mapping Hibernate query results to custom class?

Question

Following up on a question I posted yesterday: How to populate POJO class from custom Hibernate query?

Can someone show me an example of how to code the following SQ

Answer 1

See AliasToBeanResultTransformer:

Result transformer that allows to transform a result to a user specified class which will be populated via setter methods or fields matching the alias names.

List resultWithAliasedBean = s.createCriteria(Enrolment.class)
            .createAlias("student", "st")
            .createAlias("course", "co")
            .setProjection( Projections.projectionList()
                    .add( Projections.property("co.description"), "courseDescription" )
            )
            .setResultTransformer( new AliasToBeanResultTransformer(StudentDTO.class) )
            .list();

StudentDTO dto = (StudentDTO)resultWithAliasedBean.get(0);

Your modified code:

List resultWithAliasedBean = s.createCriteria(Employee.class, "e")
    .setProjection(Projections.projectionList()
        .add(Projections.property("e.firstName"), "firstName")
        .add(Projections.property("e.lastName"), "lastName")
    )
    .setResultTransformer(new AliasToBeanResultTransformer(Results.class))
    .list();

Results dto = (Results) resultWithAliasedBean.get(0);

For native SQL queries see Hibernate documentation:

13.1.5. Returning non-managed entities

It is possible to apply a ResultTransformer to native SQL queries, allowing it to return non-managed entities.

sess.createSQLQuery("SELECT NAME, BIRTHDATE FROM CATS")
    .setResultTransformer(Transformers.aliasToBean(CatDTO.class))

This query specified:

• the SQL query string
• a result transformer The above query will return a list of CatDTO which has been instantiated and injected the values of NAME and BIRTHNAME into its corresponding properties or fields.