userdao.java

一个初学者的入门ssh应用。。。应该对很多人有帮助

package org.langsin.dao.impl;

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.langsin.dao.IUserDAO;
import org.langsin.vo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

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

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

	//property constants
	public static final String USERNAME = "username";
	public static final String PASSWORD = "password";

	protected void initDao() {
		//do nothing
	}
    
    public void save(User transientInstance) {
        log.debug("saving User instance");
        try {
            getHibernateTemplate().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
	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;
        }
    }
    
    public User findById( java.lang.Integer id) {
        log.debug("getting User instance with id: " + id);
        try {
            User instance = (User) getHibernateTemplate()
                    .get("org.langsin.vo.User", id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    
    public List findByExample(User instance) {
        log.debug("finding User instance by example");
        try {
            List results = getHibernateTemplate().findByExample(instance);
            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 User instance with property: " + propertyName
            + ", value: " + value);
      try {
         String queryString = "from User as model where model." 
         						+ propertyName + "= ?";
		 return getHibernateTemplate().find(queryString, value);
      } catch (RuntimeException re) {
         log.error("find by property name failed", re);
         throw re;
      }
	}

	public List findByUsername(Object username) {
		return findByProperty(USERNAME, username);
	}
	
	public List findByPassword(Object password) {
		return findByProperty(PASSWORD, password);
	}
	
    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;
        }
    }

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

	public boolean verify(String userName, String userPwd) {
		final String HQL="FROM User u where u.username=? and password=?";
		String[] hqlParameter=new String[2];
		hqlParameter[0]=userName;
		hqlParameter[1]=userPwd;
		List list=this.getHibernateTemplate().find(HQL,hqlParameter);
		if(list.size()>0){
			return true;
		}
		
		return false;
	}
}