3

我正在使用CriteriaBuilder编写查询,但无法添加order by子句,因为它引发的错误消息ORDER BY 表达式必须出现在选择列表中,这是我的实体。

public class A{
  Integer aId;
  @ManyToOne
  @JoinColumn(name = "bId", nullable = false)
  B       classB;
  //setter and getter.
}

public class B{
    Integer bId;
    String name;
    //setter and getter.

}

我的查询看起来像这样。

CriteriaBuilder cb = super.getEntityManager().getCriteriaBuilder();
        CriteriaQuery<A> cq = cb.createQuery(A.class);
        Root<A> aRoot = cq.from(A.class);
        Join<A, B> joinB = aRoot.join("b", JoinType.INNER);

        cq.distinct( true );

        cq.orderBy( cb.asc( joinB.get("name") ));

        return super.getEntityManager().createQuery(cq).getResultList();

这是hibernate生成的sql。

select
    distinct a0_.aId as aId,
    a0_.bId as bId,
from
    a a0_ 
inner join
    b b2_ 
        on a0_.aId=b2_.bId 
order by
    b2_.name asc //this is where the error comes

如你看到的。B它不在select子句中。那么,我如何添加B

4

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