Critérios de hibernação
esta pergunta é sobre o uso do Hibernato Criteria
para fazer um group by
.
Aqui está o meu SQL:
SELECT s.name, max(p.price), min(p.price)
FROM supplier s, product p
WHERE s.supplier_id = p.supplier_id
GROUP BY s.name
tentei o seguinte:
Criteria criteria = session.createCriteria(Supplier.class);
Criteria prodCrit = criteria.createCriteria("products");
ProjectionList projList = Projections.projectionList();
projList.add(Projections.max("price"));
projList.add(Projections.min("price"));
projList.add(Projections.groupProperty("name"));
prodCrit.setProjection(projList);
List list = criteria.list();
mas eu tenho o seguinte erro:
Exception in thread "main" org.hibernate.QueryException: could not resolve property: price of: com.gtc.hibernate.query.Supplier
2
Author: Nathaniel Ford, 2012-12-21
1 answers
Tente createAlias em vez de createCriteria. Irá produzir uma consulta SQL.
select
max(p1_.price) as y0_,
min(p1_.price) as y1_,
this_.name as y2_
from Supplier this_
inner join Product p1_ on this_.id=p1_.supplier_id
group by this_.name;
Critérios:
Criteria criteria = session.createCriteria(Supplier.class);
criteria.createAlias("products","p");
ProjectionList projList = Projections.projectionList();
projList.add(Projections.max("p.price"));
projList.add(Projections.min("p.price"));
projList.add(Projections.groupProperty("name"));
criteria.setProjection(projList);
List list = criteria.list();
3
Author: Manuel Quinones, 2012-12-21 21:24:49