hibernate的一对一映射-外键映射-双向-mysql数据库

布满荆棘的人生 2022-09-24 02:30 188阅读 0赞

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();
    	}