如何在 Google App Engine 的数据存储模型中获取行数?
问题描述：
我需要在 App Engine 上获取特定模型的记录计数.怎么做?
I need to get a count of records for a particular model on App Engine. How does one do it?
我批量上传了 4000 多条记录，但 modelname.count() 只显示了 1000 条.
I bulk uploaded more than 4000 records but modelname.count() only shows me 1000.
答
您应该使用 数据存储统计:
Query query = new Query("__Stat_Kind__");
query.addFilter("kind_name", FilterOperator.EQUAL, kind);
Entity entityStat = datastore.prepare(query).asSingleEntity();
Long totalEntities = (Long) entityStat.getProperty("count");
请注意，上述内容不适用于开发数据存储区，但可用于生产(发布时).
Please note that the above does not work on the development Datastore but it works in production (when published).
我看到这是一篇旧帖子，但我添加了一个答案，以帮助其他人搜索相同的内容.
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