[英]How to Write Simple Hibernate Criteria Subquery
如何在 Java 中将此 SQL 查询编写为 Hibernate JPA Criteria(带有限制等)?
SELECT q.* FROM queue AS q WHERE q.executed = false AND q.queued_on = (SELECT min(queued_on) FROM queue WHERE item_id = q.item_id);
我只设法像这样写了第一部分:
getBaseCriteria()
.add(Restrictions.eq("executed", false))
// Missing Second Where Filter Here
.addOrder(Order.asc("queuedOn"))
.list();
尝试为子查询创建一个单独的条件实例,并简单地添加另一个限制,如下所示:
DetachedCriteria subCriteria = DetachedCriteria.forClass(Queue.class, "sub")
.add(Restrictions.eqProperty("sub.itemId","main.itemId"))
.setProjection(Projections.projectionList().add(Projections.min("sub.queuedOn")));
session.createCriteria(Queue.class, "main")
.add(Subqueries.propertyEq("main.queuedOn", subCriteria ));
.add(Restrictions.eq("main.executed", false));
.addOrder(Order.asc("main.queuedOn"))
.list();
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