Question

Hibernate - Can HQL support UNION function?

Asked by: LeanMoreTryMore

Hibernate -

Has anyone got the idea how to use UNION function in HQL?
Does Hibernate (HQL) support UNION function? If no, any suggestion and example i can reference to .

Please advise

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Asked On
2007-05-09 at 18:24:32ID22563113
Tags

union

,

hibernate

,

hql

Topic

J2EE

Participating Experts
2
Points
125
Comments
2

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Answers

 

by: objectsPosted on 2007-05-09 at 18:31:15ID: 19062239

it doesn't you'll need to use native sql

 

by: JaaxPosted on 2007-05-09 at 20:25:54ID: 19062582

Or you can execute the individual queries and add them to a HashSet, if you need to maintain unique elements (this requires overriding your equals and hashCode methods) or to a List if duplicates are allowed.

Query query1 = session.createQuery(first);
Query query2 = session.createQuery(second);

List list1 = query1.list();
List list2 = query2.list();

List nonUnique = list1.add(list2);
HashSet unique = new HashSet(nonUnique);

20120131-EE-VQP-002

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