newsdaohibernate.java

STRUTS数据库项目开发宝典

package com.relationinfo.dao.hibernate;

import java.util.List;

import com.relationinfo.model.News;
import com.relationinfo.dao.NewsDAO;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.criterion.Example;
import org.hibernate.criterion.MatchMode;

import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.orm.hibernate3.HibernateCallback;

public class NewsDAOHibernate extends BaseDAOHibernate implements NewsDAO {

    /**
     * @see com.relationinfo.dao.NewsDAO#getNewss(com.relationinfo.model.News)
     */
    public List getNewss(final News news) {
        if (news == null) {
            return getHibernateTemplate().find("from News");
        } else {
            // filter on properties set in the news
            HibernateCallback callback = new HibernateCallback() {
                public Object doInHibernate(Session session) throws HibernateException {
                    Example ex = Example.create(news).ignoreCase().enableLike(MatchMode.ANYWHERE);
                    return session.createCriteria(News.class).add(ex).list();
                }
            };
            return (List) getHibernateTemplate().execute(callback);
        }
    }

    /**
     * @see com.relationinfo.dao.NewsDAO#getNews(String newscode)
     */
    public News getNews(final String newscode) {
        News news = (News) getHibernateTemplate().get(News.class, newscode);
        if (news == null) {
            log.warn("uh oh, news with newscode '" + newscode + "' not found...");
            throw new ObjectRetrievalFailureException(News.class, newscode);
        }

        return news;
    }

    /**
     * @see com.relationinfo.dao.NewsDAO#saveNews(News news)
     */    
    public void saveNews(final News news) {
        getHibernateTemplate().saveOrUpdate(news);
    }

    /**
     * @see com.relationinfo.dao.NewsDAO#removeNews(String newscode)
     */
    public void removeNews(final String newscode) {
        getHibernateTemplate().delete(getNews(newscode));
    }
}