Google 不同属性的数据存储查询和排序

Question

我正在尝试使用 Google 的数据存储 API (Java11) 对与用作过滤器的字段不同的字段上的数据进行排序。我收到以下错误

inequality filter property and first sort order must be the same

示例：数据：

Name: Toronto, Temperature: 30
Name: New York, Temperature: 70
Name: Montreal, Temperature: 10

数据存储区查询：

Query<Entity> query = Query.newEntityQueryBuilder()
        .setKind("Cities")
                .addOrderBy(OrderBy.asc("Name"))
        .setFilter(CompositeFilter.and(
            PropertyFilter.ge("Temperature", 30)))
        .build();

应与以下内容相同：

SELECT name,temperature FROM cities WHERE temperature >= '30' ORDER BY name;

有没有办法在 Datastore 中执行如此简单的查询？

Answer 1

不，你必须自己求助。如 https://cloud.google.com/datastore/docs/concepts/queries#sort_orders:

的注释框中所述

"Note: Because of the way Datastore mode executes queries, if a query specifies inequality filters on a property and sort orders on other properties, the property used in the inequality filters must be ordered before the other properties."

Google 不同属性的数据存储查询和排序

Google Datastore Query and Sort on different properties

java

nosql

google-cloud-datastore