1.总

• set:不允许重复、无序
• list:有序、重复
• map:key-value对形式

2.map与set标签中的element子标签映射的是原子类型（string、data、int、long...），即就是能够直接映射到数据库表字段上的类型，而one-to-many映射的则是实体类型，指的是无法映射到表的某个字段，而是要映射到整张表的类型。

3.map

（1）原子类型

public class Team{    private String id;    private String name;    private Map students = new HashMap();}

public static void main(String[] args)    {        //生成表        SchemaExport export = new SchemaExport(new Configuration().configure());        export.create(true,true);    }

Team team = new Team();                team.setName("team");                    Map map = team.getStudents();        map.put("zhangsan","sdas");        map.put("lisi","sadasd");                Session session = sf.openSession();        Transaction ts = null;        try        {            ts = session.beginTransaction();            session.save(team);            ts.commit();        }        catch(Exception ex)        {            if(null != ts)            {                ts.rollback();            }        }        finally        {            session.close();        }

（2）实体类型

public class Team{    private String id;    private String name;    private Map students = new HashMap();}

public class Student{    private String id;    private String name;    private String cardId;    private int age;    private Team team;}

public static void main(String[] args)    {        Team team = new Team();        team.setName("team1");            Student student = new Student();        student.setAge(12);        student.setName("liule");            student.setTeam(team);                team.getStudents().put("123456",student);                Session session = sf.openSession();        Transaction ts = null;        try        {            session.save(team);            ts = session.beginTransaction();            ts.commit();        }        catch(Exception ex)        {            ex.printStackTrace();            if(null != ts)            {                ts.rollback();            }        }        finally        {            session.close();        }    }

4.set

public class Team{    private String id;    private String name;    private Set students = new HashSet();}

public static void main(String[] args)    {        Team team = new Team();        team.setName("team1");                team.getStudents().add("zhangsan");                        Session session = sf.openSession();        Transaction ts = null;        try        {            session.save(team);            ts = session.beginTransaction();            ts.commit();        }        catch(Exception ex)        {            ex.printStackTrace();            if(null != ts)            {                ts.rollback();            }        }        finally        {            session.close();        }    }

5.list

public class Team{    private String id;    private String name;    private List students = new ArrayList();}

public class Student{    private String id;    private String name;    private String cardId;    private int age;    private Team team;

public static void main(String[] args)    {        Team team = new Team();        team.setName("team1");                Student student1 = new Student();        Student student2 = new Student();        Student student3 = new Student();                student1.setAge(10);        student1.setCardId("asd");        student1.setName("zhangsan");        student1.setTeam(team);                student2.setAge(11);        student2.setCardId("asdsa");        student2.setName("lisi");        student2.setTeam(team);                student3.setAge(12);        student3.setCardId("asasad");        student3.setName("wangwu");        student3.setTeam(team);                team.getStudents().add(student1);        team.getStudents().add(student2);        team.getStudents().add(student3);                            Session session = sf.openSession();        session.save(team);        Transaction ts = null;        try        {            session.save(team);            ts = session.beginTransaction();            ts.commit();        }        catch(Exception ex)        {            ex.printStackTrace();            if(null != ts)            {                ts.rollback();            }        }        finally        {            session.close();        }    }