hibernate manytomany

如有两个表用户（users） 和角色（role） 他们是多对多关系：
Users:

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

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

@SuppressWarnings("serial")
@Entity
public class Users implements Serializable {

	private Long id;
	private String name;
	private String password;
	private String realName;
	private String sex;
	private String phone;
	private String email;
	
	
	
	private Set<Role> roles = new HashSet<Role>();
	
	
	@Id
	@GeneratedValue
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getRealName() {
		return realName;
	}
	public void setRealName(String realName) {
		this.realName = realName;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	@ManyToMany(fetch=FetchType.EAGER)
	@JoinTable(name="usersRoles",joinColumns={@JoinColumn(name="userId",referencedColumnName="id")},inverseJoinColumns={@JoinColumn(name="roleId",referencedColumnName="id")})
	public Set<Role> getRoles() {
		return roles;
	}
	public void setRoles(Set<Role> roles) {
		this.roles = roles;
	}
	
	
	
	
	
}

 

Role:

 

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

import javax.persistence.ManyToMany;

@SuppressWarnings("serial")
@Entity
public class Role implements Serializable {

	private Long id;
	private String name;
	private String description;
	
	
	private Set<Users> users = new HashSet<Users>();
	


	@Id
	@GeneratedValue
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDescription() {
		return description;
	}
	public void setDescription(String description) {
		this.description = description;
	}
	@ManyToMany(mappedBy="roles")
	public Set<Users> getUsers() {
		return users;
	}
	public void setUsers(Set<Users> users) {
		this.users = users;
	}
	
	
	
	
	
}

  

 最终会生成三张表，如下图