我需要创建一个查询,我需要COUNT(*)
和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,
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()])));
}
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”));