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Right query to get the current number of connections in a PostgreSQL DB
...alent. The equivalent version of the first one would be:
SELECT sum(numbackends) FROM pg_stat_database;
In that case, I would expect that version to be slightly faster than the second one, simply because it has fewer rows to count. But you are not likely going to be able to measure a difference.
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How do I redirect in expressjs while passing some context?
I am using express to make a web app in node.js. This is a simplification of what I have:
8 Answers
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Static way to get 'Context' in Android?
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Peter Mortensen
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answered Feb 25 '11 at 6:37
Rohit GhatolRohit...
Test for non-zero length string in Bash: [ -n “$var” ] or [ “$var” ]
...t: This is a more complete version that shows more differences between [ (aka test) and [[.
The following table shows that whether a variable is quoted or not, whether you use single or double brackets and whether the variable contains only a space are the things that affect whether using a test wi...
How to jump back to NERDTree from file in tab?
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If you use T instead of t there is no need to jump back because the new tab will be opened, but vim's focus will simply remain within NERDTree.
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Unable to copy file - access to the path is denied
I am using Visual Studio 2005. After taking code from version control first,
the c#.net application runs correctly. But, after doing some modifications, when I build I am getting the following error:
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How to install multiple python packages at once using pip
I know it's an easy way of doing it but i didn't find it neither here nor on google.
So i was curious if there is a way to install multiple packages using pip.
Something like:
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using lodash .groupBy. how to add your own keys for grouped output?
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You can do it like this in Lodash 4.x
var data = [{
"name": "jim",
"color": "blue",
"age": "22"
}, {
"name": "Sam",
"color": "blue",
"age": "33"
}, {
"name": "eddie",
"color": "green",
"age": "77"
}];
co...
How do I make a delay in Java?
...her, sleep isn't very flexible when it comes to control.
For running a task every second or at a one second delay I would strongly recommend a ScheduledExecutorService and either scheduleAtFixedRate or scheduleWithFixedDelay.
For example, to run the method myTask every second (Java 8):
public sta...
Should I put #! (shebang) in Python scripts, and what form should it take?
...hebang line in any script determines the script's ability to be executed like a standalone executable without typing python beforehand in the terminal or when double clicking it in a file manager (when configured properly). It isn't necessary but generally put there so when someone sees the file ope...