Hibernate Map映射的composite-element案例

 在这个案例的hbm文件中，只有一个持久话类Team，Member作为class引入，map的关系被映射到teammember表中，

 

数据库结构：

CREATE   TABLE  `team5` (
  `id`  varchar ( 50 )  NOT   NULL ,
  `name`  varchar ( 50 )  default   NULL ,
   PRIMARY   KEY   (`id`)
) ENGINE = InnoDB  DEFAULT  CHARSET = gb2312;

CREATE   TABLE  `teammembers` (
  `teamid`  varchar ( 50 )  NOT   NULL ,
  `name`  varchar ( 50 )  default   NULL ,
  `age`  varchar ( 50 )  default   NULL ,
  `teamrole`  varchar ( 50 )  default   NULL ,
) ENGINE = InnoDB  DEFAULT  CHARSET = gb2312;

持久类：

 

package  compositeelement;

import  java.util.HashMap;
import  java.util.Map;
import  java.util.Set;

public   class  Member  ... {
   private String id;
   private String name;
   private Team team;
   private String age;
public String getAge() ...{
    return age;
}
public void setAge(String age) ...{
    this.age = age;
}

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


public String getId() ...{
    return id;
}
public void setId(String id) ...{
    this.id = id;
}
public Team getTeam() ...{
    return team;
}
public void setTeam(Team team) ...{
    this.team = team;
}




}


package  compositeelement;

import  java.util.HashMap;
import  java.util.Map;

public   class  Team  ... {
   private String id;
   private String name;
   private Map members=new HashMap();
public String getId() ...{
    return id;
}
public void setId(String id) ...{
    this.id = id;
}


public Map getMembers() ...{
    return members;
}
public void setMembers(Map members) ...{
    this.members = members;
}
public String getName() ...{
    return name;
}
public void setName(String name) ...{
    this.name = name;
}
}

映射文件:

 

<? 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 ="compositeelement" >
     < import  class ="Member" />
     < class  name ="Team"  table ="team5" >
        < id  name ="id"  column ="id" >
          < generator  class ="uuid.hex" ></ generator >
        </ id >
        < property  name ="name"  column ="name" />
        < map  name ="members"  table ="teammembers"   inverse ="false"   cascade ="save-update" >
           < key  column ="teamid" />
           < index  column ="teamrole"  type ="string" ></ index >
           < composite-element  class ="Member" >
              < parent  name ="team" />
              < property  name ="name" />
              < property  name ="age" ></ property >
           </ composite-element >
        </ map >
     </ class >
</ hibernate-mapping >

测试代码：

public   static   void  main(String[] args)  ... {
        Configuration cfg=new Configuration();
        cfg.configure();
        SessionFactory sf=cfg.buildSessionFactory();
        Session session=sf.openSession();
        Transaction t=session.beginTransaction();

        Team team1=new Team();
        team1.setName("足球队-01");
    
        
        Member m1=new Member();
        m1.setName("张三");
        m1.setAge("11");

        
        Member m2=new Member();
        m2.setName("张四");
        m2.setAge("22");
        
        
        
        team1.getMembers().put("守门员", m1);
        team1.getMembers().put("中后卫", m2);


        session.save(team1);
        
        

        t.commit();
        System.out.println("success");

    }

运行结果：
Hibernate: insert into team5 (name, id) values (?, ?)
Hibernate: insert into teammembers (teamid, teamrole, name, age) values (?, ?, ?, ?)
Hibernate: insert into teammembers (teamid, teamrole, name, age) values (?, ?, ?, ?)