hibernate的一对一映射-主键映射-单向-mysql数据库

最新推荐文章于 2025-07-28 23:27:29 发布

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文章发表1周内为内容优化高峰期，后续会根据认知迭代继续做完善补充。

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#hibernate #一对一映射 #主键映射 #单向

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本文介绍使用Hibernate实现一对一主键映射的方法，通过示例展示了如何定义实体类及配置文件来实现主键关联。

hibernate的一对一映射-主键映射-单向-mysql数据库

import java.io.Serializable;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;
/**
 * 1对1 单向
 * 主键关联
 * @author WuJieJecket
 * alt +上/下 交换两行代码
 * ctrl+alt +上/下复制一行代码
 */
@Entity(name="DNFCLASS")
@Table(name="DNFCLASS")
@SuppressWarnings("serial")
public class Dnfclass implements Serializable {
	private String dclassname;
	private Dnfstudent dfs;
	/**
	 * @return the dclassname
	 */
	@Id
	@Column(name="DCLASSNAME")
	public String getDclassname() {
		return dclassname;
	}
	/**
	 * @param dclassname the dclassname to set
	 */
	public void setDclassname(String dclassname) {
		this.dclassname = dclassname;
	}
	/**
	 * @return the dfs
	 */
	@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
	@PrimaryKeyJoinColumn//主键依赖，就没有外键这么一说了
	public Dnfstudent getDfs() {
		return dfs;
	}
	/**
	 * @param dfs the dfs to set
	 */
	public void setDfs(Dnfstudent dfs) {
		this.dfs = dfs;
	}
	
	
	
}

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity(name="DNFSTUDENT")
@Table(name="DNFSTUDENT")
@SuppressWarnings("serial")
public class Dnfstudent implements Serializable {
	private String dstudentname;

	/**
	 * @return the dstudentname
	 */
	@Id
	@Column(name="DSTUDENTNAME")
	public String getDstudentname() {
		return dstudentname;
	}

	/**
	 * @param dstudentname the dstudentname to set
	 */
	public void setDstudentname(String dstudentname) {
		this.dstudentname = dstudentname;
	}
	
	

}

配置文件

<?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="connection.driver_class">
com.mysql.jdbc.Driver
</property>

<property name="connection.url">
jdbc:mysql://localhost:3306/test
</property>

<property name="connection.username">用户名</property>

<property name="connection.password">密码</property>

<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>

<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping class="hibernate.dnfonetoone.Dnfclass" />
<mapping class="hibernate.dnfonetoone.Dnfstudent" />

</session-factory>

</hibernate-configuration>

测试方法

/*
	 * 1对1 单向 主键关联
	 */
	@Test
	public void testnfOnetoone(){
		
		
		HIbernateUtil hbu=new HIbernateUtil();
		Session s=hbu.getSession();
		s.beginTransaction();
		
		Dnfstudent dst=new Dnfstudent();
		dst.setDstudentname("小明"+hbu.returnid());
		
		Dnfclass dc=new Dnfclass();
		dc.setDclassname("语文"+hbu.returnid());
		dc.setDfs(dst);
		
		s.save(dc);
		
		s.getTransaction().commit();
		s.close();
	}