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我是 Google App Engine 的新手，我正在阅读此页面： https ://developers.google.com/appengine/docs/java/datastore/queries

在这里，他们解释了如何从 dataStore 中检索数据：

  // Get the Datastore Service
   DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();

      // The Query interface assembles a query
Query q = new Query("Person");

   //Use CompositeFilter to set more than one filter
    q.setFilter(CompositeFilterOperator.and(
 new FilterPredicate("lastName", Query.FilterOperator.EQUAL, lastNameParam),
 new FilterPredicate("height", Query.FilterOperator.LESS_THAN, maxHeightParam)));


    // PreparedQuery contains the methods for fetching query results
   // from the Datastore
    PreparedQuery pq = datastore.prepare(q);

  for (Entity result : pq.asIterable()) {
  String firstName = (String) result.getProperty("firstName");
   String lastName = (String) result.getProperty("lastName");
   Long height = (Long) result.getProperty("height");
   System.out.println(firstName + " " + lastName + ", " + height + " inches tall");
  }

但是如何保存这个 data.where 以及这个 firstName 和 LastName 是如何保存在 DataStore 中的？

谢谢

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1 回答 1

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您是否考虑阅读其他一些文档，例如链接在该文档上方的文档，该文档准确地解释了要做什么？

于 2012-09-05T08:45:55.460 回答