hibernate的一对一映射-外键映射-双向-mysql数据库

最新推荐文章于 2021-01-19 20:54:43 发布

原创最新推荐文章于 2021-01-19 20:54:43 发布 · 756 阅读

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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 #外键关联 #双向

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本文介绍了一对一关联关系在Hibernate中的实现方式，通过外键映射的方式进行双向关联，并展示了具体的Java实体类定义和Hibernate配置文件内容。

hibernate的一对一映射-外键映射-双向-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.Table;

/**
 * 1对1 双向  外键映射
 * @author WuJieJecket
 *
 */
@Entity(name="DFSCLASS")
@Table(name="DFSCLASS")
@SuppressWarnings("serial")
public class Dfsclass implements Serializable {
	private String dfsclassname;
	
	private Dfsstudent dfst;

	/**
	 * @return the dfsclassname
	 */
	@Id
	@Column(name="DFSCLASSNAME")
	public String getDfsclassname() {
		return dfsclassname;
	}

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

	/**
	 * @return the dfst
	 */
	@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.LAZY,mappedBy="dfc")
	public Dfsstudent getDfst() {
		return dfst;
	}

	/**
	 * @param dfst the dfst to set
	 */
	public void setDfst(Dfsstudent dfst) {
		this.dfst = dfst;
	}
	
	

}

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.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

/**
 * 1对1 双向  外键映射
 * @author WuJieJecket
 *
 */
@Entity(name="DFSSTUDENT")
@Table(name="DFSSTUDENT")
@SuppressWarnings("serial")
public class Dfsstudent implements Serializable {
	private String dfsstudentname;
	
	private Dfsclass dfc;

	/**
	 * @return the dfsstudentname
	 */
	@Id
	@Column(name="DFSSTUDENTNAME")
	public String getDfsstudentname() {
		return dfsstudentname;
	}

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

	/**
	 * @return the dfc
	 */
	@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
	@JoinColumn(name="dfsclassname")
	public Dfsclass getDfc() {
		return dfc;
	}

	/**
	 * @param dfc the dfc to set
	 */
	public void setDfc(Dfsclass dfc) {
		this.dfc = dfc;
	}
	
	

}

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.dfsonetoone.Dfsclass" />
<mapping class="hibernate.dfsonetoone.Dfsstudent" />

</session-factory>

</hibernate-configuration>

测试方法

/*
	 * 1对1 双向 外键关联
	 */
	@Test
	public void testdfsOnetoone(){
		
		
		HIbernateUtil hbu=new HIbernateUtil();
		Session s=hbu.getSession();
		s.beginTransaction();
		
		Dfsstudent dst=new Dfsstudent();
		dst.setDfsstudentname("小明"+hbu.returnid());
		
		Dfsclass dc=new Dfsclass();
		dc.setDfsclassname("语文"+hbu.returnid());
		dc.setDfst(dst);
		
		s.save(dc);
		
		s.getTransaction().commit();
		s.close();
	}