@Target({TYPE}) @Retention(RUNTIME)

public @interface SecondaryTable {

String name();

String catalog() default "";

String schema() default "";

JoinColumn[] join() default {};

UniqueConstraint[] uniqueConstraints() default {};

}

@Target({TYPE}) @Retention(RUNTIME)

public @interface SecondaryTables {

SecondaryTable[] value() default {};

}

package com.kuaff.ejb3.secondary;

import javax.ejb.Dependent;

import javax.ejb.DependentAttribute;

import javax.ejb.Column;

import javax.ejb.Entity;

import javax.ejb.GeneratorType;

import javax.ejb.Id;

import javax.ejb.Table;

import javax.ejb.SecondaryTables;

import javax.ejb.SecondaryTable;

import javax.ejb.JoinColumn;

@Entity

@Table(name = "STUDENT")

@SecondaryTables({

@SecondaryTable(name = "GENDER", join = {@JoinColumn(name = "GENDER_ID")})

})

public class Student implements java.io.Serializable

{

    private int id;

    private Name name;

    private String grade;

    private String email;

    private String gender;

    @Id(generate = GeneratorType.AUTO)

    public int getId()

    {

        return id;

    }

    public void setId(int id)

    {

        this.id = id;

    }

    public void setName(Name name)

    {

        this.name = name;

    }

    @Dependent(

    { @DependentAttribute(name = "first", column ={ @Column(name = "FIRST") }),

      @DependentAttribute(name = "last", column ={ @Column(name = "LAST") }) })

    public Name getName()

    {

        return name;

    }

    public void setGrade(String grade)

    {

        this.grade = grade;

    }

    @Column(name = "GRADE")

    public String getGrade()

    {

        return grade;

    }

    public void setEmail(String email)

    {

        this.email = email;

    }

    @Column(name = "EMAIL")

    public String getEmail()

    {

        return email;

    }

    public void setGender(String gender)

    {

        this.gender = gender;

    }

    @Column(name = "gender", secondaryTable = "GENDER")

    public String getGender()

    {

        return gender;

    }

}

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);

        }

    }

}