Hibernate使用Map实现多对多映射

数据库结构：

create   table  team2(id  varchar ( 50 )  primary   key ,name  varchar ( 50 ));
create   table  member2(id  varchar ( 50 )  primary   key ,name  varchar ( 50 ),age  varchar ( 50 ));
create   table  memberAtTeams2(member  varchar ( 50 ),team  varchar ( 50 ),teamRoles  varchar ( 50 ));

实体对象：

package  mapmanytomany;

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;
}
}


package  mapmanytomany;

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

public   class  Member  ... {
   private String id;
   private String name;
   private String teamRole;
   private Map team=new HashMap();
   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 getTeamRole() ...{
    return teamRole;
}
public void setTeamRole(String teamRole) ...{
    this.teamRole = teamRole;
}
public String getId() ...{
    return id;
}
public void setId(String id) ...{
    this.id = id;
}
public Map getTeam() ...{
    return team;
}
public void setTeam(Map team) ...{
    this.team = team;
}



}

 
映射:

 

<? 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 ="mapmanytomany" >
     < class  name ="Team"  table ="team2" >
        < id  name ="id"  column ="id" >
          < generator  class ="uuid.hex" ></ generator >
        </ id >
        < property  name ="name"  column ="name" />
        < map  name ="members"  table ="memberAtTeams2"  cascade ="save-update" >
           < key  column ="team" />
           < index  type ="string"  column ="teamRoles" />
           < many-to-many  class ="Member"  column ="member" ></ many-to-many >
        </ map >
     </ class >
</ hibernate-mapping >


<? 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 ="mapmanytomany" >
   
    
       < class  name ="Member"  table ="member2" >
        < id  name ="id"  column ="id" >
          < generator  class ="uuid.hex" ></ generator >
        </ id >
        < property  name ="name"  column ="name" />
        < property  name ="age"  column ="age" />
        < map  name ="team"  table ="memberAtTeams2"  inverse ="true" >
           < key  column ="member" />
           < index  type ="string"  column ="teamRoles" ></ index >
           < many-to-many  class ="Team"  column ="team" ></ many-to-many >
        </ 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");
        Team team2=new Team();
        team2.setName("足球队-02");
        
        Member m1=new Member();
        m1.setName("张三");
        m1.setAge("11");
        m1.getTeam().put("主力守门员", team1);
        m1.getTeam().put("候选守门员", team2);
        
        Member m2=new Member();
        m2.setName("张四");
        m2.setAge("22");
        m2.getTeam().put("主力中后卫", team1);
        m2.getTeam().put("候选中后卫", team2);
        
        team1.getMembers().put("主力守门员", m1);
        team1.getMembers().put("主力中后卫", m2);
        team2.getMembers().put("候选守门员", m1);
        team2.getMembers().put("候选中后卫", m2);

            session.save(team1);
            session.save(team2);
        t.commit();
        System.out.println("success