Question

对数据存储使用OR或IN

这是我正在运行以获取实体的查询

- ./app-demo:/dockermount under volumes

但不支持SELECT * From Transactions Where __key__ = Key(Transactions,"00043b75-37f5-49c1-a104-4ebbe3f53a1atuzzin") OR __key__ = Key(Transactions,"c0f6a0ff-97b4-42a1-8a16-5473991834c8tuzzin")，OR错误

获得输出的最佳方式是什么？

实体元

IN

Answer 1

我们无法在OR中使用GQL作为per the docs。如果您知道密钥，则可以获取实体：

from google.cloud import datastore
import google.cloud.exceptions

def batch_lookup(client):

    keys = [
            client.key('Transactions', "00043b75-37f5-49c1-a104-4ebbe3f53a1atuzzin"),
            client.key('Transactions', "c0f6a0ff-97b4-42a1-8a16-5473991834c8tuzzin")
            ]

    result_set = []

    for i in range(len(keys)):
        key = keys[i]
        t = client.get(key)
        if t is not None:
            result_set.append(t)
            print(str(i + 1) + ": " + str(t))

    return result_set

datastore_client = datastore.Client()

batch_lookup(datastore_client)

此示例使用提到的代码段here

如何使用Or Condition在数据存储区中使用gql获取多个实体

1 个答案: