如何从Google数据存储区获取最新实体？

Question

I am trying to query entities from Google Datastore and would like to fetch the 10 newest entities based on their time created property, but I am unsure about the functionality of the addSort method.

Will the addSort method fetch the newest 10 entities if I sort on the timeCreated property and limit the results to 10, or will this just fetch the entities using the default order and sort those results?

Here is the Query using the addSort method:

   Query q1 = new Query("Person").addSort("timeCreated", SortDirection.DESCENDING);

Answer 1

排序顺序会影响为查询扫描的索引，因此查询（有限制）将返回最近的实体。