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If table exists drop table then create it, if it does not exist just create it
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Well... Huh. For years nobody mentioned one subtle thing.
Despite DROP TABLE IF EXISTS `bla`; CREATE TABLE `bla` ( ... ); seems reasonable, it leads to a situation when old table is already gone and new one has not been yet created: some client may try to acc...
Regular expression for matching HH:MM time format
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Because the regex in the answer works well. And the one you commented works too. Feel free to use either of them. :)
– Niket Pathak
Dec 18 '18 at 10:02
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What is the difference between an interface and abstract class?
...ces because classes can implement multiple interfaces but can only inherit one class
– Ogen
Oct 31 '15 at 1:34
25
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What is the difference between '>' and a space in CSS selectors?
...ements inside <div> element even if they are nested inside more than one element. The > selects all the children of <div> element but if they are not inside another element.
Take a look at two examples:
> (Greater than):
div > span {
color: #FFBA00 ;
}
<body>
<...
Eclipse: Set maximum line length for auto formatting?
...u will need to make your own profile to make these changes in if you using one of the [Built-in] ones. Just click "New..." on the formatter preferences page.
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Java, Simplified check if int array contains int
...re any reason not to use ArrayUtils.contains
– mjohnsonengr
Dec 23 '14 at 17:52
2
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Linux bash: Multiple variable assignment
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@LeeNetherton, good point, though I'm not sure if one needs the return status of echo command :-) I think at the time of writing the answer bash supporting this syntax was less common (as in installed by default), though I'm not 100% sure.
– Michael Kre...
Where to define custom error types in Ruby and/or Rails?
..._name/exceptions.rb
and defined as:
module GemName
class AuthenticationError < StandardError; end
class InvalidUsername < AuthenticationError; end
end
an example of this would be something like this in httparty
For Ruby on Rails
Put them in your lib/ folder under a file called exc...
SVN Error - Not a working copy
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Maybe you just copied tree of folder and trying to add lowest one.
SVN
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subfolder1
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subfolder2 (here you get an error)
in that case you have to commit directory on the upper level.
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Delete all lines beginning with a # from a file
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This can be done with a sed one-liner:
sed '/^#/d'
This says, "find all lines that start with # and delete them, leaving everything else."
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