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JPA: How to have one-to-many relation of the same Entity type
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Yes, this is possible. This is a special case of the standard bidirectional @ManyToOne/@OneToMany relationship. It is special because the entity on each end of the relationship is the same. The general case is detailed in Section 2.10.2 of the JPA 2.0 spec.
Here's a worked exa...
Printing everything except the first field with awk
...1 = ""; print $0, first; }'
You can also find the number of columns in NF and use that in a loop.
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Why does Math.floor return a double?
...seems inconsistent with the Math.Round functions, which do return int/long and handle the special cases in a different way.
– zod
May 11 '11 at 11:08
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Postgresql SELECT if string contains
...concatenated, no chance for SQL injection.
– Erwin Brandstetter
Apr 27 '14 at 10:48
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Stop execution of Ruby script
...says in the other answer, use abort to specify a failed end to the script, and exit for a successful end.
– Jrgns
Jul 1 '14 at 6:04
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What is pseudopolynomial time? How does it differ from polynomial time?
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To understand the difference between polynomial time and pseudopolynomial time, we need to start off by formalizing what "polynomial time" means.
The common intuition for polynomial time is "time O(nk) for some k." For example, select...
How does View Controller Containment work in iOS 5?
...r containers, analogous to UITabBarController , UINavigationController , and the like.
2 Answers
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Is inject the same thing as reduce in ruby?
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Yes, and it's also called fold in many other programming languages and in Mathematics. Ruby aliases a lot in order to be intuitive to programmers with different backgrounds. If you want to use #length on an Array, you can. If you ...
Can I change the size of UIActivityIndicator?
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The size is fixed by the style. It's a standardized interface element so the API doesn't like to fiddle with it.
However, you probably could do a scaling transform on it. Not sure how that would affect it visually, however.
Just from a UI design perspective, its...
Elastic search, multiple indexes vs one index and types for different data sets?
I have an application developed using the MVC pattern and I would like to index now multiple models of it, this means each model has a different data structure.
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