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How to set current working directory to the directory of the script in bash?
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It's worth noting that things can break if a symbolic link makes up part of $0. In your script you may expect, for example, ../../ to refer to the directory two levels above the script's location, but this isn't necessarily the case if symbolic links are in play.
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How can I convert a comma-separated string to an array?
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While split will work fine if you are sure you have elements in array, if you're expecting data from a server / database you will run into trouble since ''.split(',') has a length === 1 IE: ''.split(',') === ['']
– oportocala
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Does a finally block always get executed in Java?
...e try or catch code blocks.
The only times finally won't be called are:
If you invoke System.exit()
If you invoke Runtime.getRuntime().halt(exitStatus)
If the JVM crashes first
If the JVM reaches an infinite loop (or some other non-interruptable, non-terminating statement) in the try or catch blo...
Get key by value in dictionary
...items(): # for name, age in dictionary.iteritems(): (for Python 2.x)
if age == search_age:
print(name)
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What .NET collection provides the fastest search
... answer to "What is the fastest searchable collection" depends on your specific data size, ordered-ness, cost-of-hashing, and search frequency.
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How to check if a string in Python is in ASCII?
...de is better, because string no decode method in python 3, see what's the difference between encode/decode? (python 2.x)
– Jet Guo
May 8 '11 at 15:21
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When is it better to use an NSSet over an NSArray?
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If ordered: O(1) vs O(logn) since binary search is applicable. If unordered, then O(1) vs O(n)
– baskInEminence
May 25 '16 at 21:26
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How do I remove repeated elements from ArrayList?
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If you don't want duplicates in a Collection, you should consider why you're using a Collection that allows duplicates. The easiest way to remove repeated elements is to add the contents to a Set (which will not allow duplica...
Check if a method exists
Is there any way I can test if a method exists in Objective-C?
5 Answers
5
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Unable to cast object of type 'System.DBNull' to type 'System.String`
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EDIT: Haven't paid attention to ExecuteScalar. It does really return null if the field is absent in the return result. So use instead:
return (accountNumber == null) ? string.Empty : accountNumber.ToString()
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