[英]Hibernate Criteria Group by AND Order By
我需要将下一个查询放入条件中
SELECT DISTINCT SUBSTRING(id, 1, LENGTH(id)-3) AS id_trunc, MAX(version) as version, MAX(code) as code
FROM theTable
WHERE (version like '%.%' AND NOT version LIKE '%.0' AND event_code LIKE 'CODE1') OR (version LIKE '%.0' AND code LIKE 'CODE2')
GROUP BY id_trunc
ORDER BY id_trunc, version, code
我有使用Criteria的经验,但是仅是简单的东西,在这种情况下,我需要一种方法来进行投影,分组依据和订购依据。 我尝试了几次,但无法正常工作。 我到处看,但是找不到像这个查询那么复杂的查询。
这是我到目前为止所拥有的
Criterion whereClause = Restrictions.and(Restrictions.like("version","%.%"),
Restrictions.and(Restrictions.not(Restrictions.like("version","%.0")),Restrictions.like("code","CODE1")));
Criterion secondWhere = Restrictions.and(Restrictions.like("Version","%.0"), Restrictions.like("code","CODE2"));
LogicalExpression orWhere= Restrictions.or(whereClause,secondWhere);
criteria.add(orWhere);
您拥有限制部分的权利。
因此,要计算您的投影:
criteria.setProjection(Projections.projectionList().
add(Projections.groupProperty("SUBSTRING(id, 1, LENGTH(id)-3)", "id_trunc")).
add(Projections.max("version")).
add(Projections.max("code")))
现在要映射结果,您将需要另一个仅包含三个字段的对象和一个转换器。
criteria.setResultTransformer(Transformers.aliasToBean(TruncatedIdWithMaxVersion.class))
对于ORDER BY:
criteria.addOrder(Order.asc("id_trunc"));
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