Hibernate：是否有第三级缓存？ [英] Hibernate : is there a third level of cache?

问题描述

在求职面试中，招聘人员问我休眠时有多少缓存级别？

During a job interview, a recruiter asked me about "how many cache levels are there in hibernate ?"

所以我描述了1级和2级。

So I described the level 1 and 2.

他说正确但是还有一个第三级缓存，例如缓存某些表的结果，这些表不会经常变化，如CURRENCY或COUNTRY并重新加载这些表格每个12/24 /你想要什么时间小时。

He said correct but there is also a third level cache, for example cache the result of some table that doesn't change often like "CURRENCY" or "COUNTRY" and reload these tables each "12/24/ What time you want" hours.

我搜索了一下，但我什么都没发现。那么真的有第三级缓存还是它只是某种功能，如果是，这个功能的名称是什么以及如何使用它？

I search about that, but I found nothing. So is there really a third level of cache or is it just some kind of features and if yes what's the name of this feature and how can I use it ?

更新：你认为他只是谈论query.setCacheable（true）描述这里？ mrbool.com/how-to-use-hibernate-query-cache/33439。但是我在哪里可以定义缓存查询结果的时间长度？我想它永远不会缓存。如果就是这样，我将在如何用hibernate定义setCacheable的持续时间中重命名主题。

UPDATE : You think he just talk about query.setCacheable(true) describe here ? mrbool.com/how-to-use-hibernate-query-cache/33439. But where can I define how long I put in cache the result of the query ? I suppose it doesn't cache for ever. If it's just that, i will rename the subject in "How define a duration for setCacheable with hibernate.

推荐答案

有一个<在hibernate中强>查询缓存，但我不确定它是否可以被称为第三级缓存。我还没有听说过这样的名字。无论如何，查询缓存适用于不改变的数据经常。

There is a query cache in hibernate, but I am not sure if it can be called "third level" cache. I haven't heard such a name. Anyway, the query cache would be applicable for data which does not change often.

其文档可在以下网址找到： http://docs.jboss.org/hibernate/orm/5.0/userguide/html_single/Hibernate_User_Guide.html#caching-query

Its documentation can be found at: http://docs.jboss.org/hibernate/orm/5.0/userguide/html_single/Hibernate_User_Guide.html#caching-query

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