Hibernate封装类

 最近研究Hibernate，写了一个对Hibernate数据访问的一个封装，现在贴出来，供大家分析讨论。

package com.lynn.db.dao;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class BaseDao {
	
	static Configuration conf = null;
	static SessionFactory factory = null;
	static Session session = null;
	static{
		try {
			conf = new Configuration().configure();
			factory = conf.buildSessionFactory();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 获得Session连接
	 * */
	public static Session getSession(){
		session = factory.openSession();
		return session;
	}
	/**
	 * 关闭session连接
	 * */
	public static void closeSession(){
		if(session!=null)
			session.close();
	}
	

}

下面是封装的增、删、改、查

package com.lynn.db.dao;

import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.FetchMode;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;

import com.lynn.page.PageInfo;


public class HibernateDao {
	
	protected Session session = null;
	protected Transaction ts = null;
	protected Criteria criteria;
	
	/**
	 * session保存方法
	 * */
	public boolean save(Object obj){
		boolean check = false;
		try {
			session = BaseDao.getSession();//获得连接
			ts = session.beginTransaction();//创建事务
			
			session.save(obj);//保存对象
			ts.commit();//提交事务
			check = true;
		} catch (Exception e) {
			e.printStackTrace();
			ts.rollback();//出现异常则回滚事务
		}
		return check;
	}
	/**
	 * session删除方法
	 * */
	public boolean  delete(Object obj){
		boolean check = false;
		try {
			session = BaseDao.getSession();
			ts = session.beginTransaction();
			session.delete(obj);
			ts.commit();
			check = true;
		} catch (Exception e) {
			e.printStackTrace();
			ts.rollback();
		}
		return check;
	}
	
	/**
	 * session修改方法
	 * */
	public boolean update(Object obj){
		boolean check = false;
		try {
			session = BaseDao.getSession();
			ts = session.beginTransaction();
			session.delete(obj);
			ts.commit();
			check = true;
		} catch (Exception e) {
			e.printStackTrace();
			ts.rollback();
		}
		return check;
	}
	/**
	 * session查询方法(抓取)查询所有
	 * @return Criteria
	 * */
	public Criteria QueryByFetch(String...fetch){
		
		try {
			
			if(fetch!=null && fetch.length>0){
				for (int i = 0; i < fetch.length; i++) {
					criteria = criteria.setFetchMode(fetch[i], FetchMode.JOIN);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return criteria; 
	}
	
	/**
	 * 根据单条件或者多条件查询
	 * 至少2个参数，第一个为属性名，第二个为属性值
	 * @return Criteria
	 * */
	public Criteria QueryByProperties(Object...properties){
		
		try {
			if(properties!=null && properties.length>0){
				for (int i = 0; i < properties.length; i=i+2) {
					criteria = criteria.add(Restrictions.like((String)properties[i], properties[i+1]));
				}
				
			}
			return criteria;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	/**
	 * 查询所有
	 * */
	public Criteria Query(Class c){
		session = BaseDao.getSession();
		criteria = session.createCriteria(c);
		return criteria;
	}
	/**
	 * 将查询结果返回List
	 * @return List
	 * */
	public List QueryList(){
		try {
			return criteria.list();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	/**
	 * 查询单个数据
	 * @return Object
	 * */
	public Object QueryUnique(){
		try {
			return criteria.uniqueResult();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	/**
	 * 此类专门用于分页
	 * */
	public Criteria QueryByPage(PageInfo pageInfo){
		
		 
		return criteria.setFirstResult((pageInfo.getPageIndex()-1)* pageInfo.getPageSize())
		.setMaxResults(pageInfo.getPageSize());
		
	}
	/**
	 * 此类专门用于排序
	 * */
	public Criteria QueryByOrder(Order o){
		return criteria.addOrder(o);
	}
	
}

最后

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