Hibernate从HQL生成无效的SQL查询

时间:2017-05-03 11:00:36

标签: sql oracle hibernate hql

这是我需要Hibernate构建的SQL查询(在我的sql客户端工具中执行的运行速度非常快):

select  decision.decisionid from Decision decision
INNER JOIN Proceeding proceeding on decision.proceedingId=proceeding.proceedingId  
INNER JOIN IPRIGHT_PROCEEDING ipright on proceeding.proceedingId=ipright.proceedingId
where proceeding.dossierkindcode=7 and decision.creationdate>=TO_DATE('2017-04-22','YYYY-MM-DD') and decision.creationdate<=TO_DATE('2017-04-27','YYYY-MM-DD') or decision.updatedate>=TO_DATE('2017-04-22','YYYY-MM-DD') and decision.updatedate<=TO_DATE('2017-04-27','YYYY-MM-DD')

这是我写的HQL代码:

@Query( "select decision.decisionId FROM Decision decision, Proceeding proceeding, IprightProceeding iprightproceeding"
        + " INNER JOIN decision.proceeding"
        + " INNER JOIN iprightproceeding.proceeding"
        + " WHERE decision.proceeding.dossierKind = ?1"
        + " AND decision.creationDate>=?2"
        + " AND decision.creationDate<=?3"
        + " OR (decision.updatedate>=?2 AND decision.updatedate<=?3)"

这是生成的糟糕查询,需要花费很多时间甚至完全阻止服务器。

    Hibernate: select decision0_.decisionid as col_0_0_ from DECISION decision0_ 
inner join PROCEEDING proceeding3_ on decision0_.proceedingid=proceeding3_.proceedingid 
cross join PROCEEDING proceeding1_ 
cross join IPRIGHT_PROCEEDING iprightpro2_ 
inner join PROCEEDING proceeding4_ on iprightpro2_.proceedingid=proceeding4_.proceedingid 
where proceeding3_.dossierkindcode=? and decision0_.creationdate>=? and decision0_.creationdate<=? or decision0_.updatedate>=? and decision0_.updatedate<=?

如您所见,它的活动加入了同一张桌子两次!!!

你能帮我吗?

由于

1 个答案:

答案 0 :(得分:0)

首先,我认为您编写的是JPQL代码,而不是HQL,但无论如何您的查询都存在许多问题。首先,查看您的SELECT

select decision.decisionId
FROM Decision decision, Proceeding proceeding, IprightProceeding iprightproceeding

您正在这三个表之间进行交叉连接,因为实际上没有指定连接条件。您需要在JPQL的WHERE子句中限制连接。如果不这样做,它就是一个交叉连接。

在此之上,您正在对相同的表执行一系列内部联接,从而导致某些表的第二次联接。尝试以下JPQL查询,这可能不完美,但应该更接近您打算运行的内容。

select d.decisionId FROM Decision d, Proceeding p, IprightProceeding i
where d.proceeding = p and
      p.proceedingId = i and
      d.proceeding.dossierKind = ?1 and
      d.creationDate >= ?2 and
      d.creationDate <= ?3 or
      (d.updatedate >= ?2 AND d.updatedate <= ?3)

JPQL语法具有独特的风格,并且在很多方面与ANSI SQL不同。