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How to “EXPIRE” the “HSET” child key in redis?
I need to expire all keys in redis hash, which are older than 1 month.
11 Answers
11
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Difference between null and empty (“”) Java String
...efined on the empty string - you can convert it to lower case, look up the index of some character in it, etc. The null string null is "no string at all." It doesn't have a length because it's not a string at all. Trying to apply any standard string operation to the null string will cause a NullP...
Flatten list of lists [duplicate]
... 147.2, 138.2]
then you can access individual items with the appropriate index, e.g., new_d[0] will give you 180.0 etc which you can then use for math.
If you are going to have a collection of data, you will have some sort of bracket or parenthesis.
Note, this solution is aimed specifically at y...
C++0x has no semaphores? How to synchronize threads?
...ck Overflow regarding the use of semaphores. I use them (posix semaphores) all the time to let a thread wait for some event in another thread:
...
Rails - How to use a Helper Inside a Controller
... end
end
end
class ExamplesController < ApplicationController
def index
current_datetime = helpers.datetime_format DateTime.now
raise current_datetime.inspect
end
end
OUTPUT
"2018-12-10 01:01 AM"
s...
UIPanGestureRecognizer - Only vertical or horizontal
I have a view that has a UIPanGestureRecognizer to drag the view vertically. So in the recognizer callback, I only update the y-coordinate to move it. The superview of this view, has a UIPanGestureRecognizer that will drag the view horizontally, just updating the x-coordinate.
...
Adding a Method to an Existing Object Instance
...that instance will be passed as the first argument whenever the method is called.
Callables that are attributes of a class (as opposed to an instance) are still unbound, though, so you can modify the class definition whenever you want:
>>> def fooFighters( self ):
... print "fooFighters...
multiprocessing: sharing a large read-only object between processes?
...ults from stdin, does work, writes intermediate results on stdout.
Connect all the workers as a pipeline:
process1 <source | process2 | process3 | ... | processn >result
Each process reads, does work and writes.
This is remarkably efficient since all processes are running concurrently. T...
Single TextView with multiple colored text
...
Not working for me getting ` java.lang.StringIndexOutOfBoundsException: length=3; index=12`
– Muhammad Babar
Nov 26 '15 at 10:35
1
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Why does modern Perl avoid UTF-8 by default?
...?????????????????????
Set your PERL_UNICODE envariable to AS. This makes all Perl scripts decode @ARGV as UTF‑8 strings, and sets the encoding of all three of stdin, stdout, and stderr to UTF‑8. Both these are global effects, not lexical ones.
At the top of your source file (program, module, l...