Hibernate Criteria - 从select中排除groupProperty [英] Hibernate Criteria - Exclude groupProperty from select

问题描述

  DetachedCriteria latestStatusSubquery = DetachedCriteria.forClass（BatchStatus.class）; 
 latestStatusSubquery.setProjection（Projections.projectionList（）
 .add（Projections.max（created），latestStatusDate）
 .add（Projections.groupProperty（batch.id）） ）
）; 
 
 DetachedCriteria batchCriteria = DetachedCriteria.forClass（BatchStatus.class）.createAlias（batch，batch）; 
 batch.add（Property.forName（created）.eq（latestStatusSubquery））; 
  

问题在于，添加groupProperty会自动将该属性添加到子查询中的select子句，而我找不到任何方法来阻止这种情况的发生。

结果当然是DB错误，因为子查询返回的值太多。

有没有人知道解决这个问题的方法？

解决方案

  DetachedCriteria子查询= DetachedCriteria.forClass（CustomerCommentsVO.class，latestComment）; 
 subquery.setProjection（Projections.max（latestComment.commentId））; 
 subquery.add（Expression.eqProperty（latestComment.prospectiveCustomer.prospectiveCustomerId，comment.prospectiveCustomer.prospectiveCustomerId））; 
 
 objCriteria = objSession.createCriteria（CustomerCommentsVO.class，comment）; 
 objCriteria.add（Subqueries.propertyEq（comment.commentId，subquery））; 
 List lstComments = objCriteria.list（）; 
  

I would like to use a hibernate criteria object as a subquery on a second criteria, like this:

    DetachedCriteria latestStatusSubquery = DetachedCriteria.forClass(BatchStatus.class);
    latestStatusSubquery.setProjection(Projections.projectionList()
            .add( Projections.max("created"), "latestStatusDate")
            .add( Projections.groupProperty("batch.id"))
    );

    DetachedCriteria batchCriteria = DetachedCriteria.forClass(BatchStatus.class).createAlias("batch", "batch");
    batch.add( Property.forName( "created" ).eq( latestStatusSubquery ) );

The problem is that adding a groupProperty automatically add that property to the select clause on the subselect query and I can't find any way to stop this from happening.

The result, of course a DB error because the subquery returns too many values.

Does anyone know a way around this?

解决方案

Try like below sample,

DetachedCriteria subquery = DetachedCriteria.forClass(CustomerCommentsVO.class, "latestComment"); 
            subquery.setProjection(Projections.max("latestComment.commentId")); 
            subquery.add(Expression.eqProperty("latestComment.prospectiveCustomer.prospectiveCustomerId", "comment.prospectiveCustomer.prospectiveCustomerId"));

 objCriteria = objSession.createCriteria(CustomerCommentsVO.class,"comment");
            objCriteria.add(Subqueries.propertyEq("comment.commentId", subquery)); 
List lstComments = objCriteria.list();

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