Hibernate工具类

package util;



import java.util.ArrayList;

import java.util.List;



import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

import org.hibernate.service.ServiceRegistry;

import org.hibernate.service.ServiceRegistryBuilder;



import entity.UserInfo;



public class HibernateUtil

{

  private static SessionFactory sessionFactory;

  

 /**

 * @return 获取会话工厂

 */

  public static SessionFactory getSessionFactory()

  {

    //第一步:读取Hibernate的配置文件  hibernamte.cfg.xml文件

    Configuration con=new Configuration().configure();

    //第二步:创建服务注册构建器对象，通过配置对象中加载所有的配置信息

    ServiceRegistryBuilder regbulider=new ServiceRegistryBuilder().applySettings(con.getProperties());

    //创建注册服务

    ServiceRegistry reg=regbulider.buildServiceRegistry();

    //第三步:创建会话工厂

    SessionFactory sessionFactory=con.buildSessionFactory(reg);

    return sessionFactory;

  }

  

 /**

 * @return 获取会话对象

 */

  public static Session getSession()

  {

     return getSessionFactory().openSession();

  }

  

  /**

 * @param obj 添加数据

 * @return

 */

  public static boolean add(Object obj)

  {

    Session session=null;

    Transaction tran=null;

    boolean result=false;

    try

    {

        session=getSession();

        tran=session.beginTransaction();

        session.save(obj);

        tran.commit();

        result=true;

    }

    catch (Exception e)

    {

       if(tran!=null)

       {

           //事物回滚

           tran.rollback();

       }

    }

    finally

    {

        if(session!=null)

        {

            //关闭session

            session.close();

        }

    }

    return result;

  }

  

  /**

 * @return 更新数据 

 * 参数为修改的主键id对象

 */

public static boolean update(Object object)

  {

        Session session=null;

        Transaction tran=null;

        boolean result=false;

        try

        {

            session=getSession();

            tran=session.beginTransaction();

            session.update(object);

            tran.commit();

            result=true;

        }

        catch (Exception e)

        {

           if(tran!=null)

           {

               //事物回滚

               tran.rollback();

           }

        }

        finally

        {

            if(session!=null)

            {

                //关闭session

                session.close();

            }

        }

        return result;

      }

     

  /**

 * @param c

 * @param obj  查询一条数据根据主键的id号

 * @return

 */

  public static Object get(Class c,int obj)

  {

        Session session=null;

        Object object=null;

        try

        {

            session=getSession();

            object=session.get(c,obj);

        }

        catch (Exception e)

        {

        }

        finally

        {

            if(session!=null)

            {

                //关闭session

                session.close();

            }

        }

        return object;

  }



  /**

 * @param obj

 * @return 删除数据

 */

public static boolean delete(Object obj)

  {

        Session session=null;

        Transaction tran=null;

        boolean result=false;

        try

        {

            session=getSession();

            tran=session.beginTransaction();

            session.delete(obj);

            tran.commit();

            result=true;

        }

        catch (Exception e)

        {

           if(tran!=null)

           {

               //事物回滚

               tran.rollback();

           }

        }

        finally

        {

            if(session!=null)

            {

                //关闭session

                session.close();

            }

        }

        return result;

  }





  /**

 * @param <T> 查询多条记录

 * @param sql  sql语句

 * @param param 参数数组

 * @return

 */

 @SuppressWarnings("unchecked")

public static <T> List<T> query(String sql,String[] param)

  {

      List<T> list=new ArrayList<T>();

      Session session=null;

       try

        {

            session=getSession();

            Query query=session.createQuery(sql);

            if(param!=null)

            {

                for(int i=0;i<param.length;i++)

                {

                    query.setString(i,param[i]);    

                }

            }

            list=query.list();

        }

        catch (Exception e)

        {

        }

        finally

        {

            if(session!=null)

            {

                session.close();

            }

        }

      return list;

  }

  /**

 * @param sql

 * @param param 查询单条记录

 * @return

 */

public static Object queryOne(String sql,String[] param)

  {

      Object object=null;

      Session session=null;

       try

        {

            session=getSession();

            Query query=session.createQuery(sql);

            if(param!=null)

            {

                for(int i=0;i<param.length;i++)

                {

                    query.setString(0,param[i]);    

                }

                object=query.uniqueResult();

            }

        }

        catch (Exception e)

        {

        }

        finally

        {

            if(session!=null)

            {

                session.close();

            }

        }

      return object;

  }

/**

 * @param <T>

 * @param sql

 * @param param

 * @param page

 * @param size

 * @return 实现分页查询

 */

@SuppressWarnings("unchecked")

public static <T> List<T> queryByPage(String sql,String[] param,int page,int size)

  {

      List<T> list=new ArrayList<T>();

      Session session=null;

       try

        {

            session=getSession();

            Query query=session.createQuery(sql);

            if(param!=null)

            {

                for(int i=0;i<param.length;i++)

                {

                    query.setString(i,param[i]);    

                }

            }

            //筛选条数

            query.setFirstResult((page-1)*size);

            query.setMaxResults(size);

            list=query.list();

        }

        catch (Exception e)

        {

        }

        finally

        {

            if(session!=null)

            {

                session.close();

            }

        }

      return list;

  }

/**

 * @param hql

 * @param pras

 * @return返回数据个数

 */

public static int getCount(String hql, String[] pras) {

    int resu = 0;

    Session s = null;

    try {

        s = getSession();

        Query q = s.createQuery(hql);

        if (pras != null) {

            for (int i = 0; i < pras.length; i++) {

                q.setString(i, pras[i]);

            }

        }

        resu = Integer.valueOf(q.iterate().next().toString());

    } catch (Exception e) {

        e.printStackTrace();

    } finally {

        if (s != null)

            s.close();

    }

    return resu;

}

 

}