hibernate 的 一对一的映射 annotation

hibernate 的 一对一的映射 
数据表的关系 有主键管理 有外键关联  下面的先是外键关联
先从小实验开始

第一：建立一个两个类
package com.nnl.www;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Wife {
private int id;
private String name;
@Id
@GeneratedValue
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;
}

}

---------------------------


package com.nnl.www;

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

@Entity
public class Hunsander {
private int id;
private String name;
private Wife wife;
@Id
@GeneratedValue
public int getId() {
	return id;
}
public String getName() {
	return name;
}
@OneToOne//指定关系
@JoinColumn(name="wifeId")//指定关联外键的名称
public Wife getWife() {
	return wife;
}
public void setId(int id) {
	this.id = id;
}
public void setName(String name) {
	this.name = name;
}
public void setWife(Wife wife) {
	this.wife = wife;
}

}
然后到hibernate.cfg.xml去设置


<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password"></property>

        <!-- JDBC connection pool (use the built-in) -->
       <!--  <property name="connection.pool_size">1</property> -->

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

        <!-- Enable Hibernate's automatic session context management -->
         <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->
        <!--  <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>-->

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>

     <!-- <mapping resource="com/nnl/www/Student.hbm.xml"/> -->
     <mapping class="com.nnl.www.Hunsander"/>
      <mapping class="com.nnl.www.Wife"/>
      
    </session-factory>

</hibernate-configuration>
---------------------------
然后到Junit测试
package com.nnl.www;

import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.Test;


public class TestOneToOne {
@Test
public void testOneToOne(){
	new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);
}
}