userdao.java

WebWork.Spring.Hibernate整合对数据库的操作.rar。开发环境TOMCAT5.5.23,Mysql5.0,jdk1.5.08,hibernate3.0,spring1.2,Web

package dao.impl;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.Transaction;

import vo.User;
import dao.BaseDAO;
import dao.IUserDAO;

public class UserDAO extends BaseDAO implements IUserDAO {

	public boolean deleteUser(int userid) {
		Session session =this.getSession();
		Transaction tran = session.beginTransaction();
		session.delete(getUser(userid));
		tran.commit();
		
	/*	if(session.createQuery("from User u where u.userid="+user.getUserid()).list().size()==0){
			session.close();
			return true;
		}
		else return false;*/
		
		return true;
	}

	@SuppressWarnings("unchecked")
	public List getAllUsers() {
		Session session = this.getSession();
		String hql = "from User";
		List users = session.createQuery(hql).list();
		return users;
	}
	
	public User getUser(int userid)
	{
		Session session=this.getSession();
		User user=(User) session.get(User.class, userid);
		session.close();
		return user;
	}

	public User saveUser(User user) {
		Session session = this.getSession();
		Transaction tran = session.beginTransaction();
		session.save(user);
		tran.commit();
		session.close();
		
		if(user.getUserid() != null){
			return user;
		}
		else return null;
	}

	public boolean updateUser(User user) {
		try{
			Session session=this.getSession();
			Transaction t=session.beginTransaction();
			session.update(user);
			t.commit();
			User after=(User)session.get(User.class, user.getUserid());
			session.close();
			if(after.equals(user))
			{
				return true;
			}
			}catch(Exception  e){}
			return false;
	}

}