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sql primary key and index
Say I have an ID row (int) in a database set as the primary key. If I query off the ID often do I also need to index it? Or does it being a primary key mean it's already indexed?
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NullPointerException accessing views in onCreate()
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The tutorial is probably outdated, attempting to create an activity-based UI instead of the fragment-based UI preferred by wizard-generated code.
The view is in the fragment layout (fragment_main.xml) and not in the activity layout (activity_main.xml). onCreate() is too early in the lifecyc...
How do I pass command line arguments to a Node.js program?
...e argument when you know its position: process.argv[n] where n is the zero-based index
– Luca Steeb
Feb 1 '15 at 15:12
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How to use the IEqualityComparer
I have some bells in my database with the same number. I want to get all of them without duplication. I created a compare class to do this work, but the execution of the function causes a big delay from the function without distinct, from 0.6 sec to 3.2 sec!
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Is null reference possible?
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Detection of dereferenced null pointers in typeid works based on syntax, instead of based on semantics. That is, if you do typeid(0, *(ostream*)0) you do have undefined behavior - no bad_typeid is guaranteed to be thrown, even though you pass an lvalue resulting from a null pointe...
jQuery or javascript to find memory usage of page
...n (not just developer tools), so that my application can determine actions based on memory usage in a user's browser.
The simple but correct answer is no. Not all browsers expose such data to you. And I think you should drop the idea simply because the complexity and inaccuracy of a "handmade" sol...
How can I get `find` to ignore .svn directories?
...ingly, because Subversion stores duplicates of each file in its .svn/text-base/ directories my simple searches end up getting lots of duplicate results. For example, I want to recursively search for uint in multiple messages.h and messages.cpp files:
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Disable time in bootstrap date time picker
...his out due to the update with DateTimePicker. You would enter in a format based off of moment.js documentation. You can use what other answers showed:
$('#datetimepicker').datetimepicker({ format: 'DD/MM/YYYY' });
Or you can use some of the localized formats moment.js provides to do just a date,...
Any reason not to start using the HTML 5 doctype? [closed]
...p representations (serialisations) of the HTML language. The former is XML-based, and the latter is a unique dialect (with special parsing semantics) of SGML.
– Delan Azabani
Aug 12 '11 at 11:39
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Do I need to store the salt with bcrypt?
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The salt is incorporated into the hash (encoded in a base64-style format).
For example, in traditional Unix passwords the salt was stored as the first two characters of the password. The remaining characters represented the hash value. The checker function knows this, and pull...