我想从数据库获取值,在我的情况下,我使用List从数据库中获取值,但是我收到此错误
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to id.co.bni.switcherservice.model.SwitcherServiceSource at id.co.bni.switcherservice.controller.SwitcherServiceController.LoadData(SwitcherServiceController.java:48) at id.co.bni.switcherservice.controller.SwitcherServiceController.main(SwitcherServiceController.java:62)
这是我的代码
Query LoadSource = session_source.createQuery("select CLIENT,SERVICE,SERVICE_TYPE,PROVIDER_CODE,COUNT(*) FROM SwitcherServiceSource" +
" where TIMESTAMP between :awal and :akhir" +
" and PROVIDER_CODE is not null group by CLIENT,PROVIDER_CODE order by CLIENT,PROVIDER_CODE");
LoadSource.setParameter("awal",fromDate);
LoadSource.setParameter("akhir",toDate);
List<SwitcherServiceSource> result_source = (List<SwitcherServiceSource>) LoadSource.list();
for(SwitcherServiceSource tes : result_source){
System.out.println(tes.getSERVICE());
}
任何帮助将是快乐:)
@raffian,你的意思是这样吗？
List<Switcher> result = (List<Switcher>) LoadSource.list();
for(Switcher tes : result){
System.out.println(tes.getSERVICE());
}
解决方法
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to id.co.bni.switcherservice.model.SwitcherServiceSource
问题是
(List<SwitcherServiceSource>) LoadSource.list();
这将返回一个对象数组列表(Object []),其中包含SwitcherServiceSource表中每列的标量值. Hibernate将使用ResultSetMetadata来推导返回的标量值的实际顺序和类型.
解
List<Object> result = (List<Object>) LoadSource.list();
Iterator itr = result.iterator();
while(itr.hasNext()){
Object[] obj = (Object[]) itr.next();
//now you have one array of Object for each row
String client = String.valueOf(obj[0]); // don't know the type of column CLIENT assuming String
Integer service = Integer.parseInt(String.valueOf(obj[1])); //SERVICE assumed as int
//same way for all obj[2],obj[3],obj[4]
}
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