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Correct use of flush() in JPA/Hibernate
..., but I'm not quite clear when to use it and how to use it correctly. From what I read, my understanding is that the contents of the persistence context will be synchronized with the database, i. e. issuing outstanding statements or refreshing entity data.
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Does the APNS device token ever change, once created?
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Apple's official documentation is unclear on this point. What I have observed is this: the token is invariant for a given device, application, and domain (production vs. sandbox). I believe that this must remain true in order for the system to work reliably. Consider the situati...
How to check null objects in jQuery
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what do you think about var _myDiv = $('#myDiv'); ... .... if(_myDiv.lenght) {...} produce exception.
– Nuri YILMAZ
Mar 8 '11 at 19:15
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Is there a CSS selector for the first direct child only?
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What you posted literally means "Find any divs that are inside of section divs and are the first child of their parent." The sub contains one tag that matches that description.
It is unclear to me whether you want both child...
C++ Double Address Operator? (&&)
I'm reading STL source code and I have no idea what && address operator is supposed to do. Here is a code example from stl_vector.h :
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check if directory exists and delete in one command unix
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I think this is the correct answer. it does what @remo needs, i.e. deleting a directory only if it exists and not giving an error if it doesn't. Maybe the question is not quite well put because why would you need to check the existence when this command won't care?!
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JPA getSingleResult() or null
...nsive programming. And if the record really does not exist (as opposite to what we've assumed), it is much better to have NoResultException compared to NullPointerException few lines later. Of course having two versions of getSingleResult() would be awesome, but if I have to pick up one...
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jQuery textbox change event doesn't fire until textbox loses focus?
...However, is binding to 'change' even necessary here? It's not clear to me what case that would handle that wouldn't already have been handled by the time it (change) fired.
– Madbreaks
Dec 9 '13 at 18:23
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Is there a read-only generic dictionary available in .NET?
... +1 for posting complete code and not just a link, but I'm curious, what's the point of an empty constructor in a ReadOnlyDictionary? :-)
– Samuel Neff
Feb 22 '11 at 16:36
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How to convert CharSequence to String?
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@TheOnlyAnil, does calling setText(CharSequence) not do what you need?
– Mike Samuel
May 4 '15 at 20:31
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