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Determine if variable is defined in Python [duplicate]
...t always obvious because (1) the variable could be conditionally set, and (2) the variable could be conditionally deleted. I'm looking for something like defined() in Perl or isset() in PHP or defined? in Ruby.
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PostgreSQL: How to pass parameters from command line?
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You can use the -v construct e.g
psql -v v1=12 -v v2="'Hello World'" -v v3="'2010-11-12'"
and then refer to the variables in sql as :v1, :v2 etc
select * from table_1 where id = :v1;
Please pay attention on how we pass string/date value using two quotes " '...' "
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UILabel is not auto-shrinking text to fit label size
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Oct 16 '12 at 20:08
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How to select lines between two marker patterns which may occur multiple times with awk/sed
...ssary:
$ awk '/abc/{flag=1;next}/mno/{flag=0}flag' file
def1
ghi1
jkl1
def2
ghi2
jkl2
How does this work?
/abc/ matches lines having this text, as well as /mno/ does.
/abc/{flag=1;next} sets the flag when the text abc is found. Then, it skips the line.
/mno/{flag=0} unsets the flag when the...
How to write a foreach in SQL Server?
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352
You seem to want to use a CURSOR. Though most of the times it's best to use a set based solution...
phpunit mock method multiple calls with different arguments
...array('Query'));
$mock
->expects($this->exactly(2))
->method('Query')
->with($this->logicalOr(
$this->equalTo('select * from roles'),
$this->equalTo('select * from users')
))
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Extract a substring from a string in Ruby using a regular expression
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edited Sep 24 '18 at 16:43
Iulian Onofrei
6,77988 gold badges5252 silver badges9393 bronze badges
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Run a PHP file in a cron job using CPanel
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Xcode: Build Failed, but no error messages
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12 Answers
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