hibernate基础07:关联关系映射之基于外键单向一对一
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1、Java实体Bean类
package com.project.pojo; import java.io.Serializable; public class Card implements Serializable{ private int id; private String address; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } }
package com.project.pojo; import java.io.Serializable; public class Person implements Serializable{ private int id ; private String name; private String sex; private Card card; 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; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public Card getCard() { return card; } public void setCard(Card card) { this.card = card; } }
2、hbm.xml配置
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.project.pojo"> <class name="Card" table="t_card"> <id name="id" column="id" type="int"> <generator class="native"></generator> </id> <property name="address" /> </class> </hibernate-mapping>
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.project.pojo"> <class name="Person" table="t_person"> <id name="id" column="id" type="int"> <generator class="native"></generator> </id> <property name="name" /> <property name="sex" /> <many-to-one name="card" column="card_id" unique="true" /> </class> </hibernate-mapping>
3、hibernate.cfg.xml配置
<?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> <!-- 1、数据库连接信息 --> <!-- 指定数据方言 --> <property name="dialect">org.hibernate.dialect.mysqlDialect</property> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://192.168.1.59:3306/hibernate?characterEncoding=UTF8</property> <property name="connection.username">root</property> <property name="connection.password">1234</property> <!-- 2、通用配置信息 --> <!-- 打印sql语句 --> <property name="show_sql">true</property> <!-- 格式化sql语句 --> <property name="format_sql">true</property> <!-- 映射文件信息 --> <mapping resource="com/project/pojo/Card.hbm.xml" /> <mapping resource="com/project/pojo/Person.hbm.xml" /> </session-factory > </hibernate-configuration>
4、测试
package com.project.test; import org.hibernate.Session; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; import org.hibernate.tool.hbm2ddl.SchemaExport; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.project.pojo.Card; import com.project.pojo.Person; import com.project.util.HibernateUtil; public class HibernateTest { Session session = null; Transaction ts = null; @Before public void setUp(){ session = HibernateUtil.getSession(); ts = session.beginTransaction(); } @After public void tearDown(){ HibernateUtil.closeSession(); } @Test public void testCreateDB(){ Configuration cfg = new Configuration().configure(); //使得hibernate映射信息转换为数据库识别的dll语言 SchemaExport se = new SchemaExport(cfg); //第一个参数:是否打印dll语句 //第二个参数:是否将dll到数据库中执行 se.create(true, true); } @Test public void testInit(){ try { Card c1 = new Card(); c1.setAddress("xx市1区"); Card c2 = new Card(); c2.setAddress("xx市2区"); session.save(c1); session.save(c2); Person p1 = new Person(); p1.setName("张三"); p1.setSex("男"); p1.setCard(c1); Person p2 = new Person(); p2.setName("李四"); p2.setSex("男"); p2.setCard(c2); session.save(p1); session.save(p2); ts.commit(); } catch (Exception e) { e.printStackTrace(); if(ts!=null)ts.rollback(); } } @Test public void testSelect(){ Person p = (Person)session.get(Person.class, 1); System.out.println(p.getName()+" "+p.getSex()); System.out.println("---------------"); System.out.println(p.getCard().getAddress()); } }
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