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Difference between save() and persist() in Hibernate
Save() and persist() both methods are used for saving object in the database.
As per docs −
Save() − Persist the given transient instance, first assigning a generated identifier. (Or using the current value of the identifier property if the assigned generator is used.) This operation cascades to associated instances if the association is mapped with cascade="save-update".
As per docs −
persist() − Make a transient instance persistent. This operation cascades to associated instances if the association is mapped with cascade="persist". The semantics of this method are defined by JSR-220.
| Sr. No. |
Key |
save() |
persist() |
|---|---|---|---|
1 |
Basic |
It stores object in database |
It also stores object in database |
2 |
Return Type |
It return generated id and return type is serializable |
It does not return anything. Its void return type. |
3 |
Transaction Boundaries |
It can save object within boundaries and outside boundaries |
It can only save object within the transaction boundaries |
4. |
Detached Object |
It will create a new row in the table for detached object |
It will throw persistence exception for detached object |
5. |
Supported by |
It is only supported by Hibernate |
It is also supported by JPA |
Example of Save 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 SaveExample {
public static void main(String[] args) {
//get session factory to start transcation
SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
User user = new User();
user.setId(1)
user.setName("ABCD")
session.save(user);
//Close resources
tx.commit();
sessionFactory.close();
}
}
Example of Persist 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 PersistExample {
public static void main(String[] args) {
//get session factory to start transcation
SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
User user = new User();
user.setId(1)
user.setName("ABCD")
session.persist(user);
//Close resources
tx.commit();
sessionFactory.close();
}
}
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