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Flask SQLAlchemy query, specify column names
... Your first statement is wrong. You need parentheses. So, it should read: session.query().with_entities(SomeModel.col1)
– JGFMK
Feb 9 '18 at 12:26
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Fastest check if row exists in PostgreSQL
... @DavidAldridge count(*) still means that all the rows have to be read, whereas limit 1 stops at the first record and returns
– Imraan
Dec 12 '13 at 13:36
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IPN vs PDT in Paypal
... @Tom: My implementation is: When either a PDT or an IPN comes in, read the parameters and try to process the payment. The processor A) blocks out other simultaneous processing (for that user) and B) checks to see if it's been processed already. After processing is done, with IPN you are f...
jQuery ajax error function
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@palaѕн I think you misread the deprecation notice. If you notice, the deprecation notice is talking about a deprecation of methods of jqXHR, but the use of success, error and complete in your above example are done within an object to the $.ajax m...
What does .SD stand for in data.table in R
...f life for data munging -- as of this writing, fwrite cannot automatically read Date or POSIXct columns, and conversions back and forth among character/factor/numeric are common. We can use .SD and .SDcols to batch-convert groups of such columns.
We notice that the following columns are stored as c...
How do I get the day of week given a date?
...import datetime
>>> datetime.today().strftime('%A')
'Wednesday'
Read more:
https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
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How to get child element by class name?
...ment.querySelector().
Lets assume:
'myElement' is the parent element you already have.
'sonClassName' is the class of the child you are looking for.
let child = myElement.querySelector('.sonClassName');
For more info, visit: https://developer.mozilla.org/en-US/docs/Web/API/Element/querySelector
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Can an interface extend multiple interfaces in Java?
...d test() {
}
}
Then single implementation works for both :).
Read my complete post here:
http://codeinventions.blogspot.com/2014/07/can-interface-extend-multiple.html
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Java: possible to line break in a properties file?
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A logical line holds all the data of a key-element pair, which may be spread out across several adjacent natural lines by escaping the line terminator sequence with a backslash character \.
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Can “this” ever be null in Java?
...thod is called right after the variable is being null-ified from another thread. The actual call goes through even if the variable is null, and it crashes when it tries to read an instance member :)
– Adrian Crețu
Sep 6 '16 at 15:08
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