How to calculate age with JPA 2 criteria queries?

Question

I'm quite amazed that I could not find anything on this topic:

How do I calculate the age of a person at a given date, based on a date of birth and using only regular JPA criteria queries?

There are plenty of native SQL solutions, but I could not find a simple and elegant vendor-agnostic criteria.

Cheers!

Answer 1

There is no arithmetic operations for date operands in JPA 2.0. Also three existing date related functions in JP QL (CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP) and corresponding methods in Criteria API ( currentDate(), currentTime(), currentTimestamp() ) have nothing to do with calculations. That makes it impossible to perform calculations with dates. Just calculate in Java, as JB Nizet said.