CODEWITHSUNDEEP
javahibernate
emilly
emilly

Reputation: 10530

Is explicit update required in hibernate?

In most of the hibernate applications i see the explicit update statement to update any hibernate entity in db

    Session session1 = factory.openSession();
    Transaction  tx1 = session1.beginTransaction();
    College college= (College)session1.get(College.class, 1);
    college.setCollegeName("College_update");
    session1.saveOrUpdate(college); // at line 1
    tx1.commit();
    session1.close();

But even i miss statement 1 , entity is updated in DB. My question is it a good practice to mention explicit update statement when it is not required even ?

Upvotes: 2

Views: 934

Answers (2)

redge
redge

Reputation: 1182

Update is required to take data from one session or transaction and save it into the database in another transaction. 

 A a = session1.load(......);
 // Commit transaction

//Start New session ......

 //Start transaction
 session2.update (a);

If you read an entity change its properties within the same session then the results will get saved when you flush the session.

Upvotes: 0

Richard Flitcroft
Richard Flitcroft

Reputation: 61

No, the saveOrUpdate statement is not required. The College entity is attached to your Hibernate session because is was instantiated by Hibernate. Any mutations to the College entity will be UPDATEd to the database when that session is flushed.

Use saveOrUpdate when you need to attach an existing (detached) entity to a hibernate session. Any subsequent mutations to that entity made in the scope of that session will be persisted.

Upvotes: 3

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