What is Detachedcriteria in hibernate?
The detached criteria allows you to create the query without Session . Then you can execute the search in an arbitrary session. In fact you should think carefully when using a detached criteria using another, or a new, session (no cache, and creation of the session).
How do you use detached criteria?
Detached Criteria may be used in two scenarios:
- Building criteria query with no session object: Session only requires during executing the query/submitting the query to database, not while building the query.
- Building same criteria query for multiple times:
What is hibernate criteria?
Hibernate provides alternate ways of manipulating objects and in turn data available in RDBMS tables. One of the methods is Criteria API, which allows you to build up a criteria query object programmatically where you can apply filtration rules and logical conditions.
What is Setprojection hibernate?
Hibernate Projection is used to read a partial entity from the database. If we want to read more than one property from the database, then we have to add Projection objects to ProjectionList, and then we need to set ProjectionList object to Criteria.
Why SessionFactory is used in Hibernate?
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.
What is the use of detached criteria?
The detached criteria allows you to create the query without Session. Then you can execute the search in an arbitrary session. In fact you should think carefully when using a detached criteria using another, or a new, session (no cache, and creation of the session).
Why would you use detachedcriteria?
I have used DetachedCriteria here because The Avengers were very specific and said they do not want anything to do with the Hibernate session, so hence i used DetachedCriteria which does not require a hibernate session to be present. Our primary objective is to retrieve The Avenger to whom a villain belongs to.
What is the use of detach criteria in hibernate?
-Detached criteria is very good alternate when the hibernate session is not present. -The criteria are online, which means that it uses Session class object. But the detached criteria is offline because it doesn’t need a session. -Then the detach criteria allow code reusability.