Java Tutorial/Hibernate/Cascade Action

Bag Inverse Cascade Delete Orphan

File: Main.java

import org.hibernate.Session;
public class Main {
  public static void main(String[] args) throws Exception {
    HibernateUtil hibernateUtil = new HibernateUtil();
    hibernateUtil
        .executeSQLCommand("create table Product(id int, name varchar, description varchar, price decimal(6,2), supplierid int)");
     
    hibernateUtil
    .executeSQLCommand("create table Supplier (id int , name varchar)");
    hibernateUtil
    .executeSQLCommand("create table Software(id int, name varchar, description varchar, price decimal(6,2), supplierid int, version varchar)");
    
    Session session = hibernateUtil.getSession();
    Supplier superCorp = new Supplier();
    superCorp.setName("Supplier1");
    session.save(superCorp);
    
    Supplier megaInc = new Supplier();
    megaInc.setName("Supplier2");
    session.save(megaInc);        
    Product mouse = new Product("Product1","first product", 20.0);
    mouse.setSupplier(superCorp);
    superCorp.getProducts().add(mouse);
    session.flush();
    Product mouse2 = new Product("Product2","second product", 22.0);
    mouse2.setSupplier(superCorp);
    superCorp.getProducts().add(mouse2);        
    
    Product keyboard = new Product("Product3", "third product", 30.0);
    keyboard.setSupplier(megaInc);
    megaInc.getProducts().add(keyboard);
    Software webBrowser = new Software("Web Browser","new browser", 75.0, "2.0");
    webBrowser.setSupplier(superCorp);
    superCorp.getProducts().add(webBrowser);
    Software email = new Software("Email","email client", 49.99, "4.1 Edition");
    email.setSupplier(megaInc);
    megaInc.getProducts().add(email);    
    session.flush();
    session.close();
    hibernateUtil.checkData("select * from Product");
    hibernateUtil.checkData("select * from Software");
    hibernateUtil.checkData("select * from Supplier");
  }
}

Cascade.All

File: Main.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");
  }
}