Hibernate使用sql语句查询

import java.util.Iterator;

import java.util.List;

import java.util.Map;
import org.hibernate.Hibernate;

import org.hibernate.SQLQuery;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.transform.Transformers;
import com.hibernate.bean.SqlQueryBean;

import com.hibernate.bean.User;

import com.hibernate.util.HibernateUtil;

public class SqlQueryTest {
public static void main (String [] args){

sqlQueryAddScalar();

}

static void sqlQueryAddEntity(){
//获取Hibernate Session对象
Session session = HibernateUtil.getSession();
//开始事务
Transaction tx = session.beginTransaction();
//编写SQL语句
String sqlString = "select * from user";
//以SQL语句创建SQLQuery对象
List l = session.createSQLQuery(sqlString)
//将查询ss实体关联的User类
.addEntity("ss",User.class)
//返回全部的记录集
.list();
//遍历结果集
Iterator it = l.iterator();
while (it.hasNext()){
//因为将查询结果与Student类关联，因此返回的是Student集合
User s = (User)it.next();
String a = s.getName();

System.out.println(a);
}
//提交事务
tx.commit();
session.close();
}

static void sqlQueryAddScalar(){

//返回Object[]的遍历

Session session=HibernateUtil.getSession();

Transaction transaction=session.beginTransaction();

String sql="select * from user";

SQLQuery s=(SQLQuery) session.createSQLQuery(sql); //.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP)

s.addScalar("id",Hibernate.INTEGER); //列名, 数据类型

s.addScalar("name",Hibernate.STRING);

List list=s.list();

Object[] objects=(Object[])list.get(0);

System.out.println(objects[0]);

System.out.println(objects[1]);

//用MAP

SQLQuery ss=(SQLQuery) session.createSQLQuery(sql).setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);

ss.addScalar("id",Hibernate.INTEGER);

ss.addScalar("name",Hibernate.STRING);

List list2=ss.list();

Map map = (Map) list2.get(0);

System.out.println(map.get("name"));

System.out.println(map.get("id"));

//用LIST
SQLQuery s3=(SQLQuery) session.createSQLQuery(sql).setResultTransformer(Transformers.TO_LIST);

s3.addScalar("id",Hibernate.INTEGER);

s3.addScalar("name",Hibernate.STRING);

List list3=s3.list();

List list4=(List)list3.get(0);

System.out.println(list4.get(0));

System.out.println(list4.get(1));

//用自定义的bean

SQLQuery e=(SQLQuery) session.createSQLQuery(sql).setResultTransformer(Transformers.aliasToBean(SqlQueryBean.class));

e.addScalar("id",Hibernate.INTEGER);

e.addScalar("name",Hibernate.STRING);

List r=e.list();

SqlQueryBean sqb=(SqlQueryBean)r.get(0);

System.out.println(sqb.getId());

System.out.println(sqb.getName());

}

}