Java/Hibernate/Load

Load An Object By ID

/////////////////////////////////////////////////////////////////////////
import java.util.*;
import org.hibernate.*;
import org.hibernate.criterion.*;
public class SimpleRetrieveTest {
  
  
  public static void main(String[] args) {
    HibernateUtil.setup("create table EVENTS ( uid int, name VARCHAR, start_Date date, duration int, location_id int);");
    HibernateUtil.setup("create table locations ( uid int, name VARCHAR, address VARCHAR);");
    // hibernate code start
    Session session = HibernateUtil.currentSession();
    Transaction tx = session.beginTransaction();

        Location location = new Location();
        location.setName("USA");
        location.setAddress("Address");
        session.save(location);

        Event e= new Event();
        e.setId(11111L);
        e.setName("testSave");
        e.setStartDate(new Date());
        e.setLocation(location);
    session.save(e);
        Event loadedEvent = (Event)session.load(Event.class, e.getId());
        
        System.out.println(loadedEvent.getName());
        tx.rumit();
    HibernateUtil.closeSession();
    HibernateUtil.sessionFactory.close();
    // hibernate code end
  }
}

/////////////////////////////////////////////////////////////////////////

import java.util.Date;
public class Event {
  private Long id;
  private String name;
  private Date startDate;
  private int duration;
    private Location location;
  public void setId(Long id) {
    this.id = id;
  }
  
  public Long getId() {
    return id;
  }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Date getStartDate() {
        return startDate;
    }
    public void setStartDate(Date startDate) {
        this.startDate = startDate;
    }
    public int getDuration() {
        return duration;
    }
    public void setDuration(int duration) {
        this.duration = duration;
    }
    public Location getLocation() {
        return location;
    }
    public void setLocation(Location location) {
        this.location = location;
    }

}

/////////////////////////////////////////////////////////////////////////
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
    <!--
    This is a simplified version of the Event class used to
    demonstrate proxies.
    -->
    <class name="Event" table="events">
        <id name="id" column="uid" type="long" unsaved-value="null">
            <generator class="assigned"/>
        </id>
        <property name="name" type="string" length="100"/>
        <property name="startDate" column="start_date"
                  type="date"/>
        <property name="duration" type="integer"/>
        <many-to-one name="location" column="location_id"
                     class="Location"/>
    </class>
</hibernate-mapping>


/////////////////////////////////////////////////////////////////////////
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping >
    <class name="Location" table="locations" lazy="true">
        <id name="id" column="uid" type="long">
            <generator class="native"/>
        </id>
        <property name="name" type="string"/>
        <property name="address" type="string"/>
    </class>
</hibernate-mapping>

/////////////////////////////////////////////////////////////////////////
public class Location {
    private Long id;
    private String name;
    private String address;
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
}

/////////////////////////////////////////////////////////////////////////
<?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>
        <!-- Database connection settings -->
        <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:data/tutorial</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>
        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <mapping resource="Event.hbm.xml"/>
        <mapping resource="Location.hbm.xml"/>
        <mapping resource="Speaker.hbm.xml"/>
    </session-factory>
</hibernate-configuration>