hibernate一对一外键双向关联

<?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> <!-- 配置数据库连接驱动类 --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 配置数据库连接字符串 --> <property name="connection.url"><![CDATA[jdbc:mysql://localhost:3306/test111?useUnicode=true&characterEncoding=utf8]]></property> <!-- 配置数据库连接用户名 --> <property name="connection.username">root</property> <!-- 配置数据库连接密码 --> <property name="connection.password">123456</property> <!-- 配置数据库方言 --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- 配置数据库表生成策略 --> <!--<property name="hibernate.hbm2ddl.auto">update</property> --> <!-- 配置是否打印显示SQL语句 --> <property name="show_sql">true</property> <!-- 配置是否格式化显示SQL语句 --> <property name="format_sql">true</property> <!-- 配置hibernate是否自动提交事务 --> <!--<property name="hibernate.connection.autocommit">true</property> --> <!-- 配置实体类对应的映射文件 -->

<!-- 一对一双向外键关联 --> <mapping resource="com/great/entity5/People.hbm.xml"></mapping> <mapping resource="com/great/entity5/IdCard.hbm.xml"></mapping> </session-factory></hibernate-configuration>

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" ><hibernate-mapping package="com.great.entity5"> <!-- 配置实体类与数据库表的映射关系 --> <class name="People" table="people1"> <!-- 配置主键映射关系 --> <id name="id" column="id" type="int"> <!-- 配置主键生成策略 这个主键生成策略并没有什么影响 --> <generator class="native"> </generator> </id> <!-- 配置属性和表字段映射关系 一对外键一双向关联 --> <property name="pName" column="pName" type="string"></property> <many-to-one name="idCard" unique="true" cascade="all"> <column name="card_id"></column> </many-to-one> </class></hibernate-mapping>

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.great.entity5"> <class name="IdCard" table="idcard1"> <id name="card_id" column="id" type="int"> <generator class="identity"> </generator> </id> <!-- 配置属性和表字段映射关系 一对一外键双向关联 --> <property name="cardCode" column="cardCode" type="string"></property> <one-to-one name="people" class="com.great.entity5.People" cascade="all" property-ref="idCard" /> </class></hibernate-mapping>

package com.great.entity5;public class People { // 一对一外键双向关联 private int id; private String pName; private IdCard idCard; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getpName() { return pName; } public void setpName(String pName) { this.pName = pName; } public IdCard getIdCard() { return idCard; } public void setIdCard(IdCard idCard) { this.idCard = idCard; }}

package com.great.entity5;public class IdCard { // 一对一外键双向关联 private int card_id; private String cardCode; private People people; public int getCard_id() { return card_id; } public void setCard_id(int card_id) { this.card_id = card_id; } public String getCardCode() { return CardCode; } public void setCardCode(String cardCode) { CardCode = cardCode; } public People getPeople() { return people; } public void setPeople(People people) { this.people = people; }}

package com.great.test;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import org.junit.AfterClass;import org.junit.BeforeClass;import org.junit.Test;import com.great.entity5.IdCard;import com.great.entity5.People;public class TestOneToOneForeignBoth { static Session session; // 一对一外键双向关联 @BeforeClass public static void setUpBeforeClass() throws Exception { // 加载hibernate主配置文件 Configuration cfg = new Configuration().configure(); // 构建session工厂 SessionFactory sf = cfg.buildSessionFactory(); // 打开session session = sf.openSession(); } @AfterClass public static void tearDownAfterClass() throws Exception { // 关闭session，释放资源 session.close(); } // select1,通过people @Test public void testOneToOneSelect1() { People people = (People) session.get(People.class, 1); System.out.println("身份证号码：" + people.getIdCard().getCardCode()); System.out.println("姓名是：" + people.getpName()); } // select2,通过idCard @Test public void testOneToOneSelect2() { IdCard idCard = (IdCard) session.get(IdCard.class, 1); System.out.println("身份证号码：" + idCard.getCardCode()); System.out.println("姓名是：" + idCard.getPeople().getpName()); } // insert1数据,通过保存people来插入数据 @Test public void testOneToOneSave1() { Transaction ts = session.beginTransaction(); IdCard idCard = new IdCard(); idCard.setCardCode("124567891234566"); People people = new People(); people.setpName("张起灵2"); idCard.setPeople(people);// 可加可不加 people.setIdCard(idCard); session.save(people); ts.commit(); } // insert2数据,通过保存inCard来插入数据 @Test public void testOneToOneSave2() { Transaction ts = session.beginTransaction(); IdCard idCard = new IdCard(); idCard.setCardCode("124567891234566"); People people = new People(); people.setpName("张起灵2"); people.setIdCard(idCard);// 必须加，否则失败 idCard.setPeople(people); session.save(idCard); ts.commit(); } // delete1数据，删除people,级联删除inCard。发出两条查询两条删除语句 @Test public void testOneToOneDelete1() { Transaction ts = session.beginTransaction(); People people = (People) session.get(People.class, 12); session.delete(people); ts.commit(); } /* * delete2数据，通过删除idCard，级联删除people. * delete数据。发出两条查询两条删除语句，也是先删除people再删除idCard */ @Test public void testOneToOneDelete2() { Transaction ts = session.beginTransaction(); IdCard idCard = (IdCard) session.get(IdCard.class, 14); session.delete(idCard); ts.commit(); } // 更新数据1，通过people进行更新 @Test public void testOneToOneUpdate1() { Transaction ts = session.beginTransaction(); People people = (People) session.get(People.class, 11); people.setpName("张起灵1"); people.getIdCard().setCardCode("511381199612120254"); /* * session.update(people); * update和saveOrUpdate的区别在于后者在数据库中不存在此对象的情况下插入，所以效率低。 */ session.saveOrUpdate(people); ts.commit(); } // 更新数据2，通过idCard进行更新 @Test public void testOneToOneUpdate2() { Transaction ts = session.beginTransaction(); IdCard idCard = (IdCard) session.get(IdCard.class, 8); idCard.getPeople().setpName("张起灵3"); idCard.setCardCode("311381199612120254"); session.update(idCard); ts.commit(); }}