我怎么能写JPA查询给定的SQL查询

请建议我怎么能写的JPA EntityManager，createQuery对于给定的SQL查询：我怎么能写JPA查询给定的SQL查询

select 
    sum(case when Status_2 = 'Allocated' then 1 else 0 end) as Allocated, 
    sum(case when Status_2 = 'Bench' then 1 else 0 end) as Bench 
    from userbean where Organizational_Unit = 'SIDG Java' 
    union 
select 
    sum(case when Status_2 = 'Allocated' then 1 else 0 end) as Allocated, 
    sum(case when Status_2 = 'Bench' then 1 else 0 end) as Bench 
    from userbean where Organizational_Unit = 'SIDG Microsoft'

来源

2016-11-16 Vikram SIngh

我想提供的SQL查询适合em.createQuery（答案） –

我的意思是如何可以得到JPQL查询EntityManager.createQuery（答案）...提供的SQL查询以上 –

从bean bean选择bean where bean.organiz = ：java或bean.organiz =：microsoft和bean.status_2 =：分配或bean.status_2。 =：长凳 - >这将返回给你列表的大小将是你的答案，老实说不明白你的意思 –

您可以使用原生SQL查询使用JPA：

Query q = em.createNativeQuery("select 
    sum(case when Status_2 = 'Allocated' then 1 else 0 end) as Allocated, 
    sum(case when Status_2 = 'Bench' then 1 else 0 end) as Bench 
    from userbean where Organizational_Unit = 'SIDG Java' 
    union 
select 
    sum(case when Status_2 = 'Allocated' then 1 else 0 end) as Allocated, 
    sum(case when Status_2 = 'Bench' then 1 else 0 end) as Bench 
    from userbean where Organizational_Unit = 'SIDG Microsoft'"); 

List<Object[]> result= q.getResultList(); 

// for each line retrieved 
for (Object[] currentLine : result) { 
    System.out.println("Allocated=" + currentLine[0] 
        + ", Bench=" + currentLine[1] ; 
}

无法保证，但您可以测试。

来源

2016-11-16 13:28:12 davidxxx

thnx这很有用 –

欢迎您:) – davidxxx

我怎么能写JPA查询给定的SQL查询

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