tmessagedao.java

使用JSP+Servlet+Hibernate+Struts实现的一个学生软件发布平台

package edu.neu.sspp.hibernate;

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;

/**
 * Data access object (DAO) for domain model class TMessage.
 * @see edu.neu.sspp.hibernate.TMessage
 * @author MyEclipse - Hibernate Tools
 */
public class TMessageDAO extends BaseHibernateDAO {

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

	//property constants
	public static final String MESSAGE = "message";

    
    public void save(TMessage transientInstance) {
        log.debug("saving TMessage instance");
        try {
            getSession().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
	public void delete(TMessage persistentInstance) {
        log.debug("deleting TMessage instance");
        try {
            getSession().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }
	
	public TMessage getMessage() {
		log.debug("getting message!");
    	try {
	    	String queryString = "from TMessage as message order by message.dateTime desc";
	    	Query queryObject = getSession().createQuery(queryString);
	    	queryObject.setFirstResult(0);
	    	queryObject.setMaxResults(1);
	    	
	    	List list = queryObject.list();
	    	if(list.isEmpty())
	    		return new TMessage("", new Date());
	    	else
	    		return (TMessage)queryObject.list().get(0);
    	} catch(RuntimeException re) {
    		log.error("get commend failed", re);
    		throw re;
    	}
	}
    
    public TMessage findById( java.lang.String id) {
        log.debug("getting TMessage instance with id: " + id);
        try {
            TMessage instance = (TMessage) getSession()
                    .get("edu.neu.sspp.hibernate.TMessage", id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    
    public List findByExample(TMessage instance) {
        log.debug("finding TMessage instance by example");
        try {
            List results = getSession()
                    .createCriteria("edu.neu.sspp.hibernate.TMessage")
                    .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 TMessage instance with property: " + propertyName
            + ", value: " + value);
      try {
         String queryString = "from TMessage 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 findByMessage(Object message) {
		return findByProperty(MESSAGE, message);
	}
	
    public TMessage merge(TMessage detachedInstance) {
        log.debug("merging TMessage instance");
        try {
            TMessage result = (TMessage) getSession()
                    .merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) {
            log.error("merge failed", re);
            throw re;
        }
    }

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