GAE Go数据存储区的大小

Question

Is there some function one can call to get the amount of entries in the GAE Go Datastore of an app, without querying it for the whole database and counting the output?

Answer 1

    c := appengine.NewContext(r)
    var result struct {
        Bytes int64 `datastore:"bytes"`
        Count int64 `datastore:"count"`
        Timestamp datastore.Time `datastore:"timestamp"`
    }
    datastore.NewQuery("__Stat_Total__").Run(c).Next(&result)
    c.Infof("count: %d", result.Count)