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Fastest way to determine if an integer's square root is an integer
...about 1/8 of the residues mod 255 are squares. However, in my experience, calling the modulo operator (%) costs more than the benefit one gets, so I use bit tricks involving 255 = 2^8-1 to compute the residue. (For better or worse, I am not using the trick of reading individual bytes out of a word...
:not(:empty) CSS selector is not working?
...
Being a void element, an <input> element is considered empty by the HTML definition of "empty", since the content model of all void elements is always empty. So they will always match the :empty pseudo-class, whether or not they ...
How can I see the specific value of the sql_mode?
...ier the former is correct. If @@sql_mode is empty (the "blank" mode as you call it), then no sql_mode is set. I won't comment on the default sql_mode because that depends which version of MySQL you are running.
– Ike Walker
Apr 25 '16 at 13:27
...
Redis key naming conventions?
...s website is stated: Try to stick with a schema. For instance "object-type:id:field" can be
a nice idea, like in "user:1000:password". I like to use dots for
multi-words fields, like in "comment:1234:reply.to".
Are you able to query for just the beginning of the key to return all
users?
If y...
When using Spring Security, what is the proper way to obtain current username (i.e. SecurityContext)
...urrent user is logged in /
* authenticated.
* <p>
* Equivalent of calling:
* <p>
* <code>getCurrentUser() != null</code>
*
* @return if user is logged in
*/
public static boolean isLoggedIn() {
return getCurrentUser() != null;
}
...
Limit number of characters allowed in form input text field
...opriately. The default is unlimited.
<input type="text" maxlength="2" id="sessionNo" name="sessionNum" onkeypress="return isNumberKey(event)" />
However, this may or may not be affected by your handler. You may need to use or add another handler function to test for length, as well.
...
Add a new column to existing table in a migration
...se the migrate:make command on the Artisan CLI. Use a specific name to avoid clashing with existing models
for Laravel 3:
php artisan migrate:make add_paid_to_users
for Laravel 5+:
php artisan make:migration add_paid_to_users_table --table=users
You then need to use the Schema::table() meth...
What is the `sensor` parameter for in the Google Places API?
...p;sensor parameter is no longer required for JavaScript or Web Service API calls. The parameter will now be ignored if passed along with any request.
docs - https://developers.google.com/maps/documentation/javascript/tutorial
...
Xcode 4, Core Data Model Version - Set Current Version
...is...
In your CustomCoreDataManager.m:
#import "ObjectiveRecord.h"
and call the init method like this
- (instancetype)init {
self = [super init];
if (self) {
[[CoreDataManager sharedManager] setModelName:@"YourModelName"];
}
return self;
}
...
Delete all data in SQL Server database
... It might also make sense to do a EXEC sp_MSForEachTable 'DBCC CHECKIDENT(''?'', RESEED, 0)' after the DELETE FROM to reset all the identity columns back to 0.
– Jonathan Amend
Nov 7 '13 at 21:46
...