学步园

package subclass.map;</p> <p>/**<br /> * 普通员工<br /> * @author wangtao<br /> *<br /> */<br /> public class Staff {<br /> private int id;<br /> private String name;</p> <p> public int getId() {<br /> return id;<br /> }<br /> public void setId(int id) {<br /> this.id = id;<br /> }<br /> public String getName() {<br /> return name;<br /> }<br /> public void setName(String name) {<br /> this.name = name;<br /> }<br /> }<br />

package subclass.map;</p> <p>/**<br /> * 正式工<br /> * @author wangtao<br /> *<br /> */<br /> public class FormalStaff extends Staff {<br /> // 正式员工有 工号<br /> private String staffId;</p> <p> public String getStaffId() {<br /> return staffId;<br /> }<br /> public void setStaffId(String staffId) {<br /> this.staffId = staffId;<br /> }</p> <p>}<br />

package subclass.map;</p> <p>/**<br /> * 临时工有<br /> * @author wangtao<br /> *<br /> */<br /> public class TempStaff extends Staff {<br /> // 临时工 - 工时<br /> private int hours;</p> <p> public int getHours() {<br /> return hours;<br /> }<br /> public void setHours(int hours) {<br /> this.hours = hours;<br /> }<br /> }<br />

<?xml version="1.0" encoding="UTF-8"?><br /> <!DOCTYPE hibernate-mapping PUBLIC<br /> "-//Hibernate/Hibernate Mapping DTD 3.0//EN"<br /> "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><br /> <hibernate-mapping package="subclass.map"><br /> <class name="Staff" table="T_subclass_staff"><br /> <id name="id"><br /> <generator class="native" /><br /> </id><br /> <property name="name" type="string" length="20"></property></p> <p> <joined-subclass name="FormalStaff" table="T_subclass_staff_Formal"><br /> <key column="formal_id"></key><br /> <property name="staffId" type="string" length="20"></property><br /> </joined-subclass></p> <p> //key 定义的列既是主键 又是外键<br /> <joined-subclass name="TempStaff" table="T_subclass_staff_Temp"><br /> <key column="temp_id"></key><br /> <property name="hours"></property><br /> </joined-subclass></p> <p> </class></p> <p></hibernate-mapping><br />

生成三张数据表

staff ： id name

formal： formal_id staffId

temp： temp_id   hours

package subclass.map.test;</p> <p>import org.hibernate.Session;<br /> import org.hibernate.SessionFactory;<br /> import org.hibernate.Transaction;<br /> import org.hibernate.cfg.Configuration;</p> <p>import subclass.map.FormalStaff;<br /> import subclass.map.Staff;<br /> import subclass.map.TempStaff;</p> <p>/**<br /> * 双向一对多<br /> * 增删改查测试<br /> * @author wangtao<br /> *<br /> */<br /> public class Test {</p> <p> static Session session;<br /> static{<br /> SessionFactory fac = new Configuration().configure().buildSessionFactory();</p> <p> session = fac.openSession();<br /> }<br /> public static void main(String[] args) {<br /> insert();<br /> }</p> <p> public static void insert(){<br /> Staff staff = new Staff();<br /> staff.setName("tao");</p> <p> FormalStaff formal = new FormalStaff();<br /> formal.setStaffId("idxxxx");</p> <p> TempStaff temp = new TempStaff();<br /> temp.setHours(20);</p> <p> Transaction tx = session.beginTransaction();<br /> tx.begin();</p> <p> session.save(staff);<br /> session.save(formal);<br /> session.save(temp);</p> <p> tx.commit();</p> <p> System.out.println("插入完成.....");</p> <p> }</p> <p>}<br />

插入完成后， 

staff 中的 记录为

1   tao

2   null

3  null

formal 中的记录为

2  idxxxxx

temp 中的记录为

3  20