What is the 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.
Which among these creates a new session even if a session already exists?
getCurrentSession
getCurrentSession() is called for the first time. This creates a brand new session if one does not exist or uses an existing one if one already exists.
What is the use of session in hibernate?
The Session interface is the main tool used to communicate with Hibernate. It provides an API enabling us to create, read, update, and delete persistent objects. The session has a simple lifecycle. We open it, perform some operations, and then close it.
How many SessionFactory is are created per application in Hibemate session?
SessionFactory is a factory for Session objects. We can create one SessionFactory implementation per database in any application.
What is difference between openSession and current session?
openSession() always opens a new session that you have to close once you are done with the operations. SessionFactory. getCurrentSession() returns a session bound to a context – you don’t need to close this.
What is the difference between session and EntityManager?
1 Answer. 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).
What is open session in hibernate?
When should I close Hibernate session?
It should be closed when you’re done with (but this can be done automatically for you as we’ll see). I have no question when using it in a standalone application.
What is open session in Hibernate?
Can I reuse the session in Hibernate?
Obviously, you can. A hibernate session is more or less a database connection and a cache for database objects. And you can have multiple successive transactions in a single database connection. Whether you should or not is a matter of reusing objects from session.
Can Hibernate Session span many transactions?
Obviously, you can. A hibernate session is more or less a database connection and a cache for database objects. And you can have multiple successive transactions in a single database connection. More, when you use a connection pool, the connection is not closed but is recycled.
Why SessionFactory is used in Hibernate?
SessionFactory is an Interface which is present in org. hibernate package and it is used to create Session Object. It is immutable and thread-safe in nature. buildSessionFactory() method gathers the meta-data which is in the cfg Object.
