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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...己的特点来关闭）
setsockopt(sock_fd, IPPROTO_TCP, TCP_NODELAY, (char *)&value,sizeof(int));
另外，网上有些文章说TCP_CORK的socket option是也关闭Nagle算法，这个还不够准确。TCP_CORK是禁止小包发送，而Nagle算法没有禁止小包发送，只是禁止了大...
Pad a string with leading zeros so it's 3 characters long in SQL Server 2008
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If the field is already a string, this will work
SELECT RIGHT('000'+ISNULL(field,''),3)
If you want nulls to show as '000'
It might be an integer -- then you would want
SELECT RIGHT('000'+CAST(field AS VARCHAR(3)),3)
As required by the question this answer only w...
Formatting Numbers by padding with leading zeros in SQL Server
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Change the number 6 to whatever your total length needs to be:
SELECT REPLICATE('0',6-LEN(EmployeeId)) + EmployeeId
If the column is an INT, you can use RTRIM to implicitly convert it to a VARCHAR
SELECT REPLICATE('0',6-LEN(RTRIM(EmployeeId))) + RTRIM(EmployeeId)
And the code to re...
Express.js: how to get remote client address
I don't completely understand how I should get a remote user IP address.
16 Answers
16...
Is it possible to have SSL certificate for IP address, not domain name?
...o simply try and order one with the provider of your choice, and enter the IP address instead of a domain during the ordering process.
However, running a site on an IP address to avoid the DNS lookup sounds awfully like unnecessary micro-optimization to me. You will save a few milliseconds at best,...
How to filter by IP address in Wireshark?
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Match destination: ip.dst == x.x.x.x
Match source: ip.src == x.x.x.x
Match either: ip.addr == x.x.x.x
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Detecting 'stealth' web-crawlers
... goes the whole argument. who says web crawlers visits sites in sequential selections? another huge assumption.
– KJW
Oct 9 '13 at 0:34
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MySQL - How to select data by string length
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select LENGTH('Ö'); results 2!! András Szepesházi's answer is the correct one!
– fubo
Oct 24 '13 at 13:59
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IISExpress returns a 503 error from remote machines
... One more hint: If you right-click on IISExpress' systray icon, you can select "Show all applications" which will open up a dialog showing all applications you're currently running locally. Right-click on the desired application (don't left-click or it will open the browser), then you will see "P...
How do you create a random string that's suitable for a session ID in PostgreSQL?
...sion verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this?
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