Hibernate Session.delete() an object if exists

Question

In JavaDoc of Session class the description of delete method is:

Remove a persistent instance from the datastore. The argument may be

Answer 1

Hibernate native query sample as follows.

import org.hibernate.query.nativeQuery;  

String sql = "Delete from Student where classId= :id"; 
NativeQuery query = session.createNativeQuery(sql.toString()); 
query.executeUpdate();