Using sum() in hibernate criteria

Question

How can I write the sql query select sum(amount * direction) from transactions into hibernate criteria ?

Answer 1

Projections is the key word to use aggregate functions with hibnerate criteria.

roseindia has a short example for implementing a SELECT SUM(...) query. Looks pretty close to your problem.

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Here's another forum topic that includes a working example for a SUM(col1 * col2) expression and the original poster had similiar problems with exceptions before.