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How do MySQL indexes work?
I am really interested in how MySQL indexes work, more specifically, how can they return the data requested without scanning the entire table?
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Android Webview - Webpage should fit the device screen
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You have to calculate the scale that you need to use manually, rather than setting to 30.
private int getScale(){
Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int width = display.getWidth();
Double val = new Double...
How to programmatically clear application data
...st). In order to do so, I need to clear the app data. This can be done manually in Settings/Applications/Manage Applications/[My App]/Clear data
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Android: How can I get the current foreground activity (from a service)?
...atePendingResult()) that the service invokes
Have the activity register a callback or listener object with the service via bindService(), and have the service call an event method on that callback/listener object
Send an ordered broadcast Intent to the activity, with a low-priority BroadcastReceiver...
error: command 'gcc' failed with exit status 1 while installing eventlet
I wanted to install eventlet on my system in order to have "Herd" for software deployment.. but the terminal is showing a gcc error:
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Get index of selected option with jQuery
... seem to work in the browsers that I tested, but the option tags doesn't really correspond to actual elements in all browsers, so the result may vary.
Just use the selectedIndex property of the DOM element:
alert($("#dropDownMenuKategorie")[0].selectedIndex);
Update:
Since version 1.6 jQuery ha...
Arrays vs Vectors: Introductory Similarities and Differences [closed]
...ze; you can't resize an array in C++ (unless it's an array of POD and it's allocated with malloc);
their size must be a compile-time constant unless they are allocated dynamically;
they take their storage space depending from the scope where you declare them;
if dynamically allocated, you must expli...
What is reflection and why is it useful?
... say you have an object of an unknown type in Java, and you would like to call a 'doSomething' method on it if one exists. Java's static typing system isn't really designed to support this unless the object conforms to a known interface, but using reflection, your code can look at the object and fin...
Why does isNaN(“ ”) (string with spaces) equal false?
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You should try NaN===NaN or NaN==NaN;-) I don't know if all this means the javascript engine is wacky or that javascript is bad for wacky programmers though.
– KooiInc
May 5 '09 at 22:01
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How much size “Null” value takes in SQL Server
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The smallest addressable unit of memory in most computer systems is one byte (typically 8 bits). So in reality, a bit takes a byte. Great answer Mark: +1.
– JohnB
Sep 16 '10 at 22:23
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