hibernate--一对一联合主键外键关联

最新推荐文章于 2019-02-28 19:23:00 发布

柏油

最新推荐文章于 2019-02-28 19:23:00 发布

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分类专栏： # hibernate

本文链接：https://blog.youkuaiyun.com/ldw201510803006/article/details/77731794

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本文通过Person和PersonID两个实体类示例，详细介绍了如何使用Java JPA注解实现联合主键的配置方法。包括@Entity注解的使用、@IdClass与@Id的配合以及@OneToOne和@JoinColumns的自定义数据库字段映射。

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annotation注解开发：

以person 和 personID为例：

Person.java:

package com.bean;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.OneToOne;

@Entity
@IdClass(value=PersonPK.class)
public class Person {
	private int id;
	private String name;
	private int age;

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	@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;
	}

}

PersonPK.java:（联合主键类）

package com.bean;

import java.io.Serializable;

public class PersonPK 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 int hashCode() {
		return this.name.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
        if(obj instanceof PersonPK){
        	PersonPK personPK = (PersonPK)obj;
        	if(this.id == personPK.id && this.name.equals(personPK.name)){
        		return true;
        	}
        }
		return false;
	}

}

PersonID.java:

package com.bean;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.OneToOne;

@Entity
public class PersonID {
	private int id;
	private String name;
	Person person;

	@Id
	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;
	}

	@OneToOne
	@JoinColumns(  //自定义数据库中字段名称
			{
				@JoinColumn(name="WifeId",referencedColumnName="id"),
				@JoinColumn(name="wifeName",referencedColumnName="name")
			}
			)
	public Person getPerson() {
		return person;
	}

	public void setPerson(Person person) {
		this.person = person;
	}

}