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How to define a custom ORDER BY order in mySQL
...hros in the table definition, you specify it as an ENUM instead of VARCHAR etc. Internally MySQL stores the ENUM options in a specific order and indexes them, and so when ordering by an ENUM column specifically it will use that internal index instead of the string values ( unless CAST() is used to ...
How does @synchronized lock/unlock in Objective-C?
... is handled at runtime. This allows for optimization on uncontended locks, etc.
– Quinn Taylor
Aug 1 '09 at 1:18
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What is the shortest function for reading a cookie by name in JavaScript?
...eliable and more performant than the current best-voted answer:
function getCookieValue(a) {
var b = document.cookie.match('(^|;)\\s*' + a + '\\s*=\\s*([^;]+)');
return b ? b.pop() : '';
}
A performance comparison of various approaches is shown here:
http://jsperf.com/get-cookie-value-re...
SQL select only rows with max value on a column [duplicate]
...nce friendly, however your mileage may vary (RDBMS, DB Structure, Indexes, etc.). So when you pick one approach over the other, benchmark. And make sure you pick the one which make most of sense to you.
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Input and output numpy arrays to h5py
...simple binary formats provided by numpy natively such as np.save, np.savez etc:
http://docs.scipy.org/doc/numpy/reference/routines.io.html
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What does a tilde do when it precedes an expression?
...needed ++ and -- in a while because of primitive methods like map, forEach etc. My point is more about why they didn't also consider ~ excessively tricky when whatever standard used includes increment and decrement operators. To forbid something so CIS101 doesn't make any sense.
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Creating a config file in PHP
... comment - none of the parsing mechanisms would be the fastest (ini, json, etc) - but they're also not the parts of your application that you'd really need to focus on optimizing since the speed difference would be negligible on such small files.
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Hibernate Annotations - Which is better, field or property access?
...an use to modify the document - a set of buttons, tools, keyboard commands etc. However, when you choose to persist (Save) that document, it saves the internal state, not the set of keypresses and mouse clicks used to generate it.
Saving the internal state of the object DOES NOT break encapsulatio...
Partly JSON unmarshal into a map in Go
...use the string is still not decoded (wrapping " and escaped \n-characters, etc), so I will unmarshal it too.
– ANisus
Jun 17 '12 at 8:00
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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...接赋值，还可以用语句给变量赋值，如：
for file in `ls /etc`
使用变量
使用一个定义过的变量，只要在变量名前面加美元符号即可，如：
your_name="qinjx"
echo $your_name
echo ${your_name}
变量名外面的花括号是可选的，加不加都行...