hibernate中的多对多

TbPower

package com.wxh.dto;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;

@Entity
public class TbPower {

  private int powerid;  
  private String powername;
  private Set<TbUser> users=new HashSet<TbUser>();
    
  public TbPower() {
    
  } 
  
  public TbPower(int powerid, String powername) {
    super();
    this.powerid = powerid;
    this.powername = powername;
  }


  @Id
  public int getPowerid() {
    return powerid;
  }
  public void setPowerid(int powerid) {
    this.powerid = powerid;
  }
  public String getPowername() {
    return powername;
  }
  public void setPowername(String powername) {
    this.powername = powername;
  }
  
  @ManyToMany(fetch=FetchType.LAZY,cascade={CascadeType.ALL})
  @JoinTable(name="user_power",joinColumns=@JoinColumn(name="powerid"),
  inverseJoinColumns=@JoinColumn(name="userid"))
  public Set<TbUser> getUsers() {
    return users;
  }
  public void setUsers(Set<TbUser> users) {
    this.users = users;
  }

  @Override
  public String toString() {
    return "TbPower [powerid=" + powerid + ", powername=" + powername
        + ", users=" + users + "]";
  } 
}

TbUser

package com.wxh.dto;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;

@Entity
public class TbUser {
  
  private int userid;
  private String username;
  private String password;
  
  private Set<TbPower> powers=new HashSet<TbPower>(); 
  
  public TbUser() {
  } 
  
  public TbUser(int userid, String username, String password) {
    super();
    this.userid = userid;
    this.username = username;
    this.password = password;
  }

  @Id
  public int getUserid() {
    return userid;
  }

  public void setUserid(int userid) {
    this.userid = userid;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  @ManyToMany(fetch=FetchType.LAZY,cascade={CascadeType.ALL})
  @JoinTable(name="user_power",joinColumns=@JoinColumn(name="userid"),
  inverseJoinColumns=@JoinColumn(name="powerid"))
  public Set<TbPower> getPoers() {
    return powers;
  }

  public void setPoers(Set<TbPower> powers) {
    this.powers = powers;
  } 
}

Test

package test;

import org.hibernate.Session;

import com.wxh.dto.TbPower;
import com.wxh.dto.TbUser;
import com.wxh.sessionfactory.HibernateSessionFactory;

public class Test {

  public static void main(String[] args) {
    
//    TbPower p1=new TbPower(1,"添加");
//    TbPower p2=new TbPower(2,"修改");
//    TbPower p3=new TbPower(3,"删除");
//    TbPower p4=new TbPower(4,"查询");
//    
//    TbUser u1=new TbUser(10,"张三","m233");
//    TbUser u2=new TbUser(20,"李四","m222"); 
    
    Session session=HibernateSessionFactory.getSession(); 
    session.beginTransaction();
      
//    session.save(p1);
//    session.save(p2);
//    session.save(p3);
//    session.save(p4);
//    
//    session.save(u1);
//    session.save(u2);
    
    //权限分配
//    TbUser user=session.get(TbUser.class, 20);
//    TbPower power4=session.get(TbPower.class, 4);
//    TbPower power3=session.get(TbPower.class, 3);
//    TbPower power2=session.get(TbPower.class, 2);
//    TbPower power1=session.get(TbPower.class, 1);
//    
//    user.getPoers().add(power1);
//    user.getPoers().add(power2);
//    user.getPoers().add(power3);
//    user.getPoers().add(power4);
    
    //用户权限的查询
    TbUser user=session.get(TbUser.class, 20);
    System.out.println(user.getUserid()+"=="+user.getUsername()+"=="+user.getPoers());
    
    session.getTransaction().commit();
    
  }
}

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
  <session-factory>
    <property name="hbm2ddl.auto">update</property>
  <property name="dialect">
    org.hibernate.dialect.Oracle9Dialect
  </property>
  <property name="connection.url">
    jdbc:oracle:thin:@127.0.0.1:1521:orcl
  </property>
  <property name="connection.username">hibernate</property>
  <property name="connection.password">m123</property>
  <property name="connection.driver_class">
    oracle.jdbc.driver.OracleDriver
  </property>
  <property name="myeclipse.connection.profile">oracle</property>
  <property name="show_sql">true</property>
  <property name="format_sql">true</property> 

  <mapping class="com.wxh.dto.TbPower"/>
  <mapping class="com.wxh.dto.TbUser"/>
  </session-factory>
</hibernate-configuration>