photodao.java

基于struts+hibernate的电子商务网站。可运行。数据库mysql

package tarena.dao;

import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.criterion.Example;

import tarena.entity.Photo;

/**
 * Data access object (DAO) for domain model class Photo.
 * 
 * @see tarena.entity.Photo
 * @author MyEclipse Persistence Tools
 */

public class PhotoDAO extends BaseHibernateDAO {
	private static final Log log = LogFactory.getLog(PhotoDAO.class);

	// property constants
	public static final String IMAGE = "image";

	public static final String DESCRIPTION = "description";

	public void save(Photo transientInstance) {
		log.debug("saving Photo instance");
		try {
			getSession().save(transientInstance);
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Photo persistentInstance) {
		log.debug("deleting Photo instance");
		try {
			getSession().delete(persistentInstance);
			log.debug("delete successful");
		} catch (RuntimeException re) {
			log.error("delete failed", re);
			throw re;
		}
	}

	public Photo findById(java.lang.Integer id) {
		log.debug("getting Photo instance with id: " + id);
		try {
			Photo instance = (Photo) getSession()
					.get("tarena.entity.Photo", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	@SuppressWarnings("unchecked")
	public Photo findByIds(Integer productid,Integer photoid){
		StringBuffer hql=new StringBuffer();
		hql.append("from Photo photo ");
		hql.append("where ");
		hql.append(" photo.product.id=? ");
	//	hql.append(" photo.id=? ");
		List<Photo>  re=getSession()
						.createQuery(hql.toString())
						.setParameter(0, productid)
						//.setParameter(0, photoid)
						.list();
		
		if(re.size()==0){
			return findById(1);
		}
		
		return re.get(0);
	}
	
	public List findByExample(Photo instance) {
		log.debug("finding Photo instance by example");
		try {
			List results = getSession().createCriteria("tarena.entity.Photo")
					.add(Example.create(instance)).list();
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		} catch (RuntimeException re) {
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value) {
		log.debug("finding Photo instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Photo as model where model."
					+ propertyName + "= ?";
			Query queryObject = getSession().createQuery(queryString);
			queryObject.setParameter(0, value);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByImage(Object image) {
		return findByProperty(IMAGE, image);
	}

	public List findByDescription(Object description) {
		return findByProperty(DESCRIPTION, description);
	}

	public List findAll() {
		log.debug("finding all Photo instances");
		try {
			String queryString = "from Photo";
			Query queryObject = getSession().createQuery(queryString);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public Photo merge(Photo detachedInstance) {
		log.debug("merging Photo instance");
		try {
			Photo result = (Photo) getSession().merge(detachedInstance);
			log.debug("merge successful");
			return result;
		} catch (RuntimeException re) {
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Photo instance) {
		log.debug("attaching dirty Photo instance");
		try {
			getSession().saveOrUpdate(instance);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Photo instance) {
		log.debug("attaching clean Photo instance");
		try {
			getSession().lock(instance, LockMode.NONE);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}
}