Google App Engine错误：找不到匹配的索引。 （JAVA） [英] Google App Engine Error: No matching index found. (Java)

问题描述

我正在写一个查询，但它总是说找不到匹配的索引。我不知道为什么。我的代码如下：

I am writing a query but it always says "No matching index found". I don't know why. My code is as below:

Query query = pm.newQuery(Classified.class);
query.setFilter("emp_Id == emp");
query.setOrdering("upload_date desc");
query.declareParameters("String emp");
List<Classified> results = (List<Classified>)query.execute(session.getAttribute("emp_Id").toString()); 

---

---

<?xml version="1.0" encoding="utf-8"?>
<datastore-indexes autoGenerate="true">
  <datastore-index kind="Classified" ancestor="false">
    <property name="emp_Id" direction="asc" />
    <property name="category" direction="asc" />
    <property name="upload_date" direction="desc" />
  </datastore-index>
</datastore-indexes> 

我已经添加了上述索引，但没有帮助。

I have added the above index, but it did not help.

推荐答案

我相信您需要配置数据存储索引。您可能已经在Eclipse中为 WEB-INF / appengine-generated / datastore-indexes-auto.xml 生成了一个只需复制到 > WEB-INF / datastore-indexes.xml 并重新部署。

I believe you need to configure a Datastore Index. There's probably one already generated for you in Eclipse at WEB-INF/appengine-generated/datastore-indexes-auto.xml that you just need to copy to WEB-INF/datastore-indexes.xml and deploy again.

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