Criteria subquery with not null
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28-10-2019 - |
Question
I want to convert the following subquery to use hibernate subquery:
getCurrentSession().createQuery("from Employee where id in (select adminId from Department where adminId is not null)")
.list();
Employee:
@ManyToOne @JoinColumn(name = "fk_department_id", nullable = true) private Department department;
Department:
@OneToMany(fetch = FetchType.EAGER) @JoinColumn(name = "fk_department_id") private Set<Employee> employees = new HashSet<Employee>(0);
Can anyone please provide me with an example of this convert, because i read some examples and i still cannot figure out how to do that.
Solution
Criteria c = session.createCriteria(Employee.class, "e");
DetachedCriteria dc = DetachedCriteria.forClass(Departemt.class, "d");
dc.add(Restrictions.isNotNull("d.adminId");
dc.setProjection(Projections.property("d.adminId"));
c.add(Subqueries.propertyIn("e.id", dc));
The setProjection
call makes the subquery return the adminId
property only instead of the whole Department
entity. The Subqueries.propertyIn
creates a restriction: the property id
of the searched employee must be in
the set of results returned by the subquery.
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