@Target({METHOD, FIELD}) @Retention(RUNTIME)

public @interface OneToOne {

String targetEntity() default "";

CascadeType[] cascade() default {};

FetchType fetch() default EAGER;

boolean optional() default true;

}

package com.kuaff.ejb3.relationships;

import javax.ejb.CascadeType;

import javax.ejb.Entity;

import javax.ejb.FetchType;

import javax.ejb.GeneratorType;

import javax.ejb.Id;

import javax.ejb.JoinColumn;

import javax.ejb.OneToOne;

import javax.ejb.ManyToMany;

import javax.ejb.Table;

import javax.ejb.AssociationTable;

import java.util.ArrayList;

import java.util.Set;

import java.util.Collection;

import java.io.Serializable;

@Entity

@Table(name = "STUDENT")

public class Student implements Serializable

{

    private int id;

    private String first;

    private String last;

    private Dossier dossier;

    private Set<Teacher> teachers;

    @Id(generate = GeneratorType.AUTO)

    public int getId()

    {

       return id;

    }

    public void setId(int id)

    {

       this.id = id;

    }

    public void setFirst(String first)

    {

        this.first = first;

    }

    public String getFirst()

    {

        return first;

    }

    public void setLast(String last)

    {

        this.last = last;

    }

    public String getLast()

    {

        return last;

    }

    public void setDossier(Dossier dossier)

    {

        this.dossier = dossier;

    }

    @OneToOne(cascade = {CascadeType.ALL})

    @JoinColumn(name = "DOSSIER_ID")

    public Dossier getDossier()

    {

        return dossier;

    }

    public void setTeacher(Set<Teacher> teachers)

    {

        this.teachers = teachers;

    }

    @ManyToMany(cascade = {CascadeType.CREATE, CascadeType.MERGE}, fetch = FetchType.EAGER, isInverse = true)

    @AssociationTable(table = @Table(name = "STUDENT_TEACHER"),

        joinColumns = {@JoinColumn(name = "TEACHER_ID")},

        inverseJoinColumns = {@JoinColumn(name = "STUDENT_ID")})

    public Set<Teacher> getTeacher()

    {

        return teachers;

    }

}

package com.kuaff.ejb3.relationships;

import javax.ejb.Entity;

import javax.ejb.GeneratorType;

import javax.ejb.Id;

@Entity

public class Dossier implements java.io.Serializable

{

    private Long id;

    private String resume;

    @Id(generate = GeneratorType.AUTO)

    public Long getId()

    {

       return id;

    }

    public void setId(Long id)

    {

       this.id = id;

    }

    public void setResume(String resume)

    {

        this.resume = resume;

    }

    public String getResume()

    {

        return resume;

    }

}

package com.kuaff.ejb3.relationships;

import javax.ejb.AssociationTable;

import javax.ejb.Basic;

import javax.ejb.CascadeType;

import javax.ejb.Column;

import javax.ejb.Entity;

import javax.ejb.FetchType;

import javax.ejb.Id;

import javax.ejb.JoinColumn;

import javax.ejb.ManyToMany;

import javax.ejb.Table;

import javax.ejb.Transient;

import javax.ejb.Version;

import java.util.Set;

import javax.ejb.GeneratorType;

@Entity

public class Teacher implements java.io.Serializable

{

    private Long id;

    private String resume;

    private String name;

    private String info;

    private Set<Student> students;

    @Id(generate = GeneratorType.IDENTITY)

    public Long getId()

    {

        return id;

    }

    public void setId(Long id)

    {

        this.id = id;

    }

    public void setName(String name)

    {

        this.name = name;

    }

    public String getName()

    {

        return name;

    }

    public void setInfo(String info)

    {

        this.info = info;

    }

    public String getInfo()

    {

        return info;

    }

    public void setStudents(Set<Student> students)

    {

        this.students = students;

    }

    @ManyToMany(cascade = {CascadeType.CREATE, CascadeType.MERGE}, fetch = FetchType.EAGER)

    @AssociationTable(table = @Table(name = "STUDENT_TEACHER"),

    joinColumns = {@JoinColumn(name = "TEACHER_ID",referencedColumnName="ID")},

    inverseJoinColumns = {@JoinColumn(name = "STUDENT_ID",referencedColumnName="ID")})

    public Set<Student> getStudents()

    {

        return students;

    }

}

package com.kuaff.ejb3.relationships;

import javax.ejb.Remote;

import java.util.List;

@Remote

public interface EntityTest

{

    public void createData();

    public List findByName(String name);

}

package com.kuaff.ejb3.relationships;

import javax.ejb.EntityManager;

import javax.ejb.Inject;

import javax.ejb.Stateless;

import java.util.HashSet;

import java.util.Set;

import java.util.List;

@Stateless

public class EntityTestBean implements EntityTest

{

    private @Inject EntityManager manager;

    public void createData()

    {

        Teacher teacher1 = new Teacher();

        Teacher teacher2 = new Teacher();

        Set<Student> students1 = new HashSet<Student>();

        Set<Student> students2 = new HashSet<Student>();

        Student student1 = new Student();

        Student student2 = new Student();

        Student student3 = new Student();

        Dossier dossier1 = new Dossier();

        Dossier dossier2 = new Dossier();

        Dossier dossier3 = new Dossier();

        teacher1.setId(new Long(1));

        teacher1.setName("hushisheng");

        teacher1.setInfo("胡时胜教授，博士生导师");

        manager.create(teacher1);

        teacher2.setId(new Long(2));

        teacher2.setName("liyongchi");

        teacher2.setInfo("李永池教授，博士生导师");

        manager.create(teacher2);

        student1.setFirst("晁");

        student1.setLast("岳攀");

        dossier1.setResume("这是晁岳攀的档案");

        student1.setDossier(dossier1);

        students1.add(student1);

        student2.setFirst("赵");

        student2.setLast("志伟");

        dossier2.setResume("这是赵志伟的档案");

        student2.setDossier(dossier2);

        students1.add(student2);

        student3.setFirst("田");

        student3.setLast("明");

        dossier3.setResume("这是田明的档案");

        student3.setDossier(dossier3);

        students2.add(student3);

        teacher1.setStudents(students1);

        teacher2.setStudents(students2);

    }

    public List findByName(String name)

    {

        return manager.createQuery("from Teacher t where t.name = :name").setParameter("name", name).listResults();

    }

}

package com.kuaff.ejb3.secondary;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import java.util.List;

public class Client

{

    public static void main(String[] args) throws NamingException

    {

        InitialContext ctx = new InitialContext();

        StudentDAO dao = (StudentDAO) ctx.lookup(StudentDAO.class.getName());

        int id = dao.create("晁","岳攀","8","[email protected]","男");

        dao.create("朱","立焕","6","[email protected]","女");

        List list = dao.findAll();

        for(Object o:list)

        {

            Student s = (Student)o;

            System.out.printf("%s%s的性别:%s%n",s.getName().getFirst(),s.getName().getLast(),s.getGender());

            dao.evict(s);

        }

    }

}