Hibernate: limit query with one-to-many

Question

For example, I have the Service entity:

@OneToMany(fetch = FetchType.EAGER, mappedBy = \"service\")
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Answer 1

I solved the problem using @Filter:

@FilterDef(name = "dateFilter", parameters = {
        @ParamDef(name = "date1", type = "date"),
        @ParamDef(name = "date2", type = "date") })
@Filter(name = "dateFilter", condition = "date >= :date1 and date <= :date2")

and applying it to session:

session.enableFilter("dateFilter")
                .setParameter("date1", date1)
                .setParameter("date2", date2);

BTW, when working with Hibernate, what should I use for queries: it's own mechanism or "raw" SQL like "inner join" in this case?

Answer 2

You can use Restrictions.le("date2",date2) and Restrictions.gt("date1",date1) while querying. see this link.

http://www.mkyong.com/hibernate/hibernate-criteria-examples/

following is also very useful

http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/querycriteria.html

Answer 3

You can use HQL to create query for this case.

http://www.mkyong.com/hibernate/hibernate-query-examples-hql/

Answer 4

Criteria criteria = session.createCriteria(Service.class);
if(date1!=null){
    criteria.add(Expression.ge("serviceStatuses.date1",date1));
}
if(date2!=null){
    criteria.add(Expression.le("serviceStatuses.date2",date2));
}
return criteria.list();

got it?

Answer 5

You can make use of @Where clause:

@OneToMany(fetch = FetchType.EAGER, mappedBy = "service")
@Where(clause = "is_deleted = 'N'")
List<ServiceStatus> serviceStatuses = new ArrayList<ServiceStatus>();

The above implementation allows you to filter records which are is_deleted = N. Similarly you can write your own implementation.