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由12306.cn谈谈网站性能技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术
由12306.cn谈谈网站性能技术12306.cn网站挂了，被全国人民骂了。我这两天也在思考这个事，我想以这个事来粗略地和大家讨论一下网站性能的问题。因为仓促，而且完全基于...12306.cn网站挂了，被全国人民骂了。我这两天也在思考...
How do you run a SQL Server query from PowerShell?
...Hub so that you can now go to your modules directory and execute git clone https://github.com/ChrisMagnuson/InvokeSQL and from that point forward invoke-sql will automatically be loaded when you go to use it (assuming your using PowerShell v3 or later).
...
Calculating moving average
...comment from @Ricardo Cruz:
cx <- c(0, cumsum(ifelse(is.na(x), 0, x)))
cn <- c(0, cumsum(ifelse(is.na(x), 0, 1)))
rx <- cx[(n+1):length(cx)] - cx[1:(length(cx) - n)]
rn <- cn[(n+1):length(cx)] - cn[1:(length(cx) - n)]
rsum <- rx / rn
This still has the issue that if all the values ...
Focusable EditText inside ListView
...;activity android:name= ".yourActivity" android:windowSoftInputMode="adjustPan"/>
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When should we use Observer and Observable?
...ermanent address is changed then you need to notify passport authority and pan card authority. So here passport authority and pan card authority are observers and You are a subject.
On Facebook also, If you subscribe to someone then whenever new updates happen then you will be notified.
When to us...
How can I create a self-signed cert for localhost?
I've gone through the steps detailed in How do you use https / SSL on localhost? but this sets up a self-signed cert for my machine name, and when browsing it via https://localhost I receive the IE warning.
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keytool error :java.io.IoException:Incorrect AVA format
...PatrickTaylor -validity 10000
-keystore C:\drops\patrickkeystore
-dname "cn=Patrick Taylor, ou=engineering, o=company, c=US"
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What does ~> mean in a gem file [duplicate]
In the gem file for https://github.com/justinfrench/formtastic they have:
1 Answer
1...
CSS to stop text wrapping under image
... to use a <p> element as a parent for your <span>.
<li id="CN2787">
<img class="fav_star" src="images/fav.png">
<p>
<span>Text, text and more text</span>
</p>
</li>
Since <p> is a block element, you can set its width using CSS...
Vertically centering a div inside another div [duplicate]
...sted in:
FF3.5+
FF4+
Safari 5+
Chrome 11+
IE9+
HTML
<div class="cn"><div class="inner">your content</div></div>
CSS
.cn {
display: table-cell;
width: 500px;
height: 500px;
vertical-align: middle;
text-align: center;
}
.inner {
display: inline-block;
...