Complex Hibernate Projections

Question

I want to ask, it is possible that I create query projections and criterion for more than one level deep? I have 2 model classes:

@Entity  
@Table(name = \"p         


        

Answer 1

AFAIK it is not possible to project more than one level deep with aliastobean transformer. Your options are

• create a flattened Data Transfer Object (DTO)
• fill the resulting Person in memory yourself
• implement your own resulttransformer (similar to option 2)

option 1 looks like this:

Criteria criteria = getHandlerSession().createCriteria(Person.class)
    .createAlias("wife", "wife", JoinType.LEFT.ordinal())
    .add(Restrictions.eq("wife.age", 19)); 
    .setProjection(Projections.projectionList()
        .add(Projections.property("personID"), "personID")
        .add(Projections.property("name"), "personName")
        .add(Projections.property("wife.name"), "wifeName"));
    .setResultTransformer(Transformers.aliasToBean(PersonWifeDto.class));

return criteria.list();