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How to use redis PUBLISH/SUBSCRIBE with nodejs to notify clients when data values change?
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Handle redis errors to stop nodejs from exiting. You can do this by writing;
subcribe.on("error", function(){
//Deal with error
})
I think you get the exception because you are using the same client which is subscribed to publish mes...
How do I modify a MySQL column to allow NULL?
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Your syntax error is caused by a missing "table" in the query
ALTER TABLE mytable MODIFY mycolumn varchar(255) null;
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How can I get the current network interface throughput statistics on Linux/UNIX? [closed]
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Parsing ifconfig output is error-prone, for instance the above one-liner results in -bash: export: overruns:0': not a valid identifier` for me on RHEL6. Parsing /sys/class/net/$dev/statistics (see the perl script in @ephemient answer) directly works mu...
How is location accuracy measured in Android?
...ation is within that radius of the measured point in meters. Assuming that errors are normally distributed (which, as the docs say, is not necessarily true), that means that this is one standard deviation. For example, if Location.getAccuracy returns 10, then there's a 68% chance the true location o...
Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint
Below is the error message I receive in the debug area. It runs fine and nothing is wrong except that I receive this error. Would this prevent apple accepting the app? How do I fix it?
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How can I pass arguments to a batch file?
...like "&"^&, as it's not possible to access %1 without producing an error.
set var=%1
set "var=%1"
set var=%~1
set "var=%~1"
The lines expand to
set var="&"&
set "var="&"&"
set var="&"&
set "var="&"&"
And each line fails, as one of the & is ou...
How to replace master branch in Git, entirely, from another branch? [duplicate]
...s for the detailed response, when I run 'git push remote :master' I get an error - 'remote' does not appear to be a git repository.
– Jason
May 19 '10 at 4:02
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TypeError: sequence item 0: expected string, int found
...be unicode strings and therefore may cause the str to throw a UnicodeEncodeError error. In that case, replace the function str by the function unicode.
For example, assume the string Libië (Dutch for Libya), represented in Python as the unicode string u'Libi\xeb':
print str(u'Libi\xeb')
throws ...
Why should I use a pointer rather than the object itself?
... by the amount of members in the initializer
arr = { 1, 2, 3, 4, 5 }; // ERROR
On the other hand, you can do whatever you want with pointers. Unfortunately, because the distinction between pointers and arrays are hand-waved in Java and C#, beginners don't understand the difference.
3. Polym...
How to apply a function to two columns of Pandas dataframe
...]:x[2] + 1] and df['col_3'] = df.apply(get_sublist, axis=1) gives 'ValueError: operands could not be broadcast together with shapes (2) (3)'
– bigbug
Nov 16 '12 at 7:11
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