Question

Suppose, objects of type A are stored in DB. Here’s the way I load specific one from DB using hibernate:

org.hibernate.Session session = ...; long id = 1; A obj = session.load(A.class, id); 

If object with id=1 doesn’t exist I will get ObjectNotFoundException. But is there a way to check if such object exists without having to catch the exception? What I would like to have is smth like:

org.hibernate.Session session = ...; long id = 1; boolean exists = session.exists(A.class, id); if(exists){  // do smth..... } 

Couldn’t find it hibernate docs…

Answer 1

You can use session.get:

public Object get(Class clazz,                   Serializable id)            throws HibernateException 

It will return null if the object does not exist in the database. You can find more information in Hibernate API Documentation.