What is open session in hibernate?
Hibernate SessionFactory openSession() method always opens a new session. We should close this session object once we are done with all the database operations. We should open a new session for each request in multi-threaded environment.
What is current session in hibernate?
getCurrentSession , it will provide you session object which is in hibernate context and managed by hibernate internally. It is bound to transaction scope. When you call SessionFactory. getCurrentSession , it creates a new Session if it does not exist, otherwise use same session which is in current hibernate context.
What is difference between session and SessionFactory in hibernate?
SessionFactory is a factory class for Session objects. It is available for the whole application while a Session is only available for particular transaction. Session is short-lived while SessionFactory objects are long-lived. SessionFactory provides a second level cache and Session provides a first level cache.
What are the session methods in hibernate?
Session Interface Methods
| Sr.No. | Session Methods & Description |
|---|---|
| 1 | Transaction beginTransaction() Begin a unit of work and return the associated Transaction object. |
| 2 | void cancelQuery() Cancel the execution of the current query. |
| 3 | void clear() Completely clear the session. |
Which parameters of open session object explicitly close the session object?
openSession vs getCurrentSession :
| Parameter | openSession |
|---|---|
| Flush and close | You need to explicitly flush and close session objects |
| Performance | In single threaded environment , It is slower than getCurrentSession |
| Configuration | You do not need to configure any property to call this method |
How do I close an open session in Hibernate?
if you decide to use sessionFactory. openSession() , you’ll have to manage the session yourself and to flush and close it “manually”.
What is Session factor?
SessionFactory is an interface. SessionFactory can be created by providing Configuration object, which will contain all DB related property details pulled from either hibernate. cfg. xml file or hibernate. SessionFactory is a factory for Session objects.
What is difference between JDBC and Hibernate?
The short answer on the fundamental difference between JDBC and Hibernate is that Hibernate performs an object-relational mapping framework, while JDBC is simply a database connectivity API. The long answer requires a history lesson on database access with Java.
What is the difference between Session and EntityManager?
Session is a hibernate-specific API, EntityManager is a standardized API for JPA. You can think of the EntityManager as an adapter class that wraps Session (you can even get the Session object from an EntityManager object via the getDelegate() function).
How many session methods are there in Hibernate?
In other words, it provides the connectivity between your application and database. It offers various functions such as create, delete, get, update to operate on the database by using session methods that exist in four states namely: Transient, Persistent and Detached, Removed.
What is the role of session interface in Hibernate?
– The Session interface is the primary interface used by hibernate applications. – It is a single-threaded, short-lived object representing a conversation between the application and the persistent store. – It allows you to create query objects to retrieve persistent objects.
How can close current session in hibernate?
4 Answers
- if you use sessionFactory. getCurrentSession() , you’ll obtain a “current session” which is bound to the lifecycle of the transaction and will be automatically flushed and closed when the transaction ends (commit or rollback).
- if you decide to use sessionFactory.
How do I open a session in hibernate?
When you get a session from the session factory object in hibernate, either you can use openSession or getCurrentSession. If you are using the openSession method, it opens a new session freshly.
What is SessionFactory getcurrentsession in hibernate?
getCurrentSession: When you call SessionFactory.getCurrentSession, it will provide you session object which is in hibernate context and managed by hibernate internally. It is bound to transaction scope.
What is a session object?
The Session object is lightweight and designed to be instantiated each time an interaction is needed with the database. Persistent objects are saved and retrieved through a Session object.
What is the difference between getcurrentsession () and opensession ()?
If you are using the openSession method, it opens a new session freshly. If you use getCurrentSession, it gets the current session from the existing thread context instead of opening a new session.