Hibernate

What does hibernate uses reflection API for?

• Hibernate uses reflection extensively under the hood to map Java objects to Database tables And vice versa.

 In hibernate, how can we get data from the database?

• We can get using session object.
• The methods are get and load.
• We have a query and criteria interfaces Based on which we can get the object.

What methods are available to get data from database in hibernate?

• We have system object via which we can get data from database.
• Methods are get and load.
• We have query and criteria interfaces to get an object.
• Load method with a specifier returns, a proxy object of that entity.
• When we perform a method, it goes to database and get the actual data.

What is the difference between get and load?

• When we use the load method with any specifier, it will not give you actual object, but proxy object.
• When we use get method, it will go to database and Fire native query To get actual data.

What are the three states of hibernate entity?

• New or transient, attached, rested or detached state.
• When an object is not attached With any Session, it is just created. It is in New or transient state.
• Not yet attached with session.
• If an object is associated with Session, then it is said to be in attached state.
• Once we perform any operations and commit, it is again not held by any session. It is in detached state.