petdaoimpl.java

用Struts+hibernate写的宠物医院

package com.sean.pet.hibernate.dao.impl;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.sean.pet.hibernate.HibernateSessionFactory;
import com.sean.pet.hibernate.dao.PetDao;
import com.sean.pet.hibernate.po.Pet;

public class PetDaoImpl implements PetDao {

	Session session = null;
	
	public void delete(String id) {
		// TODO Auto-generated method stub
		Transaction tr = null;
		try {
			session = HibernateSessionFactory.getSession();
			tr = session.beginTransaction();
			Pet pet = (Pet) session.load(Pet.class, id);
			session.delete(pet);
			tr.commit();
		} catch (HibernateException e) {
			e.printStackTrace();
			tr.rollback();
		} finally {
			
		}
		HibernateSessionFactory.closeSession();
	}

	@SuppressWarnings("unchecked")
	public List<Pet> findAll() {
		// TODO Auto-generated method stub
		Transaction tr = null;
		List<Pet> list = new ArrayList<Pet>();
		try {
			session = HibernateSessionFactory.getSession();
			tr = session.beginTransaction();
			String hql = "from Pet";
			Query q = session.createQuery(hql);
			list = q.list();
			tr.commit();
			return list;
		} catch (HibernateException e) {
			e.printStackTrace();
			tr.rollback();
		} finally {
			
		}
		HibernateSessionFactory.closeSession();
		return null;
	}

	public Pet findByID(String id) {
		// TODO Auto-generated method stub
		Pet pet = null;
		Transaction tr = null;
		try {
			session = HibernateSessionFactory.getSession();
			tr = session.beginTransaction();
			String hql = "from Pet where id=?";
			Query q = session.createQuery(hql);
			q.setString(0, id);
			pet = (Pet)q.uniqueResult();
			tr.commit();
			return pet;
		} catch (HibernateException e) {
			e.printStackTrace();
			tr.rollback();
		} finally {
			
		}
		HibernateSessionFactory.closeSession();
		return null;
	}

	public void save(Pet pet) {
		// TODO Auto-generated method stub
		Transaction tr = null;
		try {
			session = HibernateSessionFactory.getSession();
			tr = session.beginTransaction();
			session.save(pet);
			tr.commit();
		} catch (HibernateException e) {
			e.printStackTrace();
			tr.rollback();
		} finally {
			
		}
		HibernateSessionFactory.closeSession();
	}

	public void update(Pet pet) {
		// TODO Auto-generated method stub
		Transaction tr = null;
		try {
			session = HibernateSessionFactory.getSession();
			tr = session.beginTransaction();
			session.merge(pet);
			tr.commit();
		} catch (HibernateException e) {
			e.printStackTrace();
			tr.rollback();
		} finally {
			HibernateSessionFactory.closeSession();
		}
		
	}

}