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);}}