public class Entity {
private boolean suspended;
private String code;
@Type(type = "org.jadira.usertype.dateandtime.joda.PersistentDateTime")
@DateTimeFormat(style = "S-")
private DateTime validFrom;
@Type(type = "org.jadira.usertype.dateandtime.joda.PersistentDateTime")
@DateTimeFormat(style = "S-")
private DateTime validTill;
}
查询的含义:“该代码在给定的有效期内是否唯一?”
如何重写此查询:
select count(o) from Entity o
where o <> :this and o.code = :code and (
(o.validFrom between :validFrom and :validTill and not o.suspended) or
(o.validTill between :validFrom and :validTill and not o.suspended) or
(:validFrom between o.validFrom and o.validTill and not o.suspended)
)
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Entity> cQuery = builder.createQuery(Entity.class);
Root<Entity> root = cQuery.from(Entity.class);
Predicate pValid1 = builder.between(root.get("ValidFrom"), validFrom, validTill);
Predicate pValid2 = builder.between(root.get("ValidTill"), validFrom, validTill);
Predicate pValid3 = builder.and(builder.lessThan(root.get("validTill"), balidFrom),builder.greaterThan(root.get("ValidFrom",validfrom)));
Predicate pSuspend = builder.not(root.get("Suspended"),true);
ExecutableQuery qFinal = em.createQuery(cQuery.select(root).where(builder.and(pSuspend,builder.or(pValid1,pvalid2,pvalid3))))
它应该这样工作。应该可以调整元数据对象,尽管我还没有这样做。
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