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What are '$$' used for in PL/pgSQL

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Rails.env vs RAILS_ENV

... | edited Jan 6 '14 at 21:40 sameers 4,22722 gold badges2727 silver badges4141 bronze badges answered...
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Explanation of JSONB introduced by PostgreSQL

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Build.scala, % and %% symbols meaning

I'm new to Play! Framework 2.1 (java version) and have no experience with scala. I don't understand what are and what does % and %% mean in Build.scala. I googled about them but couldn't find their meaning. ...
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Get the current user, within an ApiController action, without passing the userID as a parameter

... In WebApi 2 you can use RequestContext.Principal from within a method on ApiController share | improve this answer | ...
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best way to preserve numpy arrays on disk

... answered Mar 8 '12 at 15:02 JoshAdelJoshAdel 53.3k2222 gold badges125125 silver badges126126 bronze badges ...
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How do I tell git to always select my local version for conflicted merges on a specific file?

... b > dirWithCopyMerge\b.txt git add -A git commit -m "first commit with 2 directories and 2 files" [master (root-commit) 0adaf8e] first commit with 2 directories and 2 files We will introduce a "conflict" in the content of both those files in two different git branches: git checkout -b myBranc...
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Difference between var_dump,var_export & print_r

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Python concatenate text files

I have a list of 20 file names, like ['file1.txt', 'file2.txt', ...] . I want to write a Python script to concatenate these files into a new file. I could open each file by f = open(...) , read line by line by calling f.readline() , and write each line into that new file. It doesn't seem very "el...
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Is it possible to run selenium (Firefox) web driver without a GUI?

...ding our production server from Ubuntu- desktop 10.04 to Ubuntu- server 12.04. 11 Answers ...