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Sharing Test code in Maven
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190
I recommend using type instead of classifier (see also: classifier). It tells Maven a bit mor...
How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...mented)
Modern Versions of PostgreSQL
Suppose you have a table named test1, to which you want to add an auto-incrementing, primary-key id (surrogate) column. The following command should be sufficient in recent versions of PostgreSQL:
ALTER TABLE test1 ADD COLUMN id SERIAL PRIMARY KEY;
Older...
What's the difference between => , ()=>, and Unit=>
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def f(x: => Int) = x * x
If I call it like this
var y = 0
f { y += 1; y }
Then the code will execute like this
{ y += 1; y } * { y += 1; y }
Though that raises the point of what happens if there's a identifier name clash. In traditional call-by-name, a mechanism called capture-avoiding ...
Getting visitors country from their IP
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+1350
Try this simple PHP function.
<?php
function ip_info($ip = NULL, $purpose = "location", $deep_detect = TRUE) {
$output = N...
Are the shift operators () arithmetic or logical in C?
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11 Answers
11
Active
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Getting root permissions on a file inside of vi? [closed]
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10 Answers
10
Active
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Testing if a checkbox is checked with jQuery
If the checkbox is checked, then I only need to get the value as 1; otherwise, I need to get it as 0. How do I do this using jQuery?
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When splitting an empty string in Python, why does split() return an empty list while split('\n') re
...espace. For example:
>>> data = '''\
Shasta California 14,200
McKinley Alaska 20,300
Fuji Japan 12,400
'''
>>> for line in data.splitlines():
print line.split()
['Shasta', 'California', '14,200']
['McKinley', 'Alaska', '20,300']
['Fuji...
Run Cron job every N minutes plus offset
...-59/20 * * * *
Explanation
An * in the minute field is the same as 0-59/1 where 0-59 is the range and 1 is the step. The command will run at the first minute in the range (0), then at all successive minutes that are distant from the first by step (1), until the last (59).
Which is why */20 * * *...