newstypedao.java

struts hibernate spring实现新闻发布系统含说明文档

package com.ata.wx.java01b.dao;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

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;

/**
 * Data access object (DAO) for domain model class Newstype.
 * 
 * @see com.ata.wx.java01b.dao.Newstype
 * @author MyEclipse Persistence Tools
 */

public class NewstypeDAO extends BaseHibernateDAO {
	private static final Log log = LogFactory.getLog(NewstypeDAO.class);
	// property constants
	public static final String NEWSTYPE = "newstype";

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

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

	public Newstype findById(java.lang.String id) {
		log.debug("getting Newstype instance with id: " + id);
		try {
			Newstype instance = (Newstype) getSession().get(
					"com.ata.wx.java01b.dao.Newstype", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Newstype instance) {
		log.debug("finding Newstype instance by example");
		try {
			List results = getSession().createCriteria(
					"com.ata.wx.java01b.dao.Newstype").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 Newstype instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Newstype 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 findByNewstype(Object newstype) {
		return findByProperty(NEWSTYPE, newstype);
	}

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

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

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

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

	public List<Newstype> findTypeAddNews() {
		log.debug("finding type add news");
		try {
			String queryString = "from Newstype as type inner join fetch type.newses";
			Query queryObject = getSession().createQuery(queryString);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public static void main(String[] args) {
		NewstypeDAO dao = new NewstypeDAO();
		List<Newstype> typelist = dao.findTypeAddNews();
		Set<Newstype> typeset = new HashSet<Newstype>();
		for (Newstype n : typelist) {
			typeset.add(n);
		}
		for (Newstype type : typeset) {
			for (News news : type.getNewses()) {
				System.out.println("newstype:  " + type.getNewstype());
				System.out.println("news:  " + news.getNewsid());
			}
			System.out.println(typeset.size() + "===");
		}
	}
}