sql - Hibernate 3.4.0：如何查询标量值

Question

我有：（MySQL 5.1）

CREATE TABLE `poh_faktury` (
  `cislo` int(10) unsigned NOT NULL PRIMARY KEY,
... 
) ENGINE=MyISAM DEFAULT CHARSET=utf8$$

@Entity
@Table(name="poh_faktury")
@NamedQueries({
  @NamedQuery(name="dalsiCisloFaktury", query="SELECT MAX(fakt.cislo) + 1 FROM Faktura AS fakt")
})

生成的查询（是的，两个）是：

select MAX(faktura0_.cislo)+1 as col_0_0_ from poh_faktury faktura0_
select MAX(faktura0_.cislo)+1 as col_0_0_ from poh_faktury faktura0_ limit 2

但是这个

    Integer res = ((Integer) this.getJpaTemplate().execute( new JpaCallback() {
        public Object doInJpa( EntityManager em ) throws PersistenceException {
            Query q = em.createNamedQuery( "dalsiCisloFaktury" );
            return q.getSingleResult();
        }
    }));

放入. null_res

当我调用 SQL 时，它应该返回 1000：

SELECT MAX(fakt.cislo) + 1 FROM poh_faktury AS fakt;

我应该如何让 Hibernate 返回正确的标量值？