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http HEAD vs GET performance
...EAD might work nicely.
For example, suppose you want to check if resource 123 exists. A 200 means "yes" and a 404 means "no":
HEAD /resources/123 HTTP/1.1
[...]
HTTP/1.1 404 Not Found
[...]
However, if the "yes" or "no" you want from your REST service is a part of the resource itself, rather th...
jQuery Data vs Attr?
...you'll need to use .attr():
HTML:
<a id="foo" href="#" data-color="ABC123"></a>
<a id="bar" href="#" data-color="654321"></a>
JS:
$('#foo').data('color').length; //6
$('#bar').data('color').length; //undefined, length isn't a property of numbers
$('#foo').attr('data-col...
How do I perform an insert and return inserted identity with Dapper?
...Username = "lorem ipsum",
Phone = "555-123",
Email = "lorem ipsum"
},
tran);
Return inserted object with ID:
If you wanted you could get Phone and Email or even th...
Strangest language feature
...
Or, more usefully, "0123456789abcdef"[x & 0xf]
– Dipstick
Jan 3 '10 at 15:33
17
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淘宝大秒系统设计详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...列顺序执行，这样能减少同一台机器对数据库同一行记录操作的并发度，同时也能控制单个商品占用数据库连接的数量，防止热点商品占用太多数据库连接。
数据库层做排队。应用层只能做到单机排队，但应用机器数本身很...
了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
...系统查询和操作。由于这个原因，程序员不得不使用本机操作系统提供的应用程序编程接口（Application Program Interfaces，API），而这使得代码不能在平台之间移植。以下面的简单情况为例：您需要确定某个文件是否是 Directory 类型...
通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
通过 ulimit 改善系统性能本文介绍了 ulimit 内键指令的主要功能以及用于改善系统性能的 ulimit 使用方法。通过这篇文章，读者不仅可以了解 ulimit 所起的作用，并且可以学会如何更好地通过 ulimit 限制资源的使用来改善系统性能...
An operation on a socket could not be performed because the system lac...
An operation on a socket could not be performed because the system lacked sufficient buffer space(由于系统缓冲区空间不足，或者因为队列已满，不能执行套接字上的操作)An-operation-on-a-socket-could-not-be-performed-because-the-system-lacked-sufficient-buffer-space服务...
An operation on a socket could not be performed because the system lac...
An operation on a socket could not be performed because the system lacked sufficient buffer space(由于系统缓冲区空间不足，或者因为队列已满，不能执行套接字上的操作)An-operation-on-a-socket-could-not-be-performed-because-the-system-lacked-sufficient-buffer-space服务...
An operation on a socket could not be performed because the system lac...
An operation on a socket could not be performed because the system lacked sufficient buffer space(由于系统缓冲区空间不足，或者因为队列已满，不能执行套接字上的操作)An-operation-on-a-socket-could-not-be-performed-because-the-system-lacked-sufficient-buffer-space服务...