1.
<?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="mypack.Monkey" table="MONKEYS" >
<id name="id" type="long" column="ID">
<generator class="increment"/>
</id> <property name="name" type="string" >
<column name="NAME" length="15" />
</property> <property name="age" type="int" >
<column name="AGE" />
</property> <map name="images" table="IMAGES" lazy="true" sort="natural">
<key column="MONKEY_ID" />
<map-key column="IMAGE_NAME" type="string"/>
<element column="FILENAME" type="string" not-null="true"/>
</map> </class> </hibernate-mapping>
2.
package mypack; import java.io.Serializable;
import java.util.Map;
import java.util.TreeMap; public class Monkey implements Serializable {
private Long id;
private String name;
private int age;
private Map images=new TreeMap(); /** full constructor */
public Monkey(String name, int age,Map images) {
this.name = name;
this.age=age;
this.images = images;
} /** default constructor */
public Monkey() {
} /** minimal constructor */
public Monkey(Map images) {
this.images = images;
} public Long getId() {
return this.id;
} public void setId(Long id) {
this.id = id;
} public String getName() {
return this.name;
} public void setName(String name) {
this.name = name;
} public int getAge() {
return this.age;
} public void setAge(int age) {
this.age = age;
} public Map getImages() {
return this.images;
} public void setImages(Map images) {
this.images = images;
} }
3.
package mypack; import org.hibernate.*;
import org.hibernate.cfg.Configuration;
import java.util.*;
import java.sql.*; public class BusinessService{
public static SessionFactory sessionFactory;
static{
try{
Configuration config = new Configuration().configure();
sessionFactory = config.buildSessionFactory();
}catch(RuntimeException e){e.printStackTrace();throw e;} } public void saveMonkey(Monkey monkey){
Session session = sessionFactory.openSession();
Transaction tx = null;
List results=new ArrayList();
try {
tx = session.beginTransaction();
session.save(monkey);
tx.commit();
}catch (RuntimeException e) {
if (tx != null) {
tx.rollback();
}
throw e;
} finally {
session.close();
}
} public Monkey loadMonkey(long id){
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Monkey monkey=(Monkey)session.get(Monkey.class,new Long(id));
Hibernate.initialize(monkey.getImages());
tx.commit();
return monkey;
}catch (RuntimeException e) {
if (tx != null) {
tx.rollback();
}
throw e;
} finally {
session.close();
}
} public void test(){
Map images=new TreeMap();
images.put("image1","image1.jpg");
images.put("image4","image4.jpg");
images.put("image2","image2.jpg");
images.put("imageTwo","image2.jpg");
images.put("image5","image5.jpg"); Monkey monkey=new Monkey("Tom",21,images);
saveMonkey(monkey); monkey=loadMonkey(1);
printMonkey(monkey); } private void printMonkey(Monkey monkey){
System.out.println(monkey.getImages().getClass().getName());
Map images=monkey.getImages();
Set keys=images.keySet();
Iterator it=keys.iterator();
while(it.hasNext()){
String key=(String)it.next();
String filename=(String)images.get(key);
System.out.println(monkey.getName()+" "+key+" "+filename);
} }
public static void main(String args[]) {
new BusinessService().test();
sessionFactory.close();
}
}
4.