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Create PostgreSQL ROLE (user) if it doesn't exist
...@a_horse_with_no_name's answer and improved with @Gregory's comment.)
Unlike, for instance, with CREATE TABLE there is no IF NOT EXISTS clause for CREATE ROLE (up to at least pg 12). And you cannot execute dynamic DDL statements in plain SQL.
Your request to "avoid PL/pgSQL" is impossible except b...
Programmatically open new pages on Tabs
...ndow.open with a different window name will open in a new browser window like a popup, OR open in a new tab, if the user configured the browser to do so.
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Ruby on Rails production log rotation
...ls logs + logrotate
Another option is to simply configure logrotate to pick up the logs left by rails.
On Ubuntu and Debian that would be, for example, in a file called /etc/logrotate.d/rails_example_com.
/path/to/rails.example.com/tmp/log/*.log {
weekly
missingok
rotate 52
compre...
What type of hash does WordPress use?
...Press password hasher implements the Portable PHP password hashing framework, which is used in Content Management Systems like WordPress and Drupal.
They used to use MD5 in the older versions, but sadly for me, no more. You can generate hashes using this encryption scheme at http://scriptserver.ma...
How do you find the disk size of a Postgres / PostgreSQL table and its indexes
I'm coming to Postgres from Oracle and looking for a way to find the table and index size in terms of bytes/MB/GB/etc , or even better the size for all tables. In Oracle I had a nasty long query that looked at user_lobs and user_segments to give back an answer.
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foldl versus foldr behavior with infinite lists
... value afterwards
Lazy: Nothing is evaluated until the result is needed
Backwards: foldl (flip (:)) [] reverses a list.
foldr is:
Right associative: f x1 (f x2 (f x3 (f x4 ... (f xn z) ... )))
Recursive into an argument: Each iteration applies f to the next value and the result of folding the re...
Why is x86 ugly? Why is it considered inferior when compared to others? [closed]
...olved significantly several times, but hardware is required to maintain backwards compatibility with old binaries. For example, modern x86 hardware still contains support for running 16 bit code natively. Additionally, several memory-addressing models exist to allow older code to inter-operate on th...
VB.NET equivalent of C# property shorthand?
...me as String
This will be handled as your short version in C# is - I think they call it "Auto Property"
See also: Auto-Implemented Properties (Visual Basic)
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How does inheritance work for Attributes?
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Salman von Abbas
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answered Aug 6 '09 at 20:11
cmdematos.comcmdemato...
Why does a RegExp with global flag give wrong results?
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A RegExp object with the g flag keeps track of the lastIndex where a match occurred, so on subsequent matches it will start from the last used index, instead of 0. Take a look:
var query = 'Foo B';
var re = new RegExp(query, 'gi');
var result = [];
resu...