Question

我在我的web应用程序中使用了hibernate ehcache。我缓存了如下所示的列表。

model.put("projecttype",sessionfactory.getCurrentSession().createCriteria(TblProjectType.class).list());
         System.out.println("Fetch Count="+ stats.getEntityFetchCount());
        System.out.println("Second Level Hit Count="+ stats.getSecondLevelCacheHitCount());
        System.out.println("Second Level Miss Count="+ stats.getSecondLevelCacheMissCount());
        System.out.println("Second Level Put Count="+ stats.getSecondLevelCachePutCount());

ehcache.xml中

<cache
    name="com.uniphore.timesheet.domain.TblProjectType"
    maxElementsInMemory="1000"
    eternal="false"
    timeToIdleSeconds="300"
    timeToLiveSeconds="600"
    overflowToDisk="true" statistics="true"/>
TblProjectType table has 5 rows only.

我的输出：

--First---
Fetch Count=0
Second Level Hit Count=0
Second Level Miss Count=0
Second Level Put Count=0
--Second---
Fetch Count=0
Second Level Hit Count=0
Second Level Miss Count=0
Second Level Put Count=11
---Third--
Fetch Count=0
Second Level Hit Count=0
Second Level Miss Count=0
Second Level Put Count=22

My Ebtity Class：

 @Entity
    @Table(name="tblProjectType")
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    @Repository
    public class TblProjectType  implements java.io.Serializable {

        private static final long serialVersionUID = -1798070786993154681L;
         @Id
         @GeneratedValue
         @Column(name ="ID")
         private short id;
         @Column(name ="TypeName")
         private String typeName;
         @Column(name="CreatedDate")
         private Date createdDate;
         @Column(name="ModifiedDate")
         private Date modifiedDate;
         @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblProjectType", cascade = CascadeType.ALL)
         private Set<TblStage> tblStages = new HashSet<TblStage>(0);
         @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblProjectType", cascade = CascadeType.ALL)
         private Set<TblProject> tblProjects = new HashSet<TblProject>(0);

        //getters and setters 



    }

每次放入计数增加11.但没有其他值被更改。为什么二级缓存没有命中？

为什么每次都执行查询而不是从二级缓存中获取结果？

当我点击相同的查询时，为什么第二级会增加计数，它应该更新而不是插入？任何帮助将不胜感激!!!

Answer 1

尝试两件事。

在实体类中指定缓存区域

@Entity
@Table(name="tblProjectType")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region="yourcacheregion")
@Repository
public class TblProjectType  implements java.io.Serializable {
}

将条件查询标记为可缓存

model.put（ “项目类型”，sessionfactory.getCurrentSession（）个createCriteria（TblProjectType.class）.. setCacheable（真）.LIST（））;

我假设你有hibernate配置如下

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

如何使用hibernate ehcache缓存列表

1 个答案: