Is it possible to add native query in hibernate for using as entity select?

Question

When a class annotated with @Entity annotaion hibernate uses queries like SELECT * FROM class_name . But for some reason it is needed to run custom select query for class. Is there a way to provide such query?

Answer 1

Yes, according to the official hibernate reference , you can do it like:

sess.createSQLQuery("SELECT * FROM CATS").addEntity(Cat.class);

or:

sess.createSQLQuery("SELECT ID, NAME, BIRTHDATE FROM CATS").addEntity(Cat.class);

Answer 2

Criteria cr = getCurrentSession().createCritiera(class_name.class) 
.setProjection(Projections.projectionList()
.add(Projections.property("id"), "id")
.add(Projections.property("name"), "name"))
.setResultTransformer(Transformers.aliasToBean(class_name.class));
List<class_name> list = cr.list();

Act as select id,name from class_name this will return List of class_name containing objects only have id and name and the rest of variables in class_name will be null (as you only selected id and name )

Answer 3

I would recommend you getHibernatTemplate() from HibernateDaoSupport. Afterwards you can call find("from Class where....") and you get back an object which you can cast to your java class easily.

ie List < User > users = (List < User > )getHibernateTemplate("from User");