I have been searching for some time but not found enough answers to do this myself.
I have an MsSQL that looks like this:
select count(*) from
( select distinct supplierName, supplierNr
from dbo.InvoiceTypeBean
) as a
This returns what I want using pure SQL
But i need this in hibernate using criteria and/or detachedcriteria:
The detached criteria part:
DetachedCriteria dCriteria = DetachedCriteria.forClass(clazz);
ProjectionList p = Projections.projectionList();
p.add(Projections.property("supplierName"));
p.add(Projections.property("supplierNr"));
dCriteria.setProjection(Projections.distinct(p));
The problem is attaching it to the criteria:
Criteria criteria = session.createCriteria(clazz);
.... Some atachement
criteria.setProjection(Projections.rowCount());
int count = ((Number) criteria.uniqueResult()).intValue();
I really need the solution to use Criteria and/or DetachedCriteria as the queries are being build dynamically, and a greater solution is build using them.
Well found the solution, what I really needed was just the row count of the output when using distinct on multiple columns (could have been specified better I know).
The solution for interested:
session.beginTransaction();
Criteria criteria = session.createCriteria(clazz);
ProjectionList p = Projections.projectionList();
p.add(Projections.property("supplierName"));
p.add(Projections.property("supplierNr"));
criteria.setProjection(Projections.distinct(p));
criteria.setResultTransformer(Transformers.TO_LIST);
ScrollableResults results = criteria.scroll();
results.last();
count = results.getRowNumber() + 1;
results.close();
session.getTransaction().commit();
Where the interesting part is the scrollableresult and no use of DetachedCriteria.