Hibernate 标准 api“选择”

Question

是否可以使用 hibernate Critiria api 创建“select in”查询？

例子 ： 我有两个 1:n 关系的表，公司和部门

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

Answer 1

您可以用于此 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));