSelfPermission method is not working as expected and it is always returning zero in android 6.0(Marshmallow). ... grantResults); } }" See Question&Answers more detail:os...

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

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remove duplicate from string in PHP

I am looking for the fastest way to remove duplicate values in a string separated by commas. So my string looks ... did it using this function? 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 - Is it possible to get the HTML code from WebView

I would like to preemptively get the HTML code of a webpage that is to be loaded in a webView, parse it ... (); The interface is never called See Question&Answers more detail:os...

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

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objective c - Modify NSEvent to send a different key than the one that was pressed

I'm trying to create an OS X keyboard hook for assistive technology purposes (i.e. don't worry, not a ... send a different character. 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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android - How to change textcolor in AlertDialog

How to change the textcolor in an AlertDialog? <item name="android:textColor">@color/black_text</item> This changes the ... }); Alerd Dialog v2 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 - Webview's Html button click detection in Activity(java code)

I was trying to detect the html button click of webview into java code(In activity) . I referred another ... called. Please correct the error. 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 - Prevent flex items from stretching

Sample: div { display: flex; height: 200px; background: tan; } span { background: red; } <div> <span>This is some text.</span> </div> 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 - Pandas Left Outer Join results in table larger than left table

From what I understand about a left outer join, the resulting table should never have more rows than the left ... . What am I misunderstanding? See Question&Answers more detail:os...

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

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css - Should border-radius clip the content?

Shouldn't the content of my container be cut off when the container has border-radius? Sample HTML and CSS: . ... buffer"></div> </div> See Question&Answers more detail:os...

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

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reactjs - React - expressions must have one parent element?

I'm relatively new to React and I'm wondering what's the standard here. Imagine I have a react-router ... preferred React way of handling 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++ - Vectors in Arduino

I am making a vector of "waypoints" on the Arduino. Each waypoint is an object. The Arduino will obviously need to ... a better path to go down? See Question&Answers more detail:os...

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

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objective c - Parsing JSON dates on IPhone

Forgive me as I'm new to Objective C. I am getting back dates from a .NET webservice in the /Date( ... handle JSON dates. 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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dart - How to take a screenshot of the current widget - Flutter

I need to take a screenshot of the current screen or widget and I need to write it into a file. 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 - Changing whisker definition in geom_boxplot

I'm trying to use ggplot2 / geom_boxplot to produce a boxplot where the whiskers are defined as the 5 and ... of the variables being drawn. 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 : Fill Spinner From Java Code Programmatically

How do you fill a spinner from java code programmatically? I have a spinner in the layout like this: <Spinner ... adapter and add the items. 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 - session.connection() deprecated on Hibernate?

We need to be able to get the associated java.sql.Connection of a hibernate session. No other connection will work, ... I supposed 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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visual studio 2010 - VS2010 command prompt gives error: Cannot determine the location of the VS Common Tools folder

I have installed VS2010. The installation creates the shortcut for VS2010 command prompt but when I open up the command ... HKLM > nul 2>&1 See Question&Answers more detail:os...

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

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Mongoose: how to define a combination of fields to be unique?

If I had a schema like this: var person = new Schema({ firstName: String, lastName: String, }); I'd ... lastName. How can I accomplish 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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java - Tomcat 8 is not able to handle get request with '|' in query parameters?

I am using Tomcat 8. In one case I need to handle external request coming from external source where the request ... but not with Tomcat 8.5 See Question&Answers more detail:os...

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

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MongoDB - how to query for a nested item inside a collection?

I have some data that looks like this: [ { "_id" : ObjectId("4e2f2af16f1e7e4c2000000a"), "advertisers" : [ { " ... fields I want to get? 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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