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How to work around the lack of transactions in MongoDB?
...- they'll be multi-statement, with similar semantics and syntax (like start_transaction and commit_transaction). Importantly, the changes to MongoDB that enable transactions do not impact performance for workloads that do not require them.
For more details see here.
Having distributed transaction...
PEP 8, why no spaces around '=' in keyword argument or a default parameter value?
...able assignment.
For example, there is plenty of code like this:
kw1 = some_value
kw2 = some_value
kw3 = some_value
some_func(
1,
2,
kw1=kw1,
kw2=kw2,
kw3=kw3)
As you see, it makes complete sense to assign a variable to a keyword argument named exactly the same, so it improves r...
What should I do if the current ASP.NET session is null?
...s doing initialization logic during startup, for example on the Application_Start event or by using a static constructor, Session state might not be available. It all boils down to whether there is a current request and AcquireRequestState has been run.
Also, should the client have disabled cookies,...
Given an RGB value, how do I create a tint (or shade)?
...r lighter (tinted) color:
RGB:
To shade:
newR = currentR * (1 - shade_factor)
newG = currentG * (1 - shade_factor)
newB = currentB * (1 - shade_factor)
To tint:
newR = currentR + (255 - currentR) * tint_factor
newG = currentG + (255 - currentG) * tint_factor
newB = currentB + (255 - currentB...
scala vs java, performance and memory? [closed]
...he most compact way to do the same thing is:
val bigEnough = array.filter(_.length > 2).flatMap(mapping.get)
Easy! But, unless you're fairly familiar with how the collections work, what you might not realize is that this way of doing this created an extra intermediate array (with filter), and...
What would be C++ limitations compared C language? [closed]
...ary subset of C++. C is not a subset of C++ at all.
This is valid C:
foo_t* foo = malloc ( sizeof(foo_t) );
To make it compile as C++ you have to write:
foo_t* foo = static_cast<foo_t*>( malloc ( sizeof(foo_t) ) );
which isn't valid C any more. (you could use the C-style cast, it which...
Necessary to add link tag for favicon.ico?
... images folder or something alike. For example:
<link rel="icon" href="_/img/favicon.png">
This diferent location may even be a CDN, just like SO seems to do with <link rel="shortcut icon" href="http://cdn.sstatic.net/stackoverflow/img/favicon.ico">.
To learn more about using other f...
Preferred Github workflow for updating a pull request after code review
...uming that no-one cares because it is a fork.
– brita_
Feb 7 '15 at 11:02
2
Follow-up: best pract...
How do I install a custom font on an HTML site
...
Try this
@font-face {
src: url(fonts/Market_vilis.ttf) format("truetype");
}
div.FontMarket {
font-family: Market Deco;
}
<div class="FontMarket">KhonKaen Market</div>
vilis.org
...
Retrieving the last record in each group - MySQL
...is standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is the original answer I wrote for this question in 2009:
...