我想从数据库中获取值,在我的例子中,我使用 List
从数据库中获取值,但是我得到了这个错误
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,SERVICE,SERVICE_TYPE,PROVIDER_CODE order by CLIENT,SERVICE,SERVICE_TYPE,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());
}
任何帮助都会很高兴:)
@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());
}
最佳答案
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 Object 数组 (Object[]) 列表,其中包含 SwitcherServiceSource
表中每一列的标量值。 Hibernate 将使用 ResultSetMetadata 推导出返回的标量值的实际顺序和类型。
解决方案
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]
}
相关链接
关于java - [Ljava.lang.Object;不能转换为,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20486641/