What is difference between transient persistent and detached object in hibernate?

What is difference between transient persistent and detached object in hibernate?

Hibernate defines and supports the following object states: Transient – an object is transient if it has just been instantiated using the new operator, and it is not associated with a Hibernate Session . Detached – a detached instance is an object that has been persistent, but its Session has been closed.

What is detached instance in hibernate?

Detached – A detached instance is an object that has been persistent, but its Session has been closed. A detached instance can be reattached to a new Session at a later point in time, making it persistent again.

How do you make a detached object in hibernate?

When you close the hibernate session or call the evict() method then the object moves to the detached state. In this state, hibernate doesn’t track the object but you can re-attach a detached object to Hibernate session by calling the update() or saveOrUpdate(), or merge() method.

What is the difference between a persistent object and a transient object?

3 Answers. Persistent means that the object has been saved to the database whereas transient means that it hasn’t been saved yet. So for example when you get an entity from a repository, that entity is persistent. When you create a new entity, it is transient until persisted.

What is interceptor in hibernate?

The Hibernate Interceptor is an interface that allows us to react to certain events within Hibernate. With such a callback, an application can intercept core Hibernate’s operations such as save, update, delete, etc. There are two ways of defining interceptors: implementing the org.

Which of the following about transient and detached objects is true?

Transient and detached objects in hibernate are Correct Answer: Instances of persistent class that are not currently associated with session.

What is transient instance state in hibernate?

The transient state is the initial state of an object. Once we create an instance of POJO class, then the object entered in the transient state. Here, an object is not associated with the Session. So, the transient state is not related to any database.

How do you make a detached object persistence in Hibernate?

What is the proper way to re-attach detached objects in Hibernate…

1. getHibernateTemplate(). update( obj ) This works if and only if an object doesn’t already exist in the hibernate session.
2. getHibernateTemplate(). merge( obj ) This works if and only if an object exists in the hibernate session.

How many SessionFactory objects create application?

SessionFactory is a factory for Session objects. We can create one SessionFactory implementation per database in any application.

What is the result of lazy loading strategy in hibernate?

Hibernate now can “lazy-load” the children, which means that it does not actually load all the children when loading the parent. Instead, it loads them when requested to do so. You can either request this explicitly or, and this is far more common, hibernate will load them automatically when you try to access a child.

Which object is used to create SessionFactory objects hibernate?

Configuration object
Configuration object is used to create a SessionFactory object.

What is a transient object in hibernate?

Hibernate defines and supports the following object states: An object is transient if it has just been instantiated using the new operator, and it is not associated with a Hibernate Session. For example, here we are creating a Student object using new operator and note that we are not saving student object to a database using Hibernate Session.

What is the state of objectobject in hibernate?

Object in hibernate has following states: Transient – Objects instantiated using the new operator are called transient objects. An object is transient if it has just been instantiated using the new operator, and it is not associated with a Hibernate Session.

What is detached state in hibernate?

Detached State: Now, if we close the Hibernate Session, the persistent instance will become a detached instance: it isn’t attached to a Session anymore (but can still be modified and reattached to a new Session later though). Transient objects do not have association with the databases and session objects.

What is persistent object in Hibernate session?

An object that is associated with the hibernate session is called as Persistent object. When the object is in persistent state, then it represent one row of the database and consists of an identifier value.You can make a transient instance persistent by associating it with a Session.? 3. Detached Object State: