Difference Between get() and load() in Hibernate

HibernateObject Oriented ProgrammingProgramming

In hibernate, get() and load() are two methods which is used to fetch data for the given identifier. They both belong to Hibernate session class. Get() method return null, If no row is available in the session cache or the database for the given identifier whereas load() method throws object not found exception. 

Sr. No.
Key
Get()
Load()

1

Basic 

It  is used to fetch data from the database for the given identifier  

It  is also used to fetch data from the database for the given identifier 

2

Null Object 

It object not found for the given identifier then it will return null object 

It will throw object not found exception 

3


Lazy or Eager loading 

It returns fully initialized object so this method eager load the object  

It always returns proxy object so this method is lazy load the object  

4

Performance 

It is slower than load() because it return fully initialized object which impact the performance of the application 

It is slightly faster.

5.

Use Case

If you are not sure that object exist then use get() method 

If you are sure that object exist then use load() method 

Example of Get() in Hibernate

@Entity
public class User {
   @Id
   Integer id;
   String name;
   public Integer getId() {
      return id;
   }
   public void setId(Integer id) {
      this.id = id;
   }
   public String getName() {
      return name;
   }
   public void setName(String name) {
      this.name = name;
   }
}
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import com.journaldev.hibernate.util.HibernateUtil;
public class GetExample {
   public static void main(String[] args) {
      //get session factory to start transcation
      SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
      Session session = sessionFactory.openSession();
      Transaction tx = session.beginTransaction();
      //Get Example
      User user = (User) session.get(User.class, new Integer(2));
      System.out.println("User ID= "+user.getId());
      System.out.println("User Name= "+user.getName());
      //Close resources
      tx.commit();
      sessionFactory.close();
   }
}

Example of Load() in Hibernate

@Entity
public class User {
   @Id
   Integer id;
   String name;
   public Integer getId() {
      return id;
   }
   public void setId(Integer id) {
      this.id = id;
   }
   public String getName() {
      return name;
   }
   public void setName(String name) {
      this.name = name;
   }
}
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import com.journaldev.hibernate.util.HibernateUtil;
public class LoadExample {
   public static void main(String[] args) {
      //get session factory to start transcation
      SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
      Session session = sessionFactory.openSession();
      Transaction tx = session.beginTransaction();
      //Load Example
      User user = (User) session.load(User.class, new Integer(2));
      System.out.println("User ID= "+user.getId());
      System.out.println("User Name= "+user.getName());  
      //Close resources
      tx.commit();
      sessionFactory.close();
   }
}
raja
Published on 21-Jan-2020 07:15:02
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