combining #NamedQuery from JPA and #Filter from Hibernate - spring

Question

I have #NamedQuery. I want to add a lot of different filters to the query as per condition at runtime. There is another concept of #Filter in Hibernate. can this concept be a merge to have a combined result?
suppose I have
#NamedQuery(name="Users.someUsers",query="select u from Users where firstname='bob'")
suppose I want to filter the result according to some other parameter.
can I add #Filter that can do the trick?
supposed I want to an add age filer or a place filter over the existing Users.someUsers by enabling the corresponding filter on the underlying hibernate session?

Answer 1

I suppose you want to define named queries and filters at entity level and expect named queries to have filters which you defined.
I wrote a test for it:
#Entity
#Table(name = "DEPARTMENT")
#NamedQueries({#NamedQuery(name=DepartmentEntity.GET_DEPARTMENT_BY_ID, query=DepartmentEntity.GET_DEPARTMENT_BY_ID_QUERY),})
#FilterDef(name="deptFilter", parameters={#ParamDef( name="name", type="string")})
#Filters( {#Filter(name="deptFilter", condition=":name = name")})
public class DepartmentEntity implements Serializable {
static final String GET_DEPARTMENT_BY_ID_QUERY = "from DepartmentEntity d where d.id = :id";
public static final String GET_DEPARTMENT_BY_ID = "GET_DEPARTMENT_BY_ID";
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "ID", unique = true, nullable = false)
private Integer id;
#Column(name = "NAME", unique = true, nullable = false, length = 100)
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Now you can use both like this:
Session session = (Session) entityManager.getDelegate();
Filter filter = session.enableFilter("deptFilter");
filter.setParameter("name", name);
return (DepartmentEntity) session.getNamedQuery(DepartmentEntity.GET_DEPARTMENT_BY_ID)
.setParameter("id", id)
.uniqueResult();
Query generated by hibernate:
select department0_.ID as ID1_3_, department0_.NAME as NAME2_3_ from DEPARTMENT department0_ where ? = department0_.name and department0_.ID=?
You will need to add filters to session and then create named query. If this doesn't cover your use case then post example exactly what you want to acheive.

Answer 2

This is what CriteriaQuery is built for. It allows you to create queries at runtime.
Avoid using named queries for queries which you want to build at runtime based on user input.
Example
CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<EntityType> criteria = builder.createQuery(EntityType.class);
Root<EntityType> root = criteria.from(EntityType.class);
criteria.where(
builder.equal(root.get("owner"), "something")
);
// Any conditions can be added to criteria here ar runtime based on user input
List<Topic> topics = entityManager
.createQuery(criteria)
.getResultList();
Named queries are precompiled at EntityManagerFactory startup, so they add performance benefits as long as queries are static, but for dynamic queries consider using CriteriaQueries