大约有 47,000 项符合查询结果（耗时：0.0549秒） [XML]
How to reverse a singly linked list using only two pointers?
...st use a doubly linked list if you think you are going to need the reverse order.
share
|
improve this answer
|
follow
|
...
How can I group by date time column without taking time into consideration
I have a bunch of product orders and I'm trying to group by the date and sum the quantity for that date. How can I group by the month/day/year without taking the time part into consideration?
...
How can I prevent SQL injection in PHP?
...dcoded in your script and chosen from that set.
For example, to do dynamic ordering:
$orders = array("name", "price", "qty"); // Field names
$key = array_search($_GET['sort'], $orders)); // if we have such a name
$orderby = $orders[$key]; // If not, first one will be set automatically.
$query = "S...
Why isn't sizeof for a struct equal to the sum of sizeof of each member?
... @YoYoYonnY that's not possible. The compiler is not allowed to reorder struct members although gcc has an experimental option to do that
– phuclv
Mar 2 '17 at 2:57
...
scp with port number specified
...vily upvoted) comments:
With regard to Abdull's comment about scp option order, what he suggests:
scp -P80 -r some_directory -P 80 ...
..., intersperses options and parameters. getopt(1) clearly defines that parameters must come after options and not be interspersed with them:
The parameter...
psql: FATAL: Ident authentication failed for user “postgres”
...
Edit the file /etc/postgresql/8.4/main/pg_hba.conf and replace ident or peer by either md5 or trust, depending on whether you want it to ask for a password on your own computer or not.
Then reload the configuration file with:
/etc/init.d/p...
What's the difference between UTF-8 and UTF-8 without BOM?
...t use a BOM or where the BOM is used as a UTF-8 signature. See the “Byte Order Mark” subsection in Section 16.8, Specials, for more information.
share
|
improve this answer
|
...
How to prevent Browser cache for php site
...0', FALSE);
header('Pragma: no-cache');
AND Option 2 IS ALWAYS BETTER in order to avoid proxy based caching issue.
share
|
improve this answer
|
follow
|
...
What is the correct way to make a custom .NET Exception serializable?
... sure you call through to base.GetObjectData(info, context) at the end, in order to let the base class save its own state.
SerializableExceptionWithCustomProperties.cs:
namespace SerializableExceptions
{
using System;
using System.Collections.Generic;
using System.Runtime.Serializati...
How does HashSet compare elements for equality?
...y the default equality comparer.
Note how none of this is in terms of an ordered comparison - which makes sense, as there are certainly situations where you can easily specify equality but not a total ordering. This is all the same as Dictionary<TKey, TValue>, basically.
If you want a set w...