基于annotation的三种复合主键

方式一：

po类Teacher

package com.hibernate.demo.po;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name="teacher")
public class Teacher {
	
	private TeacherPK pk;
	
	private String title;
	private String yourWifeName;
	private Date birthDate;
	private boolean good;

	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public String getYourWifeName() {
		return yourWifeName;
	}
	public void setYourWifeName(String yourWifeName) {
		this.yourWifeName = yourWifeName;
	}
	@Temporal(TemporalType.TIME)
	public Date getBirthDate() {
		return birthDate;
	}
	public void setBirthDate(Date birthDate) {
		this.birthDate = birthDate;
	}
	public boolean isGood() {
		return good;
	}
	public void setGood(boolean good) {
		this.good = good;
	}
	@Id
	public TeacherPK getPk() {
		return pk;
	}
	public void setPk(TeacherPK pk) {
		this.pk = pk;
	}
}

 po 复合主键类TeacherPK

package com.hibernate.demo.po;

import java.io.Serializable;

import javax.persistence.Embeddable;

@Embeddable	
public class TeacherPK implements Serializable {
	
	private int id;
	private String name;

	public int getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public boolean equals(Object obj) {
		TeacherPK pk = (TeacherPK)obj;
		if(this.id==pk.getId() && this.name.equals(pk.getName())){
			return true;
		}else{
			return false;
		}
	}

	@Override
	public int hashCode() {
		return this.name.hashCode();
	}
	
}

 测试方法：

package com.hibernate.demo.po;

import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class TestTeacher {
	private static SessionFactory sf = null;
	
	@BeforeClass
	public static void beforeClass(){
		sf = new AnnotationConfiguration().configure().buildSessionFactory(); 
	}
	
	@Test
	public void testSave(){
		Session session = sf.openSession();
		session.beginTransaction();
		TeacherPK pk = new TeacherPK();
		pk.setId(1);
		pk.setName("nameStr");
		Teacher teacher = new Teacher();
		teacher.setPk(pk);
		teacher.setBirthDate(new Date());
		session.save(teacher);
		session.getTransaction().commit();
	}
	
	@AfterClass
	public static void afterClass(){
		sf.close();
	}
}

 方式二(比第一种配置简单)：

po类Teacher

package com.hibernate.demo.po;

import java.util.Date;

import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name="teacher")
public class Teacher {
	
	private TeacherPK pk;
	
	private String title;
	private String yourWifeName;
	private Date birthDate;
	private boolean good;

	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public String getYourWifeName() {
		return yourWifeName;
	}
	public void setYourWifeName(String yourWifeName) {
		this.yourWifeName = yourWifeName;
	}
	@Temporal(TemporalType.TIME)
	public Date getBirthDate() {
		return birthDate;
	}
	public void setBirthDate(Date birthDate) {
		this.birthDate = birthDate;
	}
	public boolean isGood() {
		return good;
	}
	public void setGood(boolean good) {
		this.good = good;
	}
	@EmbeddedId
	public TeacherPK getPk() {
		return pk;
	}
	public void setPk(TeacherPK pk) {
		this.pk = pk;
	}
}

 复合主键类TeacherPK

package com.hibernate.demo.po;

import java.io.Serializable;

public class TeacherPK implements Serializable {
	
	private int id;
	private String name;

	public int getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public boolean equals(Object obj) {
		TeacherPK pk = (TeacherPK)obj;
		if(this.id==pk.getId() && this.name.equals(pk.getName())){
			return true;
		}else{
			return false;
		}
	}

	@Override
	public int hashCode() {
		return this.name.hashCode();
	}
	
}

 测试代码不变。。。

方式三：

package com.hibernate.demo.po;

import java.util.Date;

import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name="teacher")
@IdClass(value=TeacherPK.class)
public class Teacher {
	
//	private TeacherPK pk;
	private int id;
	private String name;
	
	private String title;
	private String yourWifeName;
	private Date birthDate;
	private boolean good;
	@Id
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	@Id
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public String getYourWifeName() {
		return yourWifeName;
	}
	public void setYourWifeName(String yourWifeName) {
		this.yourWifeName = yourWifeName;
	}
	@Temporal(TemporalType.TIME)
	public Date getBirthDate() {
		return birthDate;
	}
	public void setBirthDate(Date birthDate) {
		this.birthDate = birthDate;
	}
	public boolean isGood() {
		return good;
	}
	public void setGood(boolean good) {
		this.good = good;
	}
//	@EmbeddedId
//	public TeacherPK getPk() {
//		return pk;
//	}
//	public void setPk(TeacherPK pk) {
//		this.pk = pk;
//	}
}

此处省略TeacherPK和测试代码。。