大约有 40,000 项符合查询结果（耗时：0.0552秒） [XML]
What is the purpose of Order By 1 in SQL select statement?
...
Also see:
http://www.techonthenet.com/sql/order_by.php
For a description of order by. I learned something! :)
I've also used this in the past when I wanted to add an indeterminate number of filters to a sql statement. Sloppy I know, but it worked. :P
...
What is the pythonic way to avoid default parameters that are empty lists?
...he preferred way in this example is to say: if working_list is None . The caller might have used an empty list-like object with a custom append.
– tzot
Dec 14 '08 at 12:45
5
...
Formatting a number with exactly two decimals in JavaScript
... = +value;
exp = +exp;
if (isNaN(value) || !(typeof exp === 'number' && exp % 1 === 0))
return NaN;
// Shift
value = value.toString().split('e');
value = Math.round(+(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp)));
// Shift back
value = value.toString().split('e...
Disable Laravel's Eloquent timestamps
...your Model:
public $timestamps = false;
And that's it!
Example:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Post extends Model
{
public $timestamps = false;
//
}
To disable timestamps for one operation (e.g. in a controller):
$post->content = 'Your...
Undefined method 'task' using Rake 0.9.0
...kip the first step, but then you have to run rake using bundle exec, for example:
bundle exec rake db:migrate
Otherwise you get the following error.
rake aborted!
You have already activated rake 0.9.0, but your Gemfile requires rake 0.8.7. Consider using bundle exec.
Update
As Alex Chaffee no...
Cannot simply use PostgreSQL table name (“relation does not exist”)
I'm trying to run the following PHP script to do a simple database query:
11 Answers
1...
How to resume Fragment from BackStack if exists
... manager.popBackStackImmediate (backStateName, 0);
if (!fragmentPopped && manager.findFragmentByTag(fragmentTag) == null){ //fragment not in back stack, create it.
FragmentTransaction ft = manager.beginTransaction();
ft.replace(R.id.content_frame, fragment, fragmentTag);
ft.se...
Django rest framework, use different serializers in the same ModelViewSet
... like to provide two different serializers and yet be able to benefit from all the facilities of ModelViewSet :
6 Answers
...
What is the logic behind the “using” keyword in C++?
...shall not appear in the type-id.
Bjarne Stroustrup provides a practical example:
typedef void (*PFD)(double); // C style typedef to make `PFD` a pointer to a function returning void and accepting double
using PF = void (*)(double); // `using`-based equivalent of the typedef above
using P = []...
Try catch statements in C
...egree with setjmp and longjmp calls.
static jmp_buf s_jumpBuffer;
void Example() {
if (setjmp(s_jumpBuffer)) {
// The longjmp was executed and returned control here
printf("Exception happened here\n");
} else {
// Normal code execution starts here
Test();
}
}
void Test() {
...