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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...and re-try where necessary.
Some attempted solutions also fail to consider SELECT races. If you try the obvious and simple:
-- THIS IS WRONG. DO NOT COPY IT. It's an EXAMPLE.
BEGIN;
UPDATE testtable
SET somedata = 'blah'
WHERE id = 2;
-- Remember, this is WRONG. Do NOT COPY IT.
INSERT INTO testt...
Is there a way to select sibling nodes?
For some performance reasons, I am trying to find a way to select only sibling nodes of the selected node.
13 Answers
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Selectively revert or checkout changes to a file in Git?
... @Jan Do other version control systems' revert command allow you to select which changes within a file are reverted? Genuinely asking, as I only have experience with CVS and Git. In Git, git checkout -- path/to/file is a single command that reverts all changes in that file, but this is not th...
phpinfo() - is there an easy way for seeing it?
... My webhost (debian 7): php -r 'phpinfo();' Error in argument 1, char 2: option not found r php -v PHP 4.4.9 (cgi-fcgi) (built: Feb 28 2017 11:31:58)
– Prisoner 13
Sep 27 '17 at 8:22
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How do I search within an array of hashes by hash values in ruby?
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You're looking for Enumerable#select (also called find_all):
@fathers.select {|father| father["age"] > 35 }
# => [ { "age" => 40, "father" => "Bob" },
# { "age" => 50, "father" => "Batman" } ]
Per the documentation, it "returns a...
Converting String to Int with Swift
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Can i ask why i am getting an error when i omit the '?' char? Why do i need to state 'a' as an optional?
– Manos Serifios
Jun 2 '16 at 20:16
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Unable to export Apple production push SSL certificate in .p12 format
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Turns out all you have to do is select "My Certificates" on the left panel and it enables the .p12 option.
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Force CloudFront distribution/file update
...Click on Blank Function (custom)
Step 3
Click on empty (stroked) box and select S3 from combo
Step 4
Select your Bucket (same as for CloudFront distribution)
Step 5
Set an Event Type to "Object Created (All)"
Step 6
Set Prefix and Suffix or leave it empty if you don't know what it is.
Step ...
How to open a specific port such as 9090 in Google Compute Engine
...hoose "Firewalls rules"
Choose "Create Firewall Rule"
To apply the rule to select VM instances, select Targets > "Specified target tags", and enter into "Target tags" the name of the tag. This tag will be used to apply the new firewall rule onto whichever instance you'd like. Then, make sure the ...
Where is array's length property defined?
...he StringBuffer class itself does, yes - because it holds a reference to a char[] (or did, at least; I don't know whether it still does, off-hand). So while a StringBuilder is responsible for more memory, its immediate size and layout are fixed.
– Jon Skeet
Sep...