tprojectdao.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 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 TProject.
 * @see edu.neu.sspp.hibernate.TProject
 * @author MyEclipse - Hibernate Tools
 */
public class TProjectDAO extends BaseHibernateDAO {

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

	//property constants
	public static final String NAME = "name";
	public static final String INTRO = "intro";
	public static final String URL = "url";
	public static final String COUNT = "count";
	public static final String BROWSE = "browse";

    
    public void save(TProject transientInstance) {
        log.debug("saving TProject instance");
        try {
            getSession().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
	public void delete(TProject persistentInstance) {
        log.debug("deleting TProject instance");
        try {
            getSession().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }
    
    public TProject findById( java.lang.String id) {
        log.debug("getting TProject instance with id: " + id);
        try {
            TProject instance = (TProject) getSession()
                    .get("edu.neu.sspp.hibernate.TProject", id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    public int getCount() {
    	log.debug("getting count of TProject");
    	
    	try {
        	String queryString = "select count(*) from TProject";
        	Query queryObject = getSession().createQuery(queryString);
        	
        	return ((Integer)queryObject.list().get(0)).intValue();
    	} catch (RuntimeException re) {
    		log.error("getting count of TProject failed", re);
    		throw re;
    	}
    }
    
    public List getByPage(int first, int size) {
    	log.debug("getting TProject for page");
    	
    	try {
    		//按日期降序排列
        	String queryString = "from TProject as project order by project.dateTime desc";
        	Query queryObject = getSession().createQuery(queryString);
        	queryObject.setFirstResult(first);
        	//mysql似乎不支持setFetchSize，无法实现部分查询，只能通过setMaxResults在返回结果上控制
        	//queryObject.setFetchSize(size);
        	queryObject.setMaxResults(size);
        	return queryObject.list();
    	} catch(RuntimeException re) {
    		log.error("get by page failed", re);
    		throw re;
    	}
    }
    
    public List getCommProj() {
    	log.debug("getting Commend TProject");
    	
    	try {
	    	String queryString = "from TProject as project where project.isCommend = 1 order by project.commendDate desc";
	    	Query queryObject = getSession().createQuery(queryString);
	    	queryObject.setFirstResult(0);
	    	queryObject.setMaxResults(edu.neu.sspp.Constant.index_count);
    	return queryObject.list();
    	} catch(RuntimeException re) {
    		log.error("get commend failed", re);
    		throw re;
    	}
    	
    	
    }
    
    public List findByExample(TProject instance) {
        log.debug("finding TProject instance by example");
        try {
            List results = getSession()
                    .createCriteria("edu.neu.sspp.hibernate.TProject")
                    .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 TProject instance with property: " + propertyName
            + ", value: " + value);
      try {
         String queryString = "from TProject 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 findByName(Object name) {
		return findByProperty(NAME, name);
	}
	
	public List findByIntro(Object intro) {
		return findByProperty(INTRO, intro);
	}
	
	public List findByUrl(Object url) {
		return findByProperty(URL, url);
	}
	
	public List findByCount(Object count) {
		return findByProperty(COUNT, count);
	}
	
	public List findByBrowse(Object browse) {
		return findByProperty(BROWSE, browse);
	}
	
    public TProject merge(TProject detachedInstance) {
        log.debug("merging TProject instance");
        try {
            TProject result = (TProject) getSession()
                    .merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) {
            log.error("merge failed", re);
            throw re;
        }
    }

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