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add column to mysql table if it does not exist
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Note that INFORMATION_SCHEMA isn't supported in MySQL prior to 5.0. Nor are stored procedures supported prior to 5.0, so if you need to support MySQL 4.1, this solution isn't good.
One solution used by frameworks that use database migrations is to record in your database a revision num...
Get exit code of a background process
...# simulate a long process that will have an identifiable exit code
(sleep 15 ; /bin/false) &
my_pid=$!
while ps | grep " $my_pid " # might also need | grep -v grep here
do
echo $my_pid is still in the ps output. Must still be running.
sleep 3
done
echo Oh, it looks like the pro...
Do I need to disable NSLog before release Application?
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answered Jan 8 '10 at 5:40
RaminRamin
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Meaning of = delete after function declaration
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215
Deleting a function is a C++11 feature:
The common idiom of "prohibiting copying" can now be...
Which machine learning classifier to choose, in general? [closed]
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95
First of all, you need to identify your problem. It depends upon what kind of data you have an...
Is bool a native C type?
...r = &boolArray[123]).
– Dai
Apr 5 at 0:05
add a comment
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Accept function as parameter in PHP
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153
It's possible if you are using PHP 5.3.0 or higher.
See Anonymous Functions in the manual.
In...
json_decode to array
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850
As per the documentation, you need to specify if you want an associative array instead of an ob...
How do you check if a variable is an array in JavaScript? [duplicate]
...her ways are:
Array.isArray(variable)
Update May 23, 2019 using Chrome 75, shout out to @AnduAndrici for having me revisit this with his question
This last one is, in my opinion the ugliest, and it is one of the slowest fastest. Running about 1/5 the speed as the first example. This guy is about ...