[SXT][WY]Hibernate11 其他映射

component映射

在hibernate中,component是某个实体的逻辑组成部分，它与实体的根本区别是没有oid，
component可以成为是值对象（DDD）

采用component映射的好处：它实现了对象模型的细粒度划分，层次会更分明，复用率会更高

 

public class User {
 
 private int id;
 
 private String name;
 
 private Contact contact;

}

 

public class Contact {
 
 private String email;
 
 private String address;
 
 private String zipCode;
 
 private String contactTel;

}

 

User.hbm.xml

 

<?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>
 <class name="com.bjsxt.hibernate.User" table="t_user">
  <id name="id">
   <generator class="native"/>
  </id>
  <property name="name"/>
  <component name="contact">
   <property name="email"/>
   <property name="address"/>
   <property name="zipCode"/>
   <property name="contactTel"/>
  </component>
 </class>
</hibernate-mapping>

 

public void testSave1() {
  Session session = null;
  try {
   session = HibernateUtils.getSession();
   session.beginTransaction();
   
   User user = new User();
   user.setName("张三");
   
   Contact contact = new Contact();
   contact.setAddress("xxxxx");
   contact.setEmail("[e-mail]");
   contact.setZipCode("1111111");
   contact.setContactTel("9999999999");
   
   user.setContact(contact);
   
   session.save(user);
   session.getTransaction().commit();
  }catch(Exception e) {
   e.printStackTrace();
   session.getTransaction().rollback();
  }finally {
   HibernateUtils.closeSession(session);
  }
 } 

 

 

复合（联合）主键映射

 

通常将复合主键相关的属性，单独放到一个类中
 * 此类必须实现序列化接口
 * 覆写hashcode和equals方法

 

public class FiscalYearPeriodPK implements Serializable {

 //核算年
 private int fiscalYear;
 
 //核算月
 private int fiscalPeriod;

 

@Override
 public int hashCode() {
  final int prime = 31;
  int result = 1;
  result = prime * result + fiscalPeriod;
  result = prime * result + fiscalYear;
  return result;
 }

 @Override
 public boolean equals(Object obj) {
  if (this == obj)
   return true;
  if (obj == null)
   return false;
  if (getClass() != obj.getClass())
   return false;
  final FiscalYearPeriodPK other = (FiscalYearPeriodPK) obj;
  if (fiscalPeriod != other.fiscalPeriod)
   return false;
  if (fiscalYear != other.fiscalYear)
   return false;
  return true;
 }

 

}

 

public class FiscalYearPeriod {
 
 private FiscalYearPeriodPK fiscalYearPeriodPK;
 
 //开始日期
 private Date beginDate;
 
 //结束日期
 private Date endDate;
 
 //状态
 private String periodSts;

 

}

 

<?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>
 <class name="com.bjsxt.hibernate.FiscalYearPeriod" table="t_fiscal_year_period">
  <composite-id name="fiscalYearPeriodPK">
   <key-property name="fiscalYear"/>
   <key-property name="fiscalPeriod"/> 
  </composite-id>
  <property name="beginDate"/>
  <property name="endDate"/>
  <property name="periodSts"/>
 </class>
</hibernate-mapping>

 

public void testSave1() {
  Session session = null;
  try {
   session = HibernateUtils.getSession();
   session.beginTransaction();
   
   FiscalYearPeriod fiscalYearPeriod = new FiscalYearPeriod();

   FiscalYearPeriodPK pk = new FiscalYearPeriodPK();
   pk.setFiscalYear(2008);
   pk.setFiscalPeriod(8);
   
   fiscalYearPeriod.setFiscalYearPeriodPK(pk);
   
   fiscalYearPeriod.setBeginDate(new Date());
   fiscalYearPeriod.setEndDate(new Date());
   fiscalYearPeriod.setPeriodSts("Y");
   
   session.save(fiscalYearPeriod);
   session.getTransaction().commit();
  }catch(Exception e) {
   e.printStackTrace();
   session.getTransaction().rollback();
  }finally {
   HibernateUtils.closeSession(session);
  }
 }  
 
 public void testLoad1() {
  Session session = null;
  try {
   session = HibernateUtils.getSession();
   session.beginTransaction();
   
   FiscalYearPeriodPK pk = new FiscalYearPeriodPK();
   pk.setFiscalYear(2008);
   pk.setFiscalPeriod(8);
   
   FiscalYearPeriod fiscalYearPeriod = (FiscalYearPeriod)session.load(FiscalYearPeriod.class, pk);
   
   System.out.println(fiscalYearPeriod.getPeriodSts());
   
   session.getTransaction().commit();
  }catch(Exception e) {
   e.printStackTrace();
   session.getTransaction().rollback();
  }finally {
   HibernateUtils.closeSession(session);
  }
 }