如何在休眠时使用HAVING COUNT(*)

时间:2011-12-22 15:02:37

标签: hibernate having-clause

我需要创建一个查询,我需要COUNT(*)HAVING COUNT(*) = x

我正在使用一个使用我在某处下载的CustomProjection类的解决方法。

这是我尝试实现的SQL:

select count(*) as y0_, this_.ensayo_id as y1_ from Repeticiones this_
inner join Lineas linea1_ on this_.linea_id=linea1_.id
where this_.pesoKGHA>0.0 and this_.nroRepeticion=1 and linea1_.id in (18,24)
group by this_.ensayo_id
having count(*) = 2

这是我使用Projection Hibernate类的代码:

critRepeticion.setProjection(Projections.projectionList()
                .add( Projections.groupProperty("ensayo") )
                .add( CustomProjections.groupByHaving("ensayo_id",Hibernate.LONG,"COUNT(ensayo_id) = "+String.valueOf(lineas.size()))
                .add( Projections.rowCount() )
                );

错误是:

!STACK 0
java.lang.NullPointerException
at org.hibernate.criterion.ProjectionList.toSqlString(ProjectionList.java:50)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getSelect(CriteriaQueryTranslator.java:310)
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:71)
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:67)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1550)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
at ar.com.cse.cseagro.controller.RepeticionController.buscarEnsayo(RepeticionController.java:101)

如果我使用CustomProjections类注释该行,则查询有效,但我没有在SQL中获得HAVING COUNT(*)过滤器...

基本上,查询尝试在主 - 详细信息模式中检索同时存在详细信息列表的所有主记录,例如,如果您希望知道“哪些发票同时具有产品A和B”。

这就是为什么如果我在IN子句中有3个项目,我需要使用HAVING COUNT = 3子句。

有任何想法或建议吗? 最好的问候,

4 个答案:

答案 0 :(得分:10)

我弄明白了这个问题。我用:

替换CusotmProjections类
.add( Projections.sqlGroupProjection("ensayo_id", groupBy , alias, types));

其中groupBy,别名和类型为:

 String groupBy = "ensayo_id" + " having " + "count(*) = " + String.valueOf(lineas.size());
 String[] alias = new String[1]; 
 Alias[0] = "ensayo_id"; 
 Type[] types = new Type[1]; 
 types[0] = Hibernate.INTEGER;

并且魔法在groupby String上。 -

答案 1 :(得分:1)

如果有人需要在grails中这样做,那就像是:

projections {
    groupProperty("id")
    sqlGroupProjection(...)
    rowCount()
}

自2.2.0以来sqlGroupProjection可用的地方

/**
 * Adds a sql projection to the criteria
 * 
 * @param sql SQL projecting
 * @param groupBy group by clause
 * @param columnAliases List of column aliases for the projected values
 * @param types List of types for the projected values
 */
protected void sqlGroupProjection(String sql, String groupBy, List<String> columnAliases, List<Type> types) {
    projectionList.add(Projections.sqlGroupProjection(sql, groupBy, columnAliases.toArray(new String[columnAliases.size()]), types.toArray(new Type[types.size()])));
}

http://grepcode.com/file/repo1.maven.org/maven2/org.grails/grails-hibernate/2.2.0/grails/orm/HibernateCriteriaBuilder.java/#267

答案 2 :(得分:1)

这是我的样本,它运行正常,可能有用:

我的SQL查询:

  

从MY_TABLE组中选择COLUMN1,sum(COLUMN2)   具有和(COLUMN2)的COLUMN1> 1000;

而标准将是:

 Criteria criteria = getCurrentSession().createCriteria(MyTable.Class);
  ProjectionList projectionList = Projections.projectionList();
  projectionList.add(Projections.property("column1"), "column1");
  projectionList.add(Projections.sqlGroupProjection("sum(column2)  sumColumn2 ", "COLUMN1 having sum(COLUMN2) > 1000" , new String[]{"sumColumn2"}, new org.hibernate.type.Type[]{StandardBasicTypes.STRING}));
  criteria.setProjection(projectionList);
  criteria.List();

答案 3 :(得分:0)

criteria.add(Restrictions.sqlRestriction(“1 = 1有计数(*)= 2”));