states of object in hibernate

Q. What are the states of object in hibernate?

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Types of Object state in hibernate – 

  1.  Transient
  2.  Persistent
  3.  Detached

Suppose we have one entity Book.java.

package simpleentity;

import java.io.Serializable;
import javax.persistence.*;

@Entity
@Table(name = "book")
public class Book implements Serializable{
	
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = "book_id")
	private int bookId;

	@Column(name = "book_name")
	private String bookName;

	public String getBookName() {
		return bookName;
	}

	public void setBookName(String bookName) {
		this.bookName = bookName;
	}

	public int getBookId() {
		return bookId;
	}

	public void setBookId(int bookId) {
		this.bookId = bookId;
	}
}

We also have hibernate.cfg.xml.


<?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>
 
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver
</property>
 
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:XE</property>
 
<property name="connection.username">SYSTEM</property>
 
<property name="connection.password">oracle</property>
 
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
 
<property name="show_sql">true</property>
 
<property name="hbm2ddl.auto">create</property>
 
<mapping class="simpleentity.Book" />
 

 
 
</session-factory>

 </hibernate-configuration>

We have main class. ObjectStateExample.java


package onetoonetechhelpzones;

import org.hibernate.*;
import org.hibernate.cfg.Configuration;


public class ObjectStateExample {
	
	public static void main(String[] args) {
		
		SessionFactory factory = null;
		
		Session session = null;
		
		Configuration configuration = new Configuration().configure();
		
		try {
			
			factory = configuration.buildSessionFactory();
			
			session = factory.openSession();
			
			Transaction tx = session.beginTransaction();
			
			Book b = new Book();
			b.setBookName("book name 1");
			
			session.save(b);

			tx.commit();
			
			System.out.println("transaction completed ");
			
		} catch (Exception e) {
			
			System.out.println(e);

		} finally {

			session.close();

			factory.close();
		
		}
	}

}