小编emd*_*gon的帖子

我正在尝试将EHCache实现到我的工作原型中,其中我有一个javax.persistence.Entity表示我的数据库上的表(MySQL,mysql-connector-java-5.1.20.jar),它以XML形式提供给消费者.

我面临的问题是,即使EHCache将查询结果存储在内存中,Hibernate仍然会从数据库中检索数据.

我正在使用EHCache监视器查看内存中的项目数,并在缓存过期之前直接在数据库上更改数据,以了解是否实际使用了缓存数据.

我一直在寻找这个问题的复制而没有成功,所以也许我错过了一些东西(我只是想进入java世界).

我的文件

的pom.xml

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>4.3.0.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>4.1.4.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-ehcache</artifactId>
    <version>4.1.4.Final</version>
</dependency>
<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache-core</artifactId>
    <version>2.5.2</version>
</dependency>
<dependency>
    <groupId>org.terracotta</groupId>
    <artifactId>ehcache-probe</artifactId>
    <version>1.0.2</version>
</dependency>

实体类

package myPrototype.entities

import javax.persistence.Cacheable;
import javax.persistence.Entity;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlRootElement;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;

@Entity @Cacheable
@Cache(usage=CacheConcurrencyStrategy.READ_ONLY)
@Table(name = "Cars")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Cars.findAll", query = "SELECT d FROM Cars d"),
    [...]
public class Cars implements Serializable …