Contents
- 1 How many session factory are created per application in hibernate session?
- 2 Is session factory singleton or session?
- 3 What is session factory?
- 4 Why SessionFactory is thread safe why not Session?
- 5 Which method is called before object is deleted in Hibernate?
- 6 What is session factory responsible for?
- 7 What’s the difference between session and session factory?
- 8 When to create a session factory in MySQL?
- 9 How are session objects like factories in hibernate?
How many session factory are created per application in hibernate session?
SessionFactory is a factory for Session objects. We can create one SessionFactory implementation per database in any application. If your application is referring to multiple databases, then you need to create one SessionFactory per database.
Is session factory singleton or session?
4 Answers. Session factory objects are to be implemented using the singleton design pattern. Instances of SessionFactory are thread-safe and typically shared throughout an application.
What is session factory?
The SessionFactory is a factory of session and client of ConnectionProvider. It holds second level cache (optional) of data. The org. hibernate. SessionFactory interface provides factory method to get the object of Session.
How many sessions hibernate factories?
hibernate” package. Session factory is long live multithreaded object. Usually one session factory should be created for one database. When you have multiple databases in your application you should create multiple SessionFactory object.
Why session factory is thread safe?
Most problems with concurrency occur due to sharing of objects with mutable state. Once the object is immutable, its internal state is settled on creation and cannot be changed. So many threads can access it concurrently and request for sessions. hence the SessionFactory is thread-safe.
Why SessionFactory is thread safe why not Session?
Once the object is immutable, its internal state is setted on creation and cannot be changed. So many threads can access it concurrently and request for sessions. However, Session is a non-threadsafe object, you cannot share it between threads.
Which method is called before object is deleted in Hibernate?
onDelete()
Hibernate – Interceptors
| Sr.No. | Method & Description |
|---|---|
| 4 | onDelete() This method is called before an object is deleted. |
| 5 | onFlushDirty() This method is called when Hibernate detects that an object is dirty (i.e. have been changed) during a flush i.e. update operation. |
What is session factory responsible for?
Most importantly, the SessionFactory in Hibernate is responsible for the creation of Session objects. The Hibernate Session provides methods such as save, delete and update, all of which are used to perform CRUD-based operations on the database to which the SessionFactory connects.
Why session factory is thread-safe?
Which method is called before object is deleted in hibernate?
What’s the difference between session and session factory?
SessionFactory is a factory for Session objects. We can create one SessionFactory implementation per database in any application. If your application is referring to multiple databases, then you need to create one SessionFactory per database.
When to create a session factory in MySQL?
• Usually one session factory should be created for one database. • When you have multiple databases in your application you should create multiple SessionFactory object. • Assume the scenario that you are using one database called mysql in your application then following is the way to create the SessionFactory object :
How are session objects like factories in hibernate?
Session objects consist and are like a factory in SessionFactory. In any application, one can create an implementation of one sessionFactory per each database. If the application refers to multiple such databases, then one needs to create a SessionFactory per each database. This is considered as a heavy weight object.
How to use SessionFactory in a web application?
Normally, you will use one single session per what needs a transaction. For example in a Web application, session per request is a common design. But you could also use a higher level framework like Spring, that will do all SessionFactory and Session management for you.