hibernate - AND/OR 使用 Hibernate 中的条件谓词对 WHERE 条件进行分组

Question

我在对 WHERE 条件进行分组时遇到问题。最终，我的目标是拥有一组 AND 条件，每个条件都是 OR。例如：

SELECT *
WHERE ( foo = 1 AND bar = 2) 
OR (foo = 3 AND bar = 4)
OR (foo = 5 AND bar = 6)

下面是我用来完成此操作的代码。如您所见，我正在创建 2 个“相等”谓词，然后创建一个嵌套它们的谓词。

List<Waybill> getWaybillsByCriteriaOrderItemList(List< OrderItem > orderItems ) {
    CriteriaBuilder cb = em.getCriteriaBuilder()
    CriteriaQuery<Waybill> q = cb.createQuery( Waybill )
    Root<Waybill> waybillRoot = q.from(Waybill)
    q.select( waybillRoot )
    List<Predicate> predicates = []


    orderItems.each { OrderItem item ->
        Predicate carInit = cb.equal( cb.trim(waybillRoot.get('carInit')), item.carInit)
        Predicate carNumb = cb.equal( cb.trim(waybillRoot.get('carNumb')), item.carNum )
        Predicate thisCar = cb.or (
                cb.and( carInit ),
                cb.and( carNumb )
        )
        predicates << thisCar
    }
    q.where(predicates.toArray(new Predicate[predicates.size()]))
    TypedQuery<Waybill> tq = em.createQuery(q)
    List<Waybill> result = tq.getResultList()
    result
}

不幸的是，AND/OR 分组与我的预期完全相反。这是生成的 HQL

select generatedAlias0 from Waybill as generatedAlias0 where 
( ( trim(BOTH   from generatedAlias0.carInit)=:param0 ) or ( trim(BOTH   from generatedAlias0.carNumb)=:param1 ) ) 
and 
( ( trim(BOTH   from generatedAlias0.carInit)=:param2 ) or ( trim(BOTH   from generatedAlias0.carNumb)=:param3 ) ) 
and
( ( trim(BOTH   from generatedAlias0.carInit)=:param4 ) or ( trim(BOTH   from generatedAlias0.carNumb)=:param5 ) ) 

简单地颠倒那些 and() 和 or() 方法也没有解决我的问题。它导致一切都像这样：

 Predicate thisCar = cb.and (
     cb.or( carInit ),
     cb.or( carNumb )
 )

~~~~

select generatedAlias0 from Waybill as generatedAlias0 where 
( ( trim(BOTH   from generatedAlias0.carInit)=:param0 ) and ( trim(BOTH   from generatedAlias0.carNumb)=:param1 ) )
and
( ( trim(BOTH   from generatedAlias0.carInit)=:param2 ) and ( trim(BOTH   from generatedAlias0.carNumb)=:param3 ) )
and
( ( trim(BOTH   from generatedAlias0.carInit)=:param4 ) and ( trim(BOTH   from generatedAlias0.carNumb)=:param5 ) )

我已经尝试了所有我能想到的组合。谁能指出我做错了什么？

标签： hibernatejpacriteriapredicatecriteria-api

Answer 1

尝试改变：

Predicate thisCar = cb.or (
            cb.and( carInit ),
            cb.and( carNumb )
    );

到：

Predicate thisCar = cb.and( carInit , carNumb );

在循环之后，将or语句添加到谓词数组中：

q.where(cb.or(predicates.toArray(new Predicate[] {})));