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PostgreSQL return result set as JSON array?
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The json_agg function produces this result out of the box. It automatically figures out how to convert its input into JSON and aggregates it into an array.
SELECT json_agg(t) FROM t
There is no jsonb (introduced in 9.4) version of json_agg. You can either aggregate the rows into an array and...
SetUnhandledExceptionFilter and the C/C++ Runtime Library - C/C++ - 清...
...UTE_HANDLER, the Operating System will display the default crash dialog or call the Just in time (JIT) debugger if such a debugger is installed on the system.
In order to test the code, we will simulate a null pointer invalid access like this:
int main()
{
::SetUnhandledExceptionFilter(Our...
How to filter by object property in angularJS
...ou simply have to use the filter filter (see the documentation) :
<div id="totalPos">{{(tweets | filter:{polarity:'Positive'}).length}}</div>
<div id="totalNeut">{{(tweets | filter:{polarity:'Neutral'}).length}}</div>
<div id="totalNeg">{{(tweets | filter:{polarity:'Ne...
What is the “->” PHP operator called and how do you say it when reading code out loud? [closed]
What do you call this arrow looking -> operator found in PHP?
16 Answers
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What is the purpose of willSet and didSet in Swift?
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Attention: willSet and didSet are not called when you set the property from within an init method as Apple notes: willSet and didSet observers are not called when a property is first initialized. They are only called when the property’s value is set outside of ...
Calling async method synchronously
...ync().Result;
Note: In some cases, this might lead to a deadlock: Your call to Result blocks the main thread, thereby preventing the remainder of the async code to execute. You have the following options to make sure that this doesn't happen:
Add .ConfigureAwait(false) to your library method o...
How to call an async method from a getter or setter?
What'd be the most elegant way to call an async method from a getter or setter in C#?
12 Answers
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Viewing a Deleted File in Git
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git show HEAD^:path/to/file
You can use an explicit commit identifier or HEAD~n to see older versions or if there has been more than one commit since you deleted it.
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What is the difference between Class Path and Build Path
...a compiler and the Java runtime where to find compiled classes. It is typically a sequence of JAR file names and directory names. The classpath used by the compiler and the runtime system don't have to be the same, but they typically should be, especially for a small project.
Buildpath is not sta...
Print current call stack from a method in Python code
In Python, how can I print the current call stack from within a method (for debugging purposes).
7 Answers
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