Hibernate Interceptor & query with parameter

Hibernate Interceptor

Hibernate interceptor allows application to change properties of a entity object before save, update, delete, or load. It allows to control follow or stop.

 
Attaching interceptor reference to hibernate session
==============================================

public int additeam(Item item) {
        Integer itemCode = 0;
        try {
            ItemInterceptor itemInterceptor = new ItemInterceptor();
            session = sessionFactory.openSession(itemInterceptor);
            transaction = session.beginTransaction();
            log.info("Before addItem - Dao");
            itemCode = (Integer) session.save(item);
            transaction.commit();
        } catch (HibernateException hibernateException) {
            transaction.rollback();
            log.info(hibernateException.getMessage());
        } finally {
            session.close();
        }
        return itemCode;
    }

Hibernate Interceptor -  Class Implementation:
=======================================
package com.xyz.interceptor;

import java.io.Serializable;
import org.hibernate.EmptyInterceptor;
import org.hibernate.type.Type;
import com.xyz.dto.Item;

public class ItemInterceptor extends EmptyInterceptor {
    /**
     * Pedababu M
     */
    private static final long serialVersionUID = 1L;
    private final Log   log  = LogFactory.getLog(getClass());
    public boolean onSave(Object entity, Serializable id, Object[] state,
            String[] propertyNames, Type[] types) {
        log.info("Before the  "+entity.getClass()+"   onSave....");
        log.info("getName "+entity.getClass().getName()+"   onSave....");
        log.info("getModifiers "+entity.getClass().getModifiers()+"   onSave....");
        log.info("S ID :" + id);
        for (int index = 0; index < state.length; index++) {
            log.info(state[index]);
        }
        //chnaging discount before saving - in interceptor
        if (entity instanceof Item) {
            ((Item) entity).setDiscount(10);
        }
        return super.onSave(entity, id, state, propertyNames, types);
    }
}

onDelete – This method is called before delete entity object

onLoad – This method is called before entity object initialization.

etc.

Query with parameter
================

        List<Item> itemList = null;
        Session session = null;
        try {
            session = sessionFactory.openSession();
            session.beginTransaction();
             Query query =session.createQuery("from Item item where item.itemId=:itemId");
             query.setParameter("itemId", itemNo);
             itemList =query.list();
            log.info("itemList size::::" + itemList.size());
            Iterator<Item> it = itemList.iterator();
            while (it.hasNext()) {
                Item t = it.next();
                log.info(t.getItemId() + "   " + t.getItemName());
            }
        } catch(Exception exception){
            exception.printStackTrace();
        }
        finally {
            session.close();
        }