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How to find duplicates in 2 columns not 1
I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they should never have a duplicate of BOTH of them having the same value.
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Passing multiple error classes to ruby's rescue clause in a DRY fashion
I have some code that needs to rescue multiple types of exceptions in ruby:
3 Answers
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Check if array is empty or null
I would like to know how to check if an array is empty or null in jQuery. I tried array.length === 0 but it didn't work. It did not throw any error either.
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Import module from subfolder
I want to import subfolders as modules. Therefore every subfolder contains a __init__.py . My folder structure is like this:
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from jquery $.ajax to angular $http
...gularJS way of calling $http would look like:
$http({
url: "http://example.appspot.com/rest/app",
method: "POST",
data: {"foo":"bar"}
}).then(function successCallback(response) {
// this callback will be called asynchronously
// when the response is available
$sc...
Mongoose indexing in production code
Per the Mongoose documentation for MongooseJS and MongoDB / Node.js :
3 Answers
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How to handle multiple heterogeneous inputs with Logstash?
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Should I run as many instances as I have different types of logs?
No! You can only run one instance to handle different types of logs.
In the logstash configuration file, you can specific each input with different type.
Then in the filte...
How do I open links in Visual Studio in my web browser and not in Visual Studio?
If there is a URL in a source file comment, I can "CTRL + click to follow link." However, when I do this, the link opens inside Visual Studio. How can I make it open in my web browser--in my case, Google Chrome?
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Do c++11 lambdas capture variables they don't use?
...icate that I would like all local variables to be captured by value in a lambda, will that result in all local variables in the function being copied, or just all local variables that are used by the lambda ?
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What is std::string::c_str() lifetime?
In one of my programs, I have to interface with some legacy code that works with const char* .
7 Answers
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