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JOIN queries vs multiple queries
...ponential memory leak issue. Grab all of the data, then use a server-side scripting language to sort it out:
SELECT * FROM Address WHERE Personid IN(1,2,3);
Results:
Address.id : 1 // First person and their address
Address.Personid : 1
Address.City : "Boston"
Address.id : 2 ...
rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)
...y in sprockets require, but only if you include them with <link>/<script>
– elado
Jan 9 '13 at 10:04
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pip issue installing almost any library
...tion found for pytest-cov
Update April 2018:
To anyone getting the TLSV1_ALERT_PROTOCOL_VERSION error: it has nothing to do with trusted-host/verification issue of the OP or this answer. Rather the TLSV1 error is because your interpreter does not support TLS v1.2, you must upgrade your interpreter...
How do I check if file exists in jQuery or pure JavaScript?
How do I check if a file on my server exists in jQuery or pure JavaScript?
17 Answers
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WebSockets vs. Server-Sent events/EventSource
...yfilled into older browsers that do not support it natively using just JavaScript. Some implementations of SSE polyfills can be found on the Modernizr github page.
Gotchas:
SSE suffers from a limitation to the maximum number of open connections, which can be specially painful when opening various...
Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail
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You can achieve it like this:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script>
window.jQuery || document.write('<script src="/path/to/your/jquery"><\/script>');
</script...
How do I see a C/C++ source file after preprocessing in Visual Studio?
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For C++ code, it's actually a lot harder. For GCC/g++, I found this Perl script useful.
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When should I use uuid.uuid1() vs. uuid.uuid4() in python?
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My team just ran into trouble using UUID1 for a database upgrade script where we generated ~120k UUIDs within a couple of minutes. The UUID collision led to violation of a primary key constraint.
We've upgraded 100s of servers but on our Amazon EC2 instances we ran into this issue a few t...
When to use IMG vs. CSS background-image?
...er {
background-image:url(image_2.jpg);
}
This saves any kind of JavaScript or jQuery animation to fade an <img/>'s src.
More information about transitions on MDN.
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Java compile speed vs Scala compile speed
...la seems to consume a lot of time. I hear that with many large projects a scripting language becomes very important because of the time compiling takes, a need that I didn't see arising when I was using Java.
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