man.java

hibernate方便的操作数据库相当不错的 请各位下载看看啊

//$Id: Man.java,v 1.3 2004/12/28 22:19:26 epbernard Exp $
package org.hibernate.test.metadata.manytomany;

import javax.ejb.Entity;
import javax.ejb.Id;
import javax.ejb.ManyToMany;
import javax.ejb.CascadeType;
import javax.ejb.AssociationTable;
import javax.ejb.Table;
import javax.ejb.JoinColumn;
import java.util.Set;
import java.io.Serializable;

/**
 * Man knowing sevezral womens
 * @author Emmanuel Bernard
 */
@Entity
public class Man implements Serializable {
	private ManPk id;
    private String carName;
	private Set<Woman> womens;

	@ManyToMany(cascade = {CascadeType.ALL}, isInverse = true)
	@AssociationTable(
			table = @Table(name="Man_Woman"),
			joinColumns = {
				@JoinColumn(name = "manIsElder", referencedColumnName = "elder"),
				@JoinColumn(name = "manLastName", referencedColumnName = "lastName"),
				@JoinColumn(name = "manFirstName", referencedColumnName = "firstName")
			},
			inverseJoinColumns = {
				@JoinColumn(name = "womanLastName", referencedColumnName = "lastName"),
				@JoinColumn(name = "womanFirstName", referencedColumnName = "firstName")
			}
	)
	public Set<Woman> getWomens() {
		return womens;
	}

	public void setWomens(Set<Woman> womens) {
		this.womens = womens;
	}

	@Id
	public ManPk getId() {
		return id;
	}

	public void setId(ManPk id) {
		this.id = id;
	}

	public String getCarName() {
		return carName;
	}

	public void setCarName(String carName) {
		this.carName = carName;
	}

	public int hashCode() {
		//a NPE can occurs, but I don't expect hashcode to be used before pk is set
		return getId().hashCode();
	}

	public boolean equals(Object obj) {
		//a NPE can occurs, but I don't expect equals to be used before pk is set
		if (obj != null && obj instanceof Man) {
			return getId().equals( ( (Man) obj).getId() );
		}
		else {
			return false;
		}
	}

}