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为什么一般逆时针旋转是拧松? - 杂谈 - 清泛网 - 专注C/C++及内核技术
...rews and bolts is that supination(旋后肌) of the arm, which is used by a right-handed person to turn a screw clockwise, is generally stronger than pronation(旋前肌).
旋前:小臂向身体内侧旋转(逆时针拧门把手时候的动作)
旋后:小臂向身体外侧旋转...
MySQL (\'root\'@\'%\') does not exist 的问题 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...ot -pPasswd
mysql >grant all privileges on *.* to root@"%" identified by "Passwd" ;
mysql >flush privileges;MySQL root
MongoDB仿关系型数据库Group聚合例子 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...pDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate
namespace MongoGroupDemo
{
class Program
{
private static string MongoConnStr = "mongodb://172.16.86.53:27017";
/// <summary>
/// MongoDB Group,max...
PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...duce两步即可,这里有一个PDF文档生动的说明了MySQL中GROUP BY和MongoDB中MapReduce的对应关系:
SQL to MongoDB
此外,还有很多资料可供参考,如:MongoDB Aggregation III: Map-Reduce Basics。
说明:软件版本为MongoDB 1.6.5,PECL Mongo 1.1.4。不同...
推荐引擎easyrec半天学习分享 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...so viewed
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PHP屏蔽警告错误,PHP不输出警告错误 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ine 43
Warning: Cannot modify header information - headers already sent by (output started at /usr/local/tads/htdocs/XXXXXX/src/config/env.php:5) in/usr/local/taesdk/1.0/phplib3/src/base/core/TMWebResponse.class.php on line 332
有的时候代码的警告会导致整个项目无法运行,比...
php:获取数组第一个值 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... $array = array('step one', 'step two', 'step three', 'step four');
03 // by default, the pointer is on the first element
04 echo current($array) . "<br />\n"; // "step one"
05 // skip two steps
06 next($array);
07 next($array);
08 echo current($array) . "<br />\n"; // "step three"
09 // rese...
闲扯Nginx的accept_mutex配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...s. Therefore turning accept_mutex off is as scheduling incoming connection by OS via select/kqueue/epoll/etc (but not accept()).
简单点说:Apache动辄就会启动成百上千的进程,如果发生惊群问题的话,影响相对较大;但是对Nginx而言,一般来说,worker_proces...
Subversion钩子 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...脚本执行后会显示不知所云的错误信息:svn: Commit blocked by pre-commit hook (exit code 255) with no output。
本文以pre-commit为例说明了一下钩子的用法,实际上其他脚本也很有用,比如说如果你想在提交代码后发一条微博,就可以利用post-c...
Access-Control-Allow-Origin与跨域 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...没人会用 *
Request header field X-Requested-With is not allowed by Access-Control-Allow-Headers.
注释掉:aj.XMLHttpRequest.setRequestHeader('X-Requested-With', 'XMLHttpRequest');Access-Control-Allow-Origin 跨域
