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How to map calculated properties with JPA and Hibernate
... id is the id of the current entity.
The following blog post is worth the read: Hibernate Derived Properties - Performance and Portability.
Without more details, I can't give a more precise answer but the above link should be helpful.
See also:
Section 5.1.22. Column and formula elements (Hiber...
Where can I learn how to write C code to speed up slow R functions? [closed]
...with the internal C API of R. This is very tedious.
From time to time, I read the R-exts or R-ints manuals. This helps. But most of the time, when I really want to find out about something, I go into the R source, and also in the source of packages written by e.g. Simon (there is usually lots to l...
What happens if i return before the end of using statement? Will the dispose be called?
...ks are not called. One example that I can remember is if the foreground thread exits while background threads are active: all threads apart from the GC are paused, meaning finally blocks are not run.
Obvious edit: they behave the same apart from the logic that lets them handle IDisposable objects,...
JPA : How to convert a native query result set to POJO class collection
...SetMapping must be placed in an entity because that's what JPA is going to read the metadata from. You cannot expect JPA to inspect your POJOs. The entity in which you place the mapping is irrelevant, perhaps the one that is more related to your POJO results. Alternatively the mapping could be expre...
Why isn't Python very good for functional programming? [closed]
...nder if the OP (with admitted limited FP background) is well-informed when reading terms like "pattern matching", "functional dictionaries", "currying", or "lazy lists".
– ThomasH
May 6 '11 at 10:32
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Python: split a list based on a condition?
...ls]
is there a more elegant way to do this?
That code is perfectly readable, and extremely clear!
# files looks like: [ ('file1.jpg', 33L, '.jpg'), ('file2.avi', 999L, '.avi'), ... ]
IMAGE_TYPES = ('.jpg','.jpeg','.gif','.bmp','.png')
images = [f for f in files if f[2].lower() in IMAGE_TYPE...
How to detect the device orientation using CSS media queries?
...of the viewport and have nothing todo with the device orientation itself.
Read more: https://dev.to/ananyaneogi/useful-css-media-query-features-o7f
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Auto-loading lib files in Rails 4
... Harding.
And to understand what does Rails exactly do about auto-loading?
read Rails autoloading — how it works, and when it doesn't by Simon Coffey.
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Enums and Constants. Which to use when?
I was doing some reading on enums and find them very similar to declaring constants. How would I know when to use a constant rather than an enum or vice versa. What are some of the advantages of using enums?
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Using a strategy pattern and a command pattern
...t undo and redo functionality
Maintain a history of commands
java.lang.Thread is one good implementation of Command pattern. You can treat Thread as invoker & class implementing Runnable as ConcreteCommonad/Receiver and run() method as Command.
Undo/Redo version of command pattern can be read...