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mongo group query how to keep fields
...h group, you can try aggregating like:
db.test.aggregate({
$group: {
_id : '$name',
name : { $first: '$name' },
age : { $first: '$age' },
sex : { $first: '$sex' },
province : { $first: '$province' },
city : { $first: '$city' },
area : { $first: '$area' },
address : { $firs...
PHP script - detect whether running under linux or Windows?
...s that I can see.
– Shabbyrobe
Jun 16 '11 at 4:48
6
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Illegal pattern character 'T' when parsing a date string to java.util.Date
...
206
Update for Java 8 and higher
You can now simply do Instant.parse("2015-04-28T14:23:38.521Z") an...
back button callback in navigationController in iOS
...elegate if it should pop the top UINavigationItem by calling navigationBar(_:shouldPop:). UINavigationController actually implement this, but it doesn't publicly declare that it adopts UINavigationBarDelegate (why!?). To intercept this event, create a subclass of UINavigationController, declare its ...
SQLite in Android How to update a specific row
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edited Dec 16 '15 at 12:53
akshay7692
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a...
Are duplicate keys allowed in the definition of binary search trees?
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ChrisChris
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How to implement the --verbose or -v option into a script?
...unction (or if you're willing to use print as a function in 2.x using from __future__ import print_function) it's even simpler:
verboseprint = print if verbose else lambda *a, **k: None
This way, the function is defined as a do-nothing if verbose mode is off (using a lambda), instead of constantl...
Real differences between “java -server” and “java -client”?
...anced static analysis and compilation techniques.
Note: The release of jdk6 update 10 (see Update Release Notes:Changes in 1.6.0_10) tried to improve startup time, but for a different reason than the hotspot options, being packaged differently with a much smaller kernel.
G. Demecki points out in t...
How to extract a substring using regex
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edited May 6 '16 at 11:05
holmis83
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