I have a table "questions" which has fields id, version along with other fields. A question can have multiple records with the same id and different version. I need to select the question record for each question with the highest version.
My sql query is
select * from questions v1 inner join
(select id, max(version) as highest_version from
questions group by id
)as v2 on v1.id = v2.id and v1.version = v2.highest_version;
This query works from Sequel pro. But I need to run this from Java and I am using hibernate.
My Java code is:
String assertQuestionQuery = "select v1 from Question v1 inner join "
+ "(select t.id, max(t.version) as highest_version "
+ "from Question t "
+ "group by t.id) "
+ "as v2 on v1.id = v2.id and v1.version = v2.highest_version";
Query q = sourceEm.createQuery(assertQuestionQuery, Question.class);
List<Question> questionVersions = q.getResultList();
I am getting the following error:
ERROR org.hibernate.hql.internal.ast.ErrorCounter line 1:87: unexpected token: (
If I remove the parenthesis I am getting the following error:
ERROR org.hibernate.hql.internal.ast.ErrorCounter line 1:87: unexpected token: select
createQuery
用于创建JPA / HQL查询,请尝试使用createNativeQuery
。
I often use Native SQL Query as below:
@Override
public List<MyObj> findListNew() {
Session session = null;
Transaction tx = null;
List<MyObj> objects = null;
try {
session = HibernateUtil.getSessionFactory().openSession();
tx = session.beginTransaction();
// Write Native SQL here
StringBuffer SqlCommand =new StringBuffer();
SqlCommand.append("select * \n");
SqlCommand.append(" from tableA a , tableB b \n");
SqlCommand.append(" where a.tb_id = b.id; ");
// Map SQL results to your class MyObj
SQLQuery query = (SQLQuery) session.createSQLQuery(SqlCommand.toString())
.addScalar("AttributeOfMyObj",IntegerType.INSTANCE)
.setResultTransformer(Transformers.aliasToBean(MyObj.class));
objects = query.list();
tx.commit();
} catch (HibernateException e) {
} catch (Exception e) {
} finally {
if (session != null)
session.close();
}
return objects;
}
You can find more instruction & examples at Hibernate official site: https://docs.jboss.org/hibernate/orm/3.3/reference/en/html/querysql.html
Try with the following changes.
createNativeQuery(..)
instead of createQuery(..)
select v1.* from...
instead of select v1 from...
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