Native Sql - 原生SQL查詢Demo

package com.lc.nativesql.dao;

import java.sql.SQLException;
import java.util.List;

import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.junit.Test;

import com.lc.demo.hibernate.HibernateSessionFactory;



public class DemoDAO  {

	@Test
	public void query() throws SQLException
	{
		Session session = HibernateSessionFactory.getSession();

Method  one

                /**method one
		 * 用這個方法能夠直接把list集合中的對象直接轉換爲實體Bean,須要映射文件的存在
		 */
		  //原生態sql語句
//		    String sql = "select {p.*} from person_demo p";
		   /* String sql = "select p.age,p.name from person_demo p";
		    List<Demo> ls = session.createSQLQuery(sql).addEntity("p",Demo.class).list();*/
		    /**
		     * Hibernate Version 4.17
		     */
			/*String sql = "select * from person_demo";
			List<Demo> ls = session.createSQLQuery(sql).addEntity(Demo.class).list();*/
			
			
		 /*  if(ls.size()!=0)
		   {
			   for(int i=0;i<ls.size();i++)
			   {
				   Demo demo = (Demo)ls.get(i);
				   System.out.println(demo.getName());
				   System.out.println(demo.getAge());
			   }
		   }*/

Method two

/**
		 * method two
		 * hibernate3.2以上能夠對原生sql查詢使用ResultTransformer。
		 * 這會返回不受Hibernate管理的實體。
		 * 	            不須要映射文件的
		 * */
		/* List<Demo> ls =  session.createSQLQuery("select *  from person_demo")
	       .setResultTransformer(Transformers.aliasToBean(Demo.class)).list();
		 
		 if(ls.size()!=0)
		   {
			   for(int i=0;i<ls.size();i++)
			   {
				   Demo demo = (Demo)ls.get(i);
				   System.out.println(demo.getName());
				   System.out.println(demo.getAge());
			   }
		   }*/

Method three

/**
		    * method three
		    * 不須要映射文件
		    * 此處的name和age是表中的字段名稱
		    */
		   
		  String sql = "select *  from person_demo ";
		  List ls = session.createSQLQuery(sql).addScalar("name")
											   .addScalar("age").list();
			if(ls.size()!=0)
			{
				for(int i=0;i<ls.size();i++)
				{
					Object[] obj = (Object[])ls.get(i);
					for(int j=0;j<obj.length;j++)
					{
						
						System.out.println(obj[j].toString());
					}
				}
			}

}

}