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hibernate,hql与sql的缓存使用

2014-04-14 17:57 381 查看

getSessionFactory().evictQueries(); //清除缓存

1.在hibernate中createQuery执行hql查询的时候使用查询缓存：

getSession().createQuery(hql).setCacheable(true).setCacheRegion("user").list();

2.在hibernate中createSQLQuery执行sql时使用查询缓存：

getSession().createSQLQuery(sql).setResultTransformer(Transformers.aliasToBean(User.class)).setCacheable(true).setCacheRegion("user").list();

这样会报错，原因是That's because the aim of the second level cache is to (ultimately) cache entities that Hib knows about. I haven't
verified this but I'm not surprised that caching sql query doesn't work as those are not (directly) translated by hibernate into entities.

解决方法：

It's solutioned adding column's types to the query, using the method "addScalar()"

like this：

getSession().createSQLQuery(sql).addScalar("id", IntegerType.INSTANCE)
.addScalar("name",StringType.INSTANCE)
.addScalar("age",IntegerType.INSTANCE).setResultTransformer(Transformers.aliasToBean(User.class))
.setCacheable(true).setCacheRegion("user").list();
转自：http://www.360doc.com/content/14/0331/13/16589843_365170644.shtml

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