How to add Distinct in Hibernate Criteria

Question

In my database I have a Test table, with columns: testName, testType there are 2 different tests with the same type I.e \"SUN\", so I want only one of them for which I use

Answer 1

Try using:

criteria.setResultTransformer(DistinctRootEntityResultTransformer.INSTANCE);

It uses default hashcodes to find matches in results.

Thanks.

Answer 2

Had the same problem and ended up solving using the Group By projection and then adding in all the columns I needed. For example

Criteria query = session.createCriteria(Class.class)
    .setProjection(Projections.projectionList()
        .add(Projections.groupProperty("Col1"), "Col1")
        .add(Projections.groupProperty("Col2"), "Col2"))
    .setResultTransformer(Transformers.aliasToBean(Class.class));
List list =  query.list();