newstdao.java

struts+hibernate模式的在线信息发布系统

package po.news;

import hibernate.BaseHibernateDAO;
import java.util.Date;
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 org.hibernate.*;
import org.hibernate.criterion.*;

/**
 * Data access object (DAO) for domain model class Newst.
 * @see po.news.Newst
 * @author MyEclipse - Hibernate Tools
 */
public class NewstDAO extends BaseHibernateDAO {

    private static final Log log = LogFactory.getLog(NewstDAO.class);

	//property constants
	public static final String COLUMN_ID = "columnId";
	public static final String TITLE = "title";
	public static final String CONTENT = "content";
	public static final String AUTHOR = "author";

	
	/**
	 * @param author
	 * @param title
	 * @return
	 */
	public List findByHQL(String author,String title)
	{
        log.debug("getting Newst instances List by author:"+author+" and title:" + title);
        try {
    		Criteria criteria=getSession().createCriteria(Newst.class);
    		
    		if(!author.equals(""))
    		{
    			criteria.add(Expression.eq("author", author));
    		}
    		
    		if(!title.equals(""))
    		{
    			criteria.add(Expression.like("title", title,MatchMode.ANYWHERE));
    		} 
    		
    		List list=criteria.list();
        	
        	log.debug("getting list successful");
        	
        	return list;
        	
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
	}
    
    public void save(Newst transientInstance) {
        log.debug("saving Newst instance");
        try {
            getSession().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
	public void delete(Newst persistentInstance) {
        log.debug("deleting Newst instance");
        try {
            getSession().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }
    
    public Newst findById( java.lang.Integer id) {
        log.debug("getting Newst instance with id: " + id);
        try {
            Newst instance = (Newst) getSession()
                    .get("po.news.Newst", id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    
    public List findByExample(Newst instance) {
        log.debug("finding Newst instance by example");
        try {
            List results = getSession()
                    .createCriteria("po.news.Newst")
                    .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 Newst instance with property: " + propertyName
            + ", value: " + value);
      try {
         String queryString = "from Newst 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 findByColumnId(Object columnId) {
		return findByProperty(COLUMN_ID, columnId);
	}
	
	public List findByTitle(Object title) {
		return findByProperty(TITLE, title);
	}
	
	public List findByContent(Object content) {
		return findByProperty(CONTENT, content);
	}
	
	public List findByAuthor(Object author) {
		return findByProperty(AUTHOR, author);
	}
	
    public Newst merge(Newst detachedInstance) {
        log.debug("merging Newst instance");
        try {
            Newst result = (Newst) getSession()
                    .merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) {
            log.error("merge failed", re);
            throw re;
        }
    }

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