Java Tutorial/Hibernate/Many to One mapping

Many to One mapping

File: Main.java

   <source lang="java">

import java.util.HashSet; import org.hibernate.Session; public class Main {

 public static void main(String[] args) throws Exception {
   HibernateUtil hibernateUtil = new HibernateUtil();
   hibernateUtil
       .executeSQLCommand("create table speakers (uid int, firstName varchar,lastName varchar, event_id int);");
   hibernateUtil
       .executeSQLCommand("create table locations (uid int, name varchar, address varchar,  event_id int);");
   hibernateUtil
       .executeSQLCommand("create table attendees (uid int, firstName varchar, lastName varchar,  event_id int);");
   hibernateUtil
       .executeSQLCommand("create table events (uid int , name varchar, start_date date, duration integer,location_id int);");
   Session session = hibernateUtil.getSession();
   Event e = new Event();
   e.setName("testSave");
   Location l = new Location();
   l.setName("building 1");
   e.setLocation(l);
   e.setSpeakers(new HashSet());
   e.getSpeakers().add(new Speaker("John", "Doe"));
   e.setAttendees(new HashSet());
   e.getAttendees().add(new Attendee("John", "Smith"));
   //session.save(l);
   session.save(e);
 //  session.flush();
   
   session.close();
   hibernateUtil.checkData("select * from events");
   hibernateUtil.checkData("select * from speakers");
   hibernateUtil.checkData("select * from locations");
   hibernateUtil.checkData("select * from attendees");
 }

}</source>

Many To One Mapping: cascade all and set collection

File: Main.java

   <source lang="java">

import java.util.HashSet; import org.hibernate.Session; public class Main {

 public static void main(String[] args) throws Exception {
   HibernateUtil hibernateUtil = new HibernateUtil();
   hibernateUtil
       .executeSQLCommand("create table speakers (uid int, firstName varchar,lastName varchar, event_id int);");
   hibernateUtil
       .executeSQLCommand("create table locations (uid int, name varchar, address varchar,  event_id int);");
   hibernateUtil
       .executeSQLCommand("create table attendees (uid int, firstName varchar, lastName varchar,  event_id int);");
   hibernateUtil
       .executeSQLCommand("create table events (uid int , name varchar, start_date date, duration integer,location_id int);");
   Session session = hibernateUtil.getSession();
   Event e = new Event();
   e.setName("testSave");
   Location l = new Location();
   l.setName("building 1");
   e.setLocation(l);
   e.setSpeakers(new HashSet());
   e.getSpeakers().add(new Speaker("John", "Doe"));
   e.setAttendees(new HashSet());
   e.getAttendees().add(new Attendee("John", "Smith"));
   //session.save(l);
   session.save(e);
 //  session.flush();
   
   session.close();
   hibernateUtil.checkData("select * from events");
   hibernateUtil.checkData("select * from speakers");
   hibernateUtil.checkData("select * from locations");
   hibernateUtil.checkData("select * from attendees");
 }

}</source>