Hibernate criteria api 'Select in'

问题

is it possible to create a 'select in'-query with the hibernate critiria api ?

Example : I have two tables in a 1:n relation, company and department

select * from company c where c.id in (select company_id from department d 
where d.departmentname = 'HR' and d.location = 'xyz')

回答1:

You can use for this DetachedCriteria

DetachedCriteria subCriteria= DetachedCriteria.forClass(Departament.class);
     subCriteria.add(Property.forName("departmentname ").eq("HR"));
     subCriteria.add(Property.forName("location ").eq("xyz"));
     subCriteria.setProjection(Projections.property("company_id "));

DetachedCriteria criteria = DetachedCriteria.forClass(Company.class);
     criteria.add(Property.forName("id").in(subCriteria));

来源：https://stackoverflow.com/questions/4097161/hibernate-criteria-api-select-in