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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
...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多，这种排队方式控制并发仍然有限，所以如果能...
Best way to do nested case statement logic in SQL Server
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a user-defined function may server better, at least to hide the logic - esp. if you need to do this in more than one query
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How to set environment variable or system property in spring tests?
...are different from the environment variables that are more complex to set, esp. for tests. Thankfully, below class can be used for that and the class docs has good examples
EnvironmentVariables.html
A quick example from the docs, modified to work with @SpringBootTest
@SpringBootTest
public class...
Laravel 4: how to “order by” using Eloquent ORM [duplicate]
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I like this answer the best vs handling in-line, esp if you are handling multiple order conditions. Thanks! _.orderBy(this.users, ['name', 'last_login'], ['asc', 'desc'])
– kaleazy
Mar 22 '19 at 20:37
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How do I extract the contents of an rpm?
... try the rpm2cpio commmand? See the example below:
$ rpm2cpio php-5.1.4-1.esp1.x86_64.rpm | cpio -idmv
/etc/httpd/conf.d/php.conf
./etc/php.d
./etc/php.ini
./usr/bin/php
./usr/bin/php-cgi
etc
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Get everything after the dash in a string in javascript
...that substr() might not be supported on earlier versions of some browsers (esp. Netscape/Opera).
Your post indicates that you already know how to do it using substring() and indexOf(), so I'm not posting a code sample.
shar...
Count all occurrences of a string in lots of files with grep
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nice to see an approach not using grep, esp as my grep (on windows) doesn't support the -o option.
– David Roussel
Mar 12 '13 at 15:14
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Selecting all text in HTML text input when clicked
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Yeah, it's my favourite way to do this kind of task, esp. as it works for contenteditable elements as well. I think you can also make it even slightly more elegant, i.e. <input type="text" onfocus="document.execCommand('selectall')"> - pretty sure you can remove the null ...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...cted Secondary/Secondary Inconsistent/Inconsistent C
cs：表示连接状态
ro: 表示主从关系 上面的表示都为从
ds：硬盘状态信息 上面表示已经实时同步中，Inconsistent：不一致
# cat /proc/drbd
version: 8.4.6 (api:1/proto:86-101)
GIT-hash: 83...
How to launch Safari and open URL from iOS app
...l to Swift developers, it's a new language without a lot of documentation, esp. on solving real world iOS problems. In my case, autocomplete had chosen the "fileURLWithPath:" selector and I didn't realize that was why my URL was not opening, it was only by reading Dustin's answer that I saw that I s...