大约有 10,709 项符合查询结果（耗时：0.0292秒） [XML]
How to find duplicates in 2 columns not 1
... 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.
...
Android - Set fragment id
How can I set a Fragment 's Id so that I can use getSupportFragmentManager().findFragmentById(R.id.--) ?
7 Answers
...
C/C++ Struct vs Class
...shing my C++ class it seemed to me the structs/classes are virtually identical except with a few minor differences.
6 Answe...
Are there any style options for the HTML5 Date picker?
...d
::-webkit-datetime-edit-year-field
::-webkit-inner-spin-button
::-webkit-calendar-picker-indicator
So if you thought the date input could use more spacing and a ridiculous color scheme you could add the following:
::-webkit-datetime-edit { padding: 1em; }
::-webkit-datetime-edit-fields-wra...
Loading Backbone and Underscore using RequireJS
...kbone and Underscore, it seems kind of tricky. For one, Underscore automatically registers itself as a module, but Backbone assumes Underscore is available globally. I should also note that Backbone doesn't seem to register itself as a module which makes it kind of inconsistent with the other libs. ...
Django filter queryset __in for *every* item in list
...s suggested by jpic and sgallen in the comments, to add .filter() for each category. Each additional filter adds more joins, which should not be a problem for small set of categories.
There is the aggregation approach. This query would be shorter and perhaps quicker for a large set of categories.
...
What database does Google use?
...stem (built by Google) for managing structured data
that is designed to scale to a very
large size: petabytes of data across
thousands of commodity servers.
Many projects at Google store data in
Bigtable, including web indexing,
Google Earth, and Google Finance.
These applications p...
Is Meyers' implementation of the Singleton pattern thread safe?
....
In C++03, this code wasn't thread safe. There is an article by Meyers called "C++ and the Perils of Double-Checked Locking" which discusses thread safe implementations of the pattern, and the conclusion is, more or less, that (in C++03) full locking around the instantiating method is basically ...
How do I get the opposite (negation) of a Boolean in Python?
...
You can just use:
return not bool
share
|
improve this answer
|
follow
|
...
Regular expression for letters, numbers and - _
...racter Classes and Repetition
In PHP
Here's a snippet to show how you can use this pattern:
<?php
$arr = array(
'screen123.css',
'screen-new-file.css',
'screen_new.js',
'screen new file.css'
);
foreach ($arr as $s) {
if (preg_match('/^[\w.-]*$/', $s)) {
print "$s is a match\...