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Multiple INSERT statements vs. single INSERT with multiple VALUES
... adjusting the number of VALUES clauses and recording the compile time.
I then divided the compile time by the number of rows to get the average compile time per clause. The results are below
Up until 250 VALUES clauses present the compile time / number of clauses has a slight upward trend but n...
Passing Data between View Controllers
...to tell it about ViewControllerB so use an
#import "ViewControllerB.h"
Then where you want to load the view eg. didSelectRowAtIndex or some IBAction you need to set the property in ViewControllerB before you push it onto nav stack.
ViewControllerB *viewControllerB = [[ViewControllerB alloc] ini...
Rails: How to get the model class name based on the controller class name?
...
If your controller and model are in the same namespace, then what you want is
controller_path.classify
controller_path gives you the namespace; controller_name doesn't.
For example, if your controller is
Admin::RolesController
then:
controller_path.classify # "Admin::Role"...
printf with std::string?
...ntially the only way to work around it is to do the formatting separately, then pass the result as a string to printf, because printf itself simply will not do the job correctly.
Although they're quite compact, printf format strings can be quite unreadable. Even among C programmers who use printf vi...
How do I revert master branch to a tag in git?
... --hard HEAD^ can be used multiple times to step back one commit at a time then if it is on remote, git push --force origin master can be used.
– Luke Wenke
Jul 27 '15 at 8:19
...
Best Practices: Salting & peppering passwords?
...sh functions more secure. I mean, if the attacker only gets your database, then your users passwords should be secure, right? Seems logical, right?
That's why so many people believe that peppers are a good idea. It "makes sense".
The Reality Of Peppers
In the security and cryptography realms, "m...
Get the first item from an iterable that matches a condition
...versions 2.5 and older -- without mentioning the Python-version issue (but then I don't see that mention in the answers that do mention the next built-in, which is why I thought it necessary to provide an answer myself -- at least the "correct version" issue gets on record this way;-).
In 2.5, the ...
How do I tell Maven to use the latest version of a dependency?
...is I use the versions plugin and scm plugin to update the dependencies and then check it in to source control. Yes I let my CI do SCM checkins (which you have to do anyway for the maven release plugin).
You'll want to setup the versions plugin to only update what you want:
<plugin>
<g...
Is std::vector so much slower than plain arrays?
...a #3 - Remove constructors
What about removing the constructors entirely? Then perhaps gcc can optimize out the construction of all of the objects when the vectors are created. What happens if we change Pixel to:
struct Pixel
{
unsigned char r, g, b;
};
Result: about 10% faster. Still slower...
What is %2C in a URL?
... If you write encodeURIComponent(",") in your JavaScript console, then you will also get %2C. And with decodeURIComponent("%2C") you will get back the ,.
– Benny Neugebauer
Jun 17 '15 at 9:26
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