hibernate使用原生SQL查询

以下是Demo测试Hibernate 原生SQL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());
  }
 
}

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