Question

What is automatic dirty checking in hibernate?

Answer 1

The automatic dirty checking feature of Hibernate, calls update statement automatically on the objects that are modified in a transaction.

Let's understand it by the example given below:

1. ...  
2. SessionFactory factory = cfg.buildSessionFactory();  
3. Session session1 = factory.openSession();  
4. Transaction tx=session2.beginTransaction();  
5.    
6. Employee e1 = (Employee) session1.get(Employee.class, Integer.valueOf(101));  
7.    
8. e1.setSalary(70000);  
9.    
10. tx.commit();  
11. session1.close();  

Here, after getting employee instance e1 and we are changing the state of e1.

After changing the state, we are committing the transaction. In such a case, the state will be updated automatically. This is known as dirty checking in hibernate.

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Answer 2

The automatic dirty checking feature of Hibernate, calls update statement automatically on the objects that are modified in a transaction.

Let's understand it by the example given below:

...  

SessionFactory factory = cfg.buildSessionFactory();  

Session session1 = factory.openSession();  

Transaction tx=session2.beginTransaction();  

   

Employee e1 = (Employee) session1.get(Employee.class, Integer.valueOf(101));  

   

e1.setSalary(70000);  

   

tx.commit();  

session1.close();  

Here, after getting employee instance e1 and we are changing the state of e1.

After changing the state, we are committing the transaction. In such a case, the state will be updated automatically. This is known as dirty checking in hibernate.