AppEnginge JAVA SetOrdering 功能不起作用

Question

AppEnginge JAVA SetOrdering 功能不起作用

Messages.java

@PersistenceCapable
public class Messages{

@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;

@Persistent
String name;

@Persistent
String Comments;

@Persistent
Date addedDate;

查询是

Query query = pm.newQuery(Messages.class);
query.setOrdering("addedDate desc");
List<Messages> results = (List<Messages>) query.execute();

还添加了索引

<datastore-indexes autoGenerate="false">
<datastore-index kind="Messages" ancestor="true">
<property name="addedDate"  direction="desc" />
</datastore-index>

结果未按预期出现。按 addedDate 排序。结果随机数据未按 addedDate 排序请帮忙？

Answer 1

删除“消息”的索引定义。您无需为单个属性定义索引。

尝试不为消息定义索引。你应该得到正确的结果。