大约有 40,000 项符合查询结果（耗时：0.0638秒） [XML]
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...e multiplies in it, no divide. => Faster!
And: the full update step new_x = x + dx then reads:
x *= 3/2 - y/2 * x * x which is easy too.
share
|
improve this answer
|
fo...
How can I search (case-insensitive) in a column using LIKE wildcard?
...
SELECT *
FROM trees
WHERE trees.`title` COLLATE UTF8_GENERAL_CI LIKE '%elm%'
Actually, if you add COLLATE UTF8_GENERAL_CI to your column's definition, you can just omit all these tricks: it will work automatically.
ALTER TABLE trees
MODIFY COLUMN title VARCHAR(…) CHARA...
How do I create a MongoDB dump of my database?
...for backup you call this command on your terminal
mongodump --db database_name --collection collection_name
To import your backup file to mongodb you can use the following command on your terminal
mongorestore --db database_name path_to_bson_file
...
Can PHP PDO Statements accept the table or column name as parameter?
...er goes directly into the query. So for example:
function buildQuery( $get_var )
{
switch($get_var)
{
case 1:
$tbl = 'users';
break;
}
$sql = "SELECT * FROM $tbl";
}
By leaving no default case or using a default case that returns an error message ...
Using WebAPI or MVC to return JSON in ASP.NET
I'm building an ASP.NET MVC application that is client-script heavy, it will use JSON and jQuery to manipulate the DOM.
6 A...
Adding an arbitrary line to a matplotlib plot in ipython notebook
...e taken in account in the legend by adding a label argument starting with "_". Ex: plt.plot([70, 70], [100, 250], 'k-', lw=2, label="_not in legend")
– gcalmettes
Oct 29 '16 at 5:40
...
Postgresql 9.2 pg_dump version mismatch
...
This only happens when you upgrade PostgreSQL. I just did a fresh install of the OS and didn't have any problems with this.
– Seth
May 1 '14 at 22:53
...
Linux C/C++程序常用的调试手段及异常排查总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...b pull 到 android 系统上(公司开发的是android系统软件，不是app), 说实话，实在无语，原因是 android 系统的 ANR 机制，长时间不操作，调试进程会被系统杀掉，这个后面有时间再研究一下，肯定有更好的办法（不能把ANR机制关了吗 ?...
Detect encoding and make everything UTF-8
...
If you apply utf8_encode() to an already UTF-8 string, it will return garbled UTF-8 output.
I made a function that addresses all this issues. It´s called Encoding::toUTF8().
You don't need to know what the encoding of your strings is. It c...
Automatically add all files in a folder to a target using CMake?
...
It is possible. E.g. with file(GLOB:
cmake_minimum_required(VERSION 2.8)
file(GLOB helloworld_SRC
"*.h"
"*.cpp"
)
add_executable(helloworld ${helloworld_SRC})
Note that this requires manual re-running of cmake if a source file is added or removed, since t...