[英]Hibernate Criteria to find Duplicates
我想獲得重復的條目。 我想使用查詢作為標准,為此我使用下面的代碼。
SELECT * from A
WHERE field in (
SELECT field from A
GROUP BY field HAVING COUNT(field) > 1
);
Hibernate映射就像
@Entity
class A{
...
private String field;
...
}
如何在“字段”列中獲取具有重復的A列表?
你幾乎可以將你的查詢一對一翻譯成HQL (警告:未經測試)。
select A
from A a
where a.field in (
select ai.field
from A ai
group by ai.field -- assumes that by f you mean field
having count(a1.field) > 1
)
根據安東尼·阿西奧利的提示,我自己的回答
final Criteria searchCriteria = session.createCriteria(A.class);
...
final DetachedCriteria d1 = DetachedCriteria.forClass(A.class);
d1.setProjection(Projections.count("field"));
d1.add(Restrictions.eqProperty("field", "AA.field"));
final DetachedCriteria d2 = DetachedCriteria.forClass(A.class, "AA");
d2.setProjection(Projections.projectionList()
.add(Projections.groupProperty("field")));
d2.add(Subqueries.lt(1L, d1));
criteria.add(Property.forName("field").in(d2));
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