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How can I check if an element exists in the visible DOM?
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@csuwldcat It worked for me, at least in Chrome with document.contains(document.documentElement). document does have Node on its prototype chain, as far as I can tell (document->HTMLDocument->Document->Node)
– alex
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Difference between “read commited” and “repeatable read”
... data.
under REPEATABLE READ the second SELECT is guaranteed to display at least the rows that were returned from the first SELECT unchanged. New rows may be added by a concurrent transaction in that one minute, but the existing rows cannot be deleted nor changed.
under SERIALIZABLE reads the second...
Constructors in JavaScript objects
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@AlanKis (At least in some Javascript engines) the stack trace will in the anonymous function case not even mention Foo, while in the latter case it will know that it's Foo being called. Very helpful for debugging.
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When to use enumerateObjectsUsingBlock vs. for
...each invocation of the block with an autorelease pool (as of OS X 10.10 at least). This explains the performance difference compared to for in which doesn't do that.
– Pol
Dec 5 '14 at 19:31
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Getting the minimum of two values in SQL
... prefer selection of the not-null value which seems more correct to me, at least in my current use-case in the comparison of nullable dates.
– Nij
Feb 12 '19 at 8:25
add a com...
PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
...d tricky, so it's a dirty workaround in your case. You need to remember at least that when you pass an entity object to merge, it stops being attached to the transaction and instead a new, now-attached entity is returned. This means that if anyone has the old entity object still in their possession,...
How to make custom error pages work in ASP.NET MVC 4
..."~/ErrorPage/Oops/404" probably should be "~/ErrorPage/Oops?404" right? At least that's what worked for me. Maybe that just depends on the routing.
– Josh Sutterfield
Dec 4 '15 at 23:41
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get all keys set in memcached
...s somewhat hidden in a directory, which may not be in a standard PATH - at least on Ubuntu Xenial - here: /usr/share/memcached/scripts/
– sxc731
Jan 6 '18 at 16:05
add a comme...
NOT IN vs NOT EXISTS
...contributed to the 10 mins, but the other option taking 4 secs explains, atleast to me that NOT EXISTS is far better or at least that IN and EXISTS are not exactly the same and always worth a check before going ahead with code.
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URL rewriting with PHP
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on my system at least, that was FallbackResource /index.php (note the leading slash)
– Jack James
Jan 31 '14 at 14:46
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