hibernate使用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());
}
}