userdao.java

java web 开发者突击 三层架构 实例

package com.demo.hibernate.dao;

import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.demo.hibernate.beans.User;

public class UserDAO extends HibernateDaoSupport implements IUserDAO {

	public boolean isValid(final String username, final String password) {
		List list = (List) getHibernateTemplate().execute(new HibernateCallback() {
			public Object doInHibernate(Session session)
					throws HibernateException {
				List result = session.createCriteria(User.class).add(
						Restrictions.eq("username", username)).add(
						Restrictions.eq("password", password)).list();
				return result;
			}
		});
		if (list.size() > 0) {
			return true;
		} else {
			return false;
		}
	}

	public boolean isExist(final String username) {
		List list = (List) getHibernateTemplate().execute(new HibernateCallback() {
			public Object doInHibernate(Session session)
					throws HibernateException {
				List result = session.createCriteria(User.class).add(
						Restrictions.eq("username", username)).list();
				return result;
			}
		});
		if (list.size() > 0) {
			return true;
		} else {
			return false;
		}
	}

	public void insertUser(User user) {
		getHibernateTemplate().saveOrUpdate(user);
	}

	public User getUser(String userid) {
		return (User) getHibernateTemplate().get(User.class,
				new Integer(userid));
	}

	public List getUsers() {
		return getHibernateTemplate().find("from User");
	}

	public void deleteUser(String userid) {
		Object p = getHibernateTemplate().load(User.class, new Integer(userid));
		getHibernateTemplate().delete(p);
	}
}