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Insert, on duplicate update in PostgreSQL?
...rying to prevent a natural and healthy DB behavior. I understand it better now.
– W.M.
Aug 8 '16 at 15:58
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.gitignore file, where should I put it in my xcode project?
...ory and activate it:
git config --global core.excludesfile ~/.gitignore
Now you can put whatever files are generated by your development tools into your .gitignore file.
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Control the size of points in an R scatterplot?
...mis-apply that rule then not only is your symbol size not changed, but you now have multiple parameters affecting text size (cex.axis, cex.lab, cex.main, and cex.sub--all do the same job as 'cex', only piece-wise). Code like that is difficult to maintain and extend.
– doug
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Should composer.lock be committed to version control?
...ession for your dependency management system as the dependency version has now gone back to being implicitly defined.
Also, your project should never have to be rebuilt or have its dependencies reacquired in each environment, especially prod. Your deliverable (tar, zip, phar, a directory, etc) shou...
How to rotate the background image in the container?
... to rotate the image which is placed in the button of scrollbar in Chrome. Now I have a CSS with this content:
5 Answers
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SqlAlchemy - Filtering by Relationship Attribute
...ives you filtering/sorting with "magical" strings as in Django, so you can now write something like
Patient.where(mother___phenoscore=10)
It's a lot shorter, especially for complex filters, say,
Comment.where(post___public=True, post___user___name__like='Bi%')
Hope you will enjoy this package
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How can I use pickle to save a dict?
...le
favorite_color = pickle.load(open("save.p", "rb"))
# favorite_color is now {"lion": "yellow", "kitty": "red"}
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How to read XML using XPath in Java
...ith this code:
expr.evaluate(doc, XPathConstants.STRING);
If you don't know how many URLs are in a given node, then you should rather do something like this:
XPathExpression expr = xpath.compile("/howto/topic[@name='PowerBuilder']/url");
NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants...
Why is lazy evaluation useful?
...ort (filter (< x) xs) ++ [x] ++ quickSort (filter (>= x) xs)
If we now want to find the minimum of the list, we can define
minimum ls = head (quickSort ls)
Which first sorts the list and then takes the first element of the list. However, because of lazy evaluation, only the head gets comp...
#include in .h or .c / .cpp?
... types like struct foo; or class bar; and not include the header file, but now you've increased your maintenance burden. You have to keep your forward declarations in sync with what's in the header file - it's just easier to include the header file. No, the types in stdio.h are not likely to chang...