BillFacade.java
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package fi.insomnia.bortal.facade;
import javax.ejb.EJB;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import fi.insomnia.bortal.beans.EventBeanLocal;
import fi.insomnia.bortal.model.Bill;
import fi.insomnia.bortal.model.Bill_;
@Stateless
@LocalBean
public class BillFacade extends EventChildGenericFacade<Bill> {
private static final Logger logger = LoggerFactory.getLogger(BillFacade.class);
@PersistenceContext
private EntityManager em;
@EJB
private EventBeanLocal eventbean;
public BillFacade() {
super(Bill.class);
}
@Override
protected EntityManager getEm() {
return em;
}
// @Override
// public void create(Bill entity) {
// super.create(entity);
// userfacade.evict(entity.getUser());
//
// }
public Integer getBiggestBillNumber() {
// SELECT max(b.billNumber) from Bill b where b.event = :event
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<Integer> cq = cb.createQuery(Integer.class);
Root<Bill> root = cq.from(Bill.class);
cq.select(cb.max(root.get(Bill_.billNumber)));
cq.where(cb.equal(root.get(Bill_.event), eventbean.getCurrentEvent()));
return getSingleNullableResult(em.createQuery(cq));
}
}