休眠第二级缓存 - 打印结果 [英] Hibernate second level cache - print result

问题描述

我在应用程序中使用@Cache注释定义了二级缓存。我使用findById查询，如下所示：
$



$ b

  long id = 4; 
公司cmp = companyDAO.findById（id）; 
  

其中Company是我从DB获得的对象。

如何检查公司对象是来自数据库还是来自缓存？

解决方案

HitCount和/或MissCount API。href =http://docs.jboss.org/hibernate/stable/annotations/api/org/hibernate/stat/SecondLevelCacheStatistics.html =nofollow noreferrer> HitCount和/或MissCount API。

类似这样.....

  int oldMissCount = 。sessionFactory.getStatistics（）方法getSecondLevelCacheStatistics（RNAME）.getMissCount（）; 
 int oldHitCount = sessionFactory.getStatistics（）。getSecondLevelCacheStatistics（rName）.getHitCount（）; 
 
 long id = 4; 
公司cmp = companyDAO.findById（id）; 
 
 int newMissCount = sessionFactory.getStatistics（）。getSecondLevelCacheStatistics（rName）.getMissCount（）; 
 int newHitCount = sessionFactory.getStatistics（）。getSecondLevelCacheStatistics（rName）.getHitCount（）; 
 if（oldHitCount + 1 == newHitCount&& oldMissCount + 1 == newMissCount）{
 logger.debug（from DB from）; 
} else if（oldHitCount + 1 == newHitCount&& oldMissCount == newMissCount）{
 logger.debug（came from cache）; 
} 
  

I defined a second level cache in my application using @Cache annotation

I am using findById query, as the following:

  long id = 4;    
        Company cmp = companyDAO.findById(id);

Where Company is the object that I get from the DB.

How can I check if the Company object came from the DB or from the cache?

解决方案

Try HitCount and/or MissCount API.

Something like this.....

int oldMissCount = sessionFactory.getStatistics().getSecondLevelCacheStatistics(rName).getMissCount();
int oldHitCount = sessionFactory.getStatistics().getSecondLevelCacheStatistics(rName).getHitCount();

 long id = 4;    
 Company cmp = companyDAO.findById(id);

 int newMissCount = sessionFactory.getStatistics().getSecondLevelCacheStatistics(rName).getMissCount();
 int newHitCount = sessionFactory.getStatistics().getSecondLevelCacheStatistics(rName).getHitCount();
 if(oldHitCount+1 == newHitCount && oldMissCount+1 == newMissCount) {
    logger.debug("came from DB");
   }  else if(oldHitCount+1 == newHitCount && oldMissCount == newMissCount) {
    logger.debug("came from cache");
}

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