为什么使用索引值控制台输出为null
@Test
public void testSelectClauseReturnMay()
{
String hql = " select new map(s.name as name,s.tel as tel,s.address as address) from Seller s";
Query query = session.createQuery(hql);
List<Map> maps = query.list();
for(Map map : maps) {
System.out.println("name:"+map.get("0")
+", tel:"+map.get("1")
+", address:"+map.get("2"));
}
System.out.println("###########");
//以别名获取信息
for(Map map : maps) {
System.out.println("name:"+map.get("name")
+", tel:"+map.get("tel")
+", address:"+map.get("address"));
}
}
控制台输出：
name:null, tel:null, address:null
name:null, tel:null, address:null
name:null, tel:null, address:null
name:null, tel:null, address:null
###########
name:A服装店, tel:13000000000, address:中国北京××区
name:B数码店, tel:15800000000, address:中国浙江杭州市××区
name:C电器店, tel:13012341234, address:中国广东深圳市××区
name:D书店, tel:18600000000, address:中国陕西西安市××区为什么用别名就有数据输出了？求解！！
