本文介绍了在Java中使用App Engine数据存储低级API的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

如何使用低级API在App Engine数据存储库中找到实体类型中的条目总数?



我有一个函数或过滤器来查询此目的?



我正在使用Java来执行此操作。

解决方案

Engine有一个用于以编程方式获取数据存储区统计信息的API:

  DatastoreService datastore = DatastoreServiceFactory.getDatastoreService(); 
Entity globalStat = datastore.prepare(new Query(__ Stat_Total __))。asSingleEntity();
Long totalBytes =(Long)globalStat.getProperty(bytes);
Long totalEntities =(Long)globalStat.getProperty(count)

请参阅文档: https://cloud.google.com/appengine/docs/java/datastore/您可以使用 __ Stat_Kind __


来获取某种实体

How to find the total number of entries in an entity type in App Engine Datastore using Low Level API?

I there a function or filter to query for this purpose?

I am using Java to implement this.

解决方案

App Engine has an API for getting datastore statistics programmatically:

DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Entity globalStat = datastore.prepare(new Query("__Stat_Total__")).asSingleEntity();
Long totalBytes = (Long) globalStat.getProperty("bytes");
Long totalEntities = (Long) globalStat.getProperty("count")

See the documentation: https://cloud.google.com/appengine/docs/java/datastore/stats

You can get entities of a kind using __Stat_Kind__

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10-28 21:38