如何在Hibernate中启用二级缓存 [英] How to enable second level cache in Hibernate

问题描述

我在应用程序中需要一些pojo对象，所以我想知道如何启用二级缓存。到目前为止，默认情况下第一级缓存已启用，我也想知道第二级缓存有哪些优缺点。

这是你需要做的：

1. 设置下面的Hibernate属性：

    < property name =hibernate.cache.use_second_level_cache> true< / property> 
   < property name =hibernate.cache.provider_class> org.hibernate.cache.EhCacheProvider< / property> 
     




2. 添加 ehcache.xml文件，包含缓存配置条目：
   
   

     maxElementsInMemory =50
    eternal =true
    overflowToDisk =false
    timeToIdleSeconds =600 
    timeToLiveSeconds =600
    diskPersistent =false
    memoryStoreEvictionPolicy =LRU
    /> 
     




3. 为每个实体定义缓存类型：
   
   

     @Entity 
    @Cache（usage = CacheConcurrencyStrategy.READ_WRITE）
    public class MyEntity {
    ... 
   } 
     

I need some pojo objects across my application so I want to know how to enable Second Level Cache. Until now by default First Level cache is enabled, I would also like to know what advantages and disadvantages of Second Level cache there are.

解决方案

This is what you need to do:

1. Set the following Hibernate properties:

   <property name="hibernate.cache.use_second_level_cache">true</property>
   <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
   

2. Add an ehcache.xml file in your classpath, containing the cache configuration entries:

   <cache name="com.mycompany.MyEntity"
      maxElementsInMemory="50"
      eternal="true"
      overflowToDisk="false"
      timeToIdleSeconds="600"
      timeToLiveSeconds="600"
      diskPersistent="false"
      memoryStoreEvictionPolicy="LRU"       
   />
   

3. Define the Caching type for each entity:

   @Entity
   @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
   public class MyEntity {
           ...
   }
   

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