Hibernate使用EHCache二级缓存

数据库结构：

 

create table teamEH (id varchar(32),teamname varchar(32));
create table studentEH (id varchar(32),name varchar(32),team_id varchar(32));

POJO：

 

package EHCache;

public class Student ...{
    private String id; //标识id
    private String name; //学生姓名
    private Team team;//班级




    public String getName() ...{
        return name;
    }

   

    public void setId(String id) ...{
        this.id = id;
    }

   

    public void setName(String stuName) ...{
        this.name = stuName;
    }

  

    public String getId() ...{
        return id;
    }

    public Student() ...{ //无参的构造函数
    }

   

    public Team getTeam() ...{
        return team;
    }

    public void setTeam(Team team) ...{
        this.team = team;
    }
}




package EHCache;

import java.util.HashSet;
import java.util.Set;


public class Team ...{
    private String id;
    private Set students;
    private String teamName;
    public String getId() ...{
        return id;
    }

    public void setId(String id) ...{
        this.id = id;
    }

    public String getTeamName() ...{
        return teamName;
    }

    public void setTeamName(String name) ...{
        this.teamName = name;
    }

    public Set getStudents() ...{
        return students;
    }

    public void setStudents(Set students) ...{
        this.students = students;
    }
}

 Team.hbm.xml

其中<cache>标签表示对student集合缓存，但只缓存id,如果需要缓存student实例，则需要在student.hbm.xml中的
class标签中配置<cache>

 

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping package="EHCache" >
    <class name="EHCache.Team" table="teamEH" lazy="false">
       <id name="id" column="id">
         <generator class="uuid.hex"></generator>
       </id>
       <property name="teamName" column="teamName"></property>
       
       <set name="students" 
            lazy="true" 
            inverse="true" 
            outer-join="false"
            batch-size="2"
            cascade="save-update"
           >
           <!-- 对students集合缓存，但只是缓存student-id如果要对整个对象缓存，
                还需要在Student.hbm.xml的class标签中加入<cache>标签 -->
         <cache usage="read-write"/>
         <key column="team_id"></key>
         <one-to-many class="EHCache.Student"/>
       </set>
      </class>
</hibernate-mapping>

 

Student.hbm.xml

 

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping package="EHCache" >
   
    <class name="EHCache.Student" table="studentEH" lazy="false">
       <cache usage="read-write"/>
       <id name="id" column="id" unsaved-value="null">
         <generator class="uuid.hex"></generator>
       </id>

       <property name="name" column="name"></property>
    
       <many-to-one name="team" 
                    column="team_id"
                    outer-join="true" 
                    cascade="save-update"
                    class="EHCache.Team"></many-to-one>
      </class>
</hibernate-mapping>

 

Hibernate.cfg.xml

配置hibernate.cache.provider_class以启用EHCache

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
    <property name="connection.username">root</property>
    <property name="connection.url">
        jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312&amp;useUnicode=true
    </property>
    <property name="dialect">
        org.hibernate.dialect.MySQLDialect
    </property>
    <property name="myeclipse.connection.profile">mysql</property>
    <property name="connection.password">1234</property>
    <property name="connection.driver_class">
        com.mysql.jdbc.Driver
    </property>
    <property name="hibernate.dialect">
        org.hibernate.dialect.MySQLDialect
    </property>
    <property name="hibernate.show_sql">true</property>
    <property name="current_session_context_class">thread</property>

    <property name="hibernate.cache.provider_class">
            org.hibernate.cache.EhCacheProvider
        </property>
    <mapping resource="EHCache/Student.hbm.xml" />
    <mapping resource="EHCache/Team.hbm.xml" />

</session-factory>

</hibernate-configuration>

EHCache.xml(放在classpath下)

 

<ehcache>