How to map a dynamic/computed column in the annotation of persistence?

I try to use APP to map the results of a query to a class, but one of the columns returned by the query is the result of a subquery - it has no really a column associated with it.

Example:

Select a, b, c,.
case when it exists (select 1 from some_other_table where...) then 'Y' end ' n else as test_flag
of une_table
where the...

This case statement that performs a subquery to produce a result that is not actually mapped to a physical column so I

How to mark such a situation, so that roll in hibernation, or anything that fills the a property named testFlag when it loads the results of this query?

Trant says:
I try to use APP to map the results of a query to a class, but one of the columns returned by the query is the result of a subquery - it has no really a column associated with it.

Can you share the code? This seems to be the opposite of what JPA or any ORM package is intended; you would usually the ORM package produce SQL statements based on an object model and a query of high level object, but you try here to feed a sort of a pre-existing query object model. As I said - back. You may want to use executeNativeQuery?

Whenever I am confronted with a situation where a request starts to do involving the unions, subqueries, etc.. I keep the side JPA as stupid as possible. I create a view on the side of the database and that you simply map my entity to this point of view. With appropriate indexing in place which usually performs very well.

Tags: Java

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