mrhydejc/AliasToBeanNestedResultTransformer

Hibernate enhanced AliasToBeanResultTransformer that supports projecting one-to-one and many-to-one associations

AliasToBeanNestedResultTransformer

You can use this class as criteria trnsformer in Hibernate to bind associated beans to the target bean.

Usage Example:

class Person {
  private Long id;
  private String name;
  private Car car;
  // getters and setters
}

class Car {
  private Long id;
  private String color;
  // getters and setters
}

List<Person> getPeople() {
  ProjectionList projections = Projections.projectionList()
	.add(Projections.id().as("id"))
	.add(Projections.property("name").as("name"))
	.add(Projections.property("c.id").as("car.id"))
	.add(Projections.property("c.color").as("car.color"));

  Criteria criteria = getCurrentSession().createCriteria(Person.class)
    .createAlias("car", "c")
    .setProjection(projections)
    .setResultTransformer(new AliasToBeanNestedResultTransformer(Person.class));

  return (List<Person>) criteria.list();
}

// each car of Person will be populated

This is working for one-to-one and many-to-one associations (or beans).

We can develop it to include collections and multi-level nested associations.