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How to map calculated properties with JPA and Hibernate

My Java bean has a childCount property. This property is not mapped to a database column . Instead, it should be calculated by the database with a COUNT() function operating on the join of my Java bean and its children. It would be even better if this property could be calculated on demand / "laz...
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List all the files that ever existed in a Git repository

Do you have a clean way to list all the files that ever existed in specified branch? 4 Answers ...
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In PHP what does it mean by a function being binary-safe?

In PHP what does it mean by a function being binary-safe ? 3 Answers 3 ...
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Define preprocessor macro through CMake?

How do I define a preprocessor variable through CMake? 3 Answers 3 ...
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Rails nested form with has_many :through, how to edit attributes of join model?

How do you edit the attributes of a join model when using accepts_nested_attributes_for? 3 Answers ...
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How to iterate over the keys and values in an object in CoffeeScript?

I have an object (an "associate array" so to say - also known as a plain JavaScript object): 4 Answers ...
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How do I find duplicates across multiple columns?

So I want to do something like this sql code below: 7 Answers 7 ...
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Updating address bar with new URL without hash or reloading the page

I either dreamt about chrome (dev channel) implementing a way to update the address bar via javascript (the path, not domain) without reloading the page or they really have done this. ...
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Fade Effect on Link Hover?

on many sites, such as http://www.clearleft.com , you'll notice that when the links are hovered over, they will fade into a different color as opposed to immediately switching, the default action. ...
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Check if a table exists in Rails

... a website so I want to make sure they have migrated the table before they can do a rake task which will populate that respective table. ...