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In computer software, a data access object (DAO) is an object that provides an abstract interface to some type of database or other persistence mechanism. From Wikipedia: http://en.wikipedia.org/wiki/Data_access_object

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How much of the data preparation, transformation, and processing belongs in Repository layer?

Based on your comments, I would highly recommend you to not get fooled by so called best practices and other wizardry. Primarily you should choose a way to implement your solution in a way that helps: …
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