commentdao.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.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 Comment.
 * 
 * @see com.ata.wx.java01b.dao.Comment
 * @author MyEclipse Persistence Tools
 */

public class CommentDAO extends BaseHibernateDAO {
	private static final Log log = LogFactory.getLog(CommentDAO.class);
	// property constants
	public static final String CONTENT = "content";

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

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

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

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

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

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

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

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