userdao.java

速动画教程第十八集 SSH框架的构建 此过程将包括以下几个框架 Struts 、Spring 、Hibernate 、Tiles 、validator 工具：Eclipse3.1 、My

package com.oa.data.dao.impl;
// default package

import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.LockMode;
import org.hibernate.criterion.Example;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.oa.data.bo.User;
import com.oa.data.dao.IUserDAO;

/**
 * Data access object (DAO) for domain model class User.
 * @see .User
 * @author MyEclipse - Hibernate Tools
 */
public class UserDAO extends HibernateDaoSupport implements IUserDAO {

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

	protected void initDao() {
		//do nothing
	}
    
    /* (non-Javadoc)
	 * @see com.oa.data.dao.impl.IUserDAO#save(com.oa.data.bo.User)
	 */
    public void save(User transientInstance) {
        log.debug("saving User instance");
        try {
            getHibernateTemplate().saveOrUpdate(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
	/* (non-Javadoc)
	 * @see com.oa.data.dao.impl.IUserDAO#delete(com.oa.data.bo.User)
	 */
	public void delete(User persistentInstance) {
        log.debug("deleting User instance");
        try {
            getHibernateTemplate().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }
    
    /* (non-Javadoc)
	 * @see com.oa.data.dao.impl.IUserDAO#findById(java.lang.Integer)
	 */
    public User findById( java.lang.Integer id) {
        log.debug("getting User instance with id: " + id);
        try {
            User instance = (User) getHibernateTemplate()
                    .get("User", id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    
    /* (non-Javadoc)
	 * @see com.oa.data.dao.impl.IUserDAO#findByExample(com.oa.data.bo.User)
	 */
    public List findByExample(User instance) {
        log.debug("finding User instance by example");
        try {
            List results = getSession()
                    .createCriteria("User")
                    .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;
        }
    }    
    
    /* (non-Javadoc)
	 * @see com.oa.data.dao.impl.IUserDAO#merge(com.oa.data.bo.User)
	 */
    public User merge(User detachedInstance) {
        log.debug("merging User instance");
        try {
            User result = (User) getHibernateTemplate()
                    .merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) {
            log.error("merge failed", re);
            throw re;
        }
    }

    /* (non-Javadoc)
	 * @see com.oa.data.dao.impl.IUserDAO#attachDirty(com.oa.data.bo.User)
	 */
    public void attachDirty(User instance) {
        log.debug("attaching dirty User instance");
        try {
            getHibernateTemplate().saveOrUpdate(instance);
            log.debug("attach successful");
        } catch (RuntimeException re) {
            log.error("attach failed", re);
            throw re;
        }
    }
    
    /* (non-Javadoc)
	 * @see com.oa.data.dao.impl.IUserDAO#attachClean(com.oa.data.bo.User)
	 */
    public void attachClean(User instance) {
        log.debug("attaching clean User instance");
        try {
            getHibernateTemplate().lock(instance, LockMode.NONE);
            log.debug("attach successful");
        } catch (RuntimeException re) {
            log.error("attach failed", re);
            throw re;
        }
    }

	public static IUserDAO getFromApplicationContext(ApplicationContext ctx) {
    	return (IUserDAO) ctx.getBean("UserDAO");
	}

	public User findByUsername(String username) {
		// TODO Auto-generated method stub
		log.debug("getting User instance with userName: " + username);
		try {
			List list = getHibernateTemplate().find(
					"from User as u where userName = ?", username);
			if(list.size() > 0) {
				User instance = (User) list.get(0);
				return instance;
			} else {
				return null;
			}
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}
}